Isolating libyul library API into its own namespace `yul`.

105 files changed, 366 insertions, 582 deletions

diff --git a/libsolidity/analysis/ReferencesResolver.cpp b/libsolidity/analysis/ReferencesResolver.cpp
index 1593c3e0..c4931d98 100644
--- a/libsolidity/analysis/ReferencesResolver.cpp
+++ b/libsolidity/analysis/ReferencesResolver.cpp
@@ -273,7 +273,7 @@ bool ReferencesResolver::visit(InlineAssembly const& _inlineAssembly)
 	ErrorList errors;
 	ErrorReporter errorsIgnored(errors);
 	yul::ExternalIdentifierAccess::Resolver resolver =
-	[&](assembly::Identifier const& _identifier, yul::IdentifierContext, bool _crossesFunctionBoundary) {
+	[&](yul::Identifier const& _identifier, yul::IdentifierContext, bool _crossesFunctionBoundary) {
 		auto declarations = m_resolver.nameFromCurrentScope(_identifier.name.str());
 		bool isSlot = boost::algorithm::ends_with(_identifier.name.str(), "_slot");
 		bool isOffset = boost::algorithm::ends_with(_identifier.name.str(), "_offset");
@@ -314,9 +314,9 @@ bool ReferencesResolver::visit(InlineAssembly const& _inlineAssembly)
 
 	// Will be re-generated later with correct information
 	// We use the latest EVM version because we will re-run it anyway.
-	assembly::AsmAnalysisInfo analysisInfo;
+	yul::AsmAnalysisInfo analysisInfo;
 	boost::optional<Error::Type> errorTypeForLoose = Error::Type::SyntaxError;
-	assembly::AsmAnalyzer(analysisInfo, errorsIgnored, EVMVersion(), errorTypeForLoose, assembly::AsmFlavour::Loose, resolver).analyze(_inlineAssembly.operations());
+	yul::AsmAnalyzer(analysisInfo, errorsIgnored, EVMVersion(), errorTypeForLoose, yul::AsmFlavour::Loose, resolver).analyze(_inlineAssembly.operations());
 	return false;
 }
 
diff --git a/libsolidity/analysis/TypeChecker.cpp b/libsolidity/analysis/TypeChecker.cpp
index 3cf4d79f..4e63875b 100644
--- a/libsolidity/analysis/TypeChecker.cpp
+++ b/libsolidity/analysis/TypeChecker.cpp
@@ -954,7 +954,7 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
 	// External references have already been resolved in a prior stage and stored in the annotation.
 	// We run the resolve step again regardless.
 	yul::ExternalIdentifierAccess::Resolver identifierAccess = [&](
-		assembly::Identifier const& _identifier,
+		yul::Identifier const& _identifier,
 		yul::IdentifierContext _context,
 		bool
 	)
@@ -1039,13 +1039,13 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
 		return size_t(1);
 	};
 	solAssert(!_inlineAssembly.annotation().analysisInfo, "");
-	_inlineAssembly.annotation().analysisInfo = make_shared<assembly::AsmAnalysisInfo>();
-	assembly::AsmAnalyzer analyzer(
+	_inlineAssembly.annotation().analysisInfo = make_shared<yul::AsmAnalysisInfo>();
+	yul::AsmAnalyzer analyzer(
 		*_inlineAssembly.annotation().analysisInfo,
 		m_errorReporter,
 		m_evmVersion,
 		Error::Type::SyntaxError,
-		assembly::AsmFlavour::Loose,
+		yul::AsmFlavour::Loose,
 		identifierAccess
 	);
 	if (!analyzer.analyze(_inlineAssembly.operations()))
diff --git a/libsolidity/analysis/ViewPureChecker.cpp b/libsolidity/analysis/ViewPureChecker.cpp
index 7839ecd3..1112d682 100644
--- a/libsolidity/analysis/ViewPureChecker.cpp
+++ b/libsolidity/analysis/ViewPureChecker.cpp
@@ -40,48 +40,48 @@ public:
 	explicit AssemblyViewPureChecker(std::function<void(StateMutability, SourceLocation const&)> _reportMutability):
 		m_reportMutability(_reportMutability) {}
 
-	void operator()(assembly::Label const&) { }
-	void operator()(assembly::Instruction const& _instruction)
+	void operator()(yul::Label const&) { }
+	void operator()(yul::Instruction const& _instruction)
 	{
 		checkInstruction(_instruction.location, _instruction.instruction);
 	}
-	void operator()(assembly::Literal const&) {}
-	void operator()(assembly::Identifier const&) {}
-	void operator()(assembly::FunctionalInstruction const& _instr)
+	void operator()(yul::Literal const&) {}
+	void operator()(yul::Identifier const&) {}
+	void operator()(yul::FunctionalInstruction const& _instr)
 	{
 		checkInstruction(_instr.location, _instr.instruction);
 		for (auto const& arg: _instr.arguments)
 			boost::apply_visitor(*this, arg);
 	}
-	void operator()(assembly::ExpressionStatement const& _expr)
+	void operator()(yul::ExpressionStatement const& _expr)
 	{
 		boost::apply_visitor(*this, _expr.expression);
 	}
-	void operator()(assembly::StackAssignment const&) {}
-	void operator()(assembly::Assignment const& _assignment)
+	void operator()(yul::StackAssignment const&) {}
+	void operator()(yul::Assignment const& _assignment)
 	{
 		boost::apply_visitor(*this, *_assignment.value);
 	}
-	void operator()(assembly::VariableDeclaration const& _varDecl)
+	void operator()(yul::VariableDeclaration const& _varDecl)
 	{
 		if (_varDecl.value)
 			boost::apply_visitor(*this, *_varDecl.value);
 	}
-	void operator()(assembly::FunctionDefinition const& _funDef)
+	void operator()(yul::FunctionDefinition const& _funDef)
 	{
 		(*this)(_funDef.body);
 	}
-	void operator()(assembly::FunctionCall const& _funCall)
+	void operator()(yul::FunctionCall const& _funCall)
 	{
 		for (auto const& arg: _funCall.arguments)
 			boost::apply_visitor(*this, arg);
 	}
-	void operator()(assembly::If const& _if)
+	void operator()(yul::If const& _if)
 	{
 		boost::apply_visitor(*this, *_if.condition);
 		(*this)(_if.body);
 	}
-	void operator()(assembly::Switch const& _switch)
+	void operator()(yul::Switch const& _switch)
 	{
 		boost::apply_visitor(*this, *_switch.expression);
 		for (auto const& _case: _switch.cases)
@@ -91,14 +91,14 @@ public:
 			(*this)(_case.body);
 		}
 	}
-	void operator()(assembly::ForLoop const& _for)
+	void operator()(yul::ForLoop const& _for)
 	{
 		(*this)(_for.pre);
 		boost::apply_visitor(*this, *_for.condition);
 		(*this)(_for.body);
 		(*this)(_for.post);
 	}
-	void operator()(assembly::Block const& _block)
+	void operator()(yul::Block const& _block)
 	{
 		for (auto const& s: _block.statements)
 			boost::apply_visitor(*this, s);
diff --git a/libsolidity/ast/AST.h b/libsolidity/ast/AST.h
index d23562ad..2f418b09 100644
--- a/libsolidity/ast/AST.h
+++ b/libsolidity/ast/AST.h
@@ -41,6 +41,12 @@
 #include <vector>
 #include <memory>
 
+namespace yul
+{
+// Forward-declaration to <yul/AsmData.h>
+struct Block;
+}
+
 namespace dev
 {
 namespace solidity
@@ -1028,12 +1034,6 @@ public:
 	StatementAnnotation& annotation() const override;
 };
 
-namespace assembly
-{
-// Forward-declaration to AsmData.h
-struct Block;
-}
-
 /**
  * Inline assembly.
  */
@@ -1043,18 +1043,18 @@ public:
 	InlineAssembly(
 		SourceLocation const& _location,
 		ASTPointer<ASTString> const& _docString,
-		std::shared_ptr<assembly::Block> const& _operations
+		std::shared_ptr<yul::Block> const& _operations
 	):
 		Statement(_location, _docString), m_operations(_operations) {}
 	void accept(ASTVisitor& _visitor) override;
 	void accept(ASTConstVisitor& _visitor) const override;
 
-	assembly::Block const& operations() const { return *m_operations; }
+	yul::Block const& operations() const { return *m_operations; }
 
 	InlineAssemblyAnnotation& annotation() const override;
 
 private:
-	std::shared_ptr<assembly::Block> m_operations;
+	std::shared_ptr<yul::Block> m_operations;
 };
 
 /**
diff --git a/libsolidity/ast/ASTAnnotations.h b/libsolidity/ast/ASTAnnotations.h
index e0b3f492..e9cc905e 100644
--- a/libsolidity/ast/ASTAnnotations.h
+++ b/libsolidity/ast/ASTAnnotations.h
@@ -30,6 +30,12 @@
 #include <vector>
 #include <set>
 
+namespace yul
+{
+	struct AsmAnalysisInfo;
+	struct Identifier;
+}
+
 namespace dev
 {
 namespace solidity
@@ -120,12 +126,6 @@ struct StatementAnnotation: ASTAnnotation, DocumentedAnnotation
 {
 };
 
-namespace assembly
-{
-	struct AsmAnalysisInfo;
-	struct Identifier;
-}
-
 struct InlineAssemblyAnnotation: StatementAnnotation
 {
 	struct ExternalIdentifierInfo
@@ -137,9 +137,9 @@ struct InlineAssemblyAnnotation: StatementAnnotation
 	};
 
 	/// Mapping containing resolved references to external identifiers and their value size
-	std::map<assembly::Identifier const*, ExternalIdentifierInfo> externalReferences;
+	std::map<yul::Identifier const*, ExternalIdentifierInfo> externalReferences;
 	/// Information generated during analysis phase.
-	std::shared_ptr<assembly::AsmAnalysisInfo> analysisInfo;
+	std::shared_ptr<yul::AsmAnalysisInfo> analysisInfo;
 };
 
 struct ReturnAnnotation: StatementAnnotation
diff --git a/libsolidity/ast/ASTJsonConverter.cpp b/libsolidity/ast/ASTJsonConverter.cpp
index bd6deb6e..b9054692 100644
--- a/libsolidity/ast/ASTJsonConverter.cpp
+++ b/libsolidity/ast/ASTJsonConverter.cpp
@@ -172,7 +172,7 @@ void ASTJsonConverter::appendExpressionAttributes(
 	_attributes += exprAttributes;
 }
 
-Json::Value ASTJsonConverter::inlineAssemblyIdentifierToJson(pair<assembly::Identifier const* ,InlineAssemblyAnnotation::ExternalIdentifierInfo> _info) const
+Json::Value ASTJsonConverter::inlineAssemblyIdentifierToJson(pair<yul::Identifier const* ,InlineAssemblyAnnotation::ExternalIdentifierInfo> _info) const
 {
 	Json::Value tuple(Json::objectValue);
 	tuple["src"] = sourceLocationToString(_info.first->location);
@@ -465,7 +465,7 @@ bool ASTJsonConverter::visit(InlineAssembly const& _node)
 		}
 	}
 	setJsonNode(_node, "InlineAssembly", {
-		make_pair("operations", Json::Value(assembly::AsmPrinter()(_node.operations()))),
+		make_pair("operations", Json::Value(yul::AsmPrinter()(_node.operations()))),
 		make_pair("externalReferences", std::move(externalReferences))
 	});
 	return false;
diff --git a/libsolidity/ast/ASTJsonConverter.h b/libsolidity/ast/ASTJsonConverter.h
index dec3ac96..ef0a217a 100644
--- a/libsolidity/ast/ASTJsonConverter.h
+++ b/libsolidity/ast/ASTJsonConverter.h
@@ -135,7 +135,7 @@ private:
 	{
 		return _node ? toJson(*_node) : Json::nullValue;
 	}
-	Json::Value inlineAssemblyIdentifierToJson(std::pair<assembly::Identifier const* , InlineAssemblyAnnotation::ExternalIdentifierInfo> _info) const;
+	Json::Value inlineAssemblyIdentifierToJson(std::pair<yul::Identifier const* , InlineAssemblyAnnotation::ExternalIdentifierInfo> _info) const;
 	static std::string location(VariableDeclaration::Location _location);
 	static std::string contractKind(ContractDefinition::ContractKind _kind);
 	static std::string functionCallKind(FunctionCallKind _kind);
diff --git a/libsolidity/codegen/CompilerContext.cpp b/libsolidity/codegen/CompilerContext.cpp
index 32be521c..d1bf29fc 100644
--- a/libsolidity/codegen/CompilerContext.cpp
+++ b/libsolidity/codegen/CompilerContext.cpp
@@ -323,7 +323,7 @@ void CompilerContext::appendInlineAssembly(
 
 	yul::ExternalIdentifierAccess identifierAccess;
 	identifierAccess.resolve = [&](
-		assembly::Identifier const& _identifier,
+		yul::Identifier const& _identifier,
 		yul::IdentifierContext,
 		bool
 	)
@@ -332,7 +332,7 @@ void CompilerContext::appendInlineAssembly(
 		return it == _localVariables.end() ? size_t(-1) : 1;
 	};
 	identifierAccess.generateCode = [&](
-		assembly::Identifier const& _identifier,
+		yul::Identifier const& _identifier,
 		yul::IdentifierContext _context,
 		yul::AbstractAssembly& _assembly
 	)
@@ -361,19 +361,19 @@ void CompilerContext::appendInlineAssembly(
 	ErrorList errors;
 	ErrorReporter errorReporter(errors);
 	auto scanner = make_shared<langutil::Scanner>(langutil::CharStream(_assembly), "--CODEGEN--");
-	auto parserResult = assembly::Parser(errorReporter, assembly::AsmFlavour::Strict).parse(scanner, false);
+	auto parserResult = yul::Parser(errorReporter, yul::AsmFlavour::Strict).parse(scanner, false);
 #ifdef SOL_OUTPUT_ASM
-	cout << assembly::AsmPrinter()(*parserResult) << endl;
+	cout << yul::AsmPrinter()(*parserResult) << endl;
 #endif
-	assembly::AsmAnalysisInfo analysisInfo;
+	yul::AsmAnalysisInfo analysisInfo;
 	bool analyzerResult = false;
 	if (parserResult)
-		analyzerResult = assembly::AsmAnalyzer(
+		analyzerResult = yul::AsmAnalyzer(
 			analysisInfo,
 			errorReporter,
 			m_evmVersion,
 			boost::none,
-			assembly::AsmFlavour::Strict,
+			yul::AsmFlavour::Strict,
 			identifierAccess.resolve
 		).analyze(*parserResult);
 	if (!parserResult || !errorReporter.errors().empty() || !analyzerResult)
@@ -395,7 +395,7 @@ void CompilerContext::appendInlineAssembly(
 	}
 
 	solAssert(errorReporter.errors().empty(), "Failed to analyze inline assembly block.");
-	assembly::CodeGenerator::assemble(*parserResult, analysisInfo, *m_asm, identifierAccess, _system);
+	yul::CodeGenerator::assemble(*parserResult, analysisInfo, *m_asm, identifierAccess, _system);
 
 	// Reset the source location to the one of the node (instead of the CODEGEN source location)
 	updateSourceLocation();
diff --git a/libsolidity/codegen/ContractCompiler.cpp b/libsolidity/codegen/ContractCompiler.cpp
index 815c2a4f..157d5fa7 100644
--- a/libsolidity/codegen/ContractCompiler.cpp
+++ b/libsolidity/codegen/ContractCompiler.cpp
@@ -496,14 +496,14 @@ bool ContractCompiler::visit(InlineAssembly const& _inlineAssembly)
 {
 	unsigned startStackHeight = m_context.stackHeight();
 	yul::ExternalIdentifierAccess identifierAccess;
-	identifierAccess.resolve = [&](assembly::Identifier const& _identifier, yul::IdentifierContext, bool)
+	identifierAccess.resolve = [&](yul::Identifier const& _identifier, yul::IdentifierContext, bool)
 	{
 		auto ref = _inlineAssembly.annotation().externalReferences.find(&_identifier);
 		if (ref == _inlineAssembly.annotation().externalReferences.end())
 			return size_t(-1);
 		return ref->second.valueSize;
 	};
-	identifierAccess.generateCode = [&](assembly::Identifier const& _identifier, yul::IdentifierContext _context, yul::AbstractAssembly& _assembly)
+	identifierAccess.generateCode = [&](yul::Identifier const& _identifier, yul::IdentifierContext _context, yul::AbstractAssembly& _assembly)
 	{
 		auto ref = _inlineAssembly.annotation().externalReferences.find(&_identifier);
 		solAssert(ref != _inlineAssembly.annotation().externalReferences.end(), "");
@@ -615,7 +615,7 @@ bool ContractCompiler::visit(InlineAssembly const& _inlineAssembly)
 		}
 	};
 	solAssert(_inlineAssembly.annotation().analysisInfo, "");
-	assembly::CodeGenerator::assemble(
+	yul::CodeGenerator::assemble(
 		_inlineAssembly.operations(),
 		*_inlineAssembly.annotation().analysisInfo,
 		m_context.nonConstAssembly(),
diff --git a/libsolidity/interface/AssemblyStack.cpp b/libsolidity/interface/AssemblyStack.cpp
index cd8b125e..31959d93 100644
--- a/libsolidity/interface/AssemblyStack.cpp
+++ b/libsolidity/interface/AssemblyStack.cpp
@@ -40,19 +40,19 @@ using namespace dev::solidity;
 
 namespace
 {
-assembly::AsmFlavour languageToAsmFlavour(AssemblyStack::Language _language)
+yul::AsmFlavour languageToAsmFlavour(AssemblyStack::Language _language)
 {
 	switch (_language)
 	{
 	case AssemblyStack::Language::Assembly:
-		return assembly::AsmFlavour::Loose;
+		return yul::AsmFlavour::Loose;
 	case AssemblyStack::Language::StrictAssembly:
-		return assembly::AsmFlavour::Strict;
+		return yul::AsmFlavour::Strict;
 	case AssemblyStack::Language::Yul:
-		return assembly::AsmFlavour::Yul;
+		return yul::AsmFlavour::Yul;
 	}
 	solAssert(false, "");
-	return assembly::AsmFlavour::Yul;
+	return yul::AsmFlavour::Yul;
 }
 
 }
@@ -69,7 +69,7 @@ bool AssemblyStack::parseAndAnalyze(std::string const& _sourceName, std::string
 	m_errors.clear();
 	m_analysisSuccessful = false;
 	m_scanner = make_shared<Scanner>(CharStream(_source), _sourceName);
-	m_parserResult = assembly::Parser(m_errorReporter, languageToAsmFlavour(m_language)).parse(m_scanner, false);
+	m_parserResult = yul::Parser(m_errorReporter, languageToAsmFlavour(m_language)).parse(m_scanner, false);
 	if (!m_errorReporter.errors().empty())
 		return false;
 	solAssert(m_parserResult, "");
@@ -77,21 +77,21 @@ bool AssemblyStack::parseAndAnalyze(std::string const& _sourceName, std::string
 	return analyzeParsed();
 }
 
-bool AssemblyStack::analyze(assembly::Block const& _block, Scanner const* _scanner)
+bool AssemblyStack::analyze(yul::Block const& _block, Scanner const* _scanner)
 {
 	m_errors.clear();
 	m_analysisSuccessful = false;
 	if (_scanner)
 		m_scanner = make_shared<Scanner>(*_scanner);
-	m_parserResult = make_shared<assembly::Block>(_block);
+	m_parserResult = make_shared<yul::Block>(_block);
 
 	return analyzeParsed();
 }
 
 bool AssemblyStack::analyzeParsed()
 {
-	m_analysisInfo = make_shared<assembly::AsmAnalysisInfo>();
-	assembly::AsmAnalyzer analyzer(*m_analysisInfo, m_errorReporter, m_evmVersion, boost::none, languageToAsmFlavour(m_language));
+	m_analysisInfo = make_shared<yul::AsmAnalysisInfo>();
+	yul::AsmAnalyzer analyzer(*m_analysisInfo, m_errorReporter, m_evmVersion, boost::none, languageToAsmFlavour(m_language));
 	m_analysisSuccessful = analyzer.analyze(*m_parserResult);
 	return m_analysisSuccessful;
 }
@@ -108,7 +108,7 @@ MachineAssemblyObject AssemblyStack::assemble(Machine _machine) const
 	{
 		MachineAssemblyObject object;
 		eth::Assembly assembly;
-		assembly::CodeGenerator::assemble(*m_parserResult, *m_analysisInfo, assembly);
+		yul::CodeGenerator::assemble(*m_parserResult, *m_analysisInfo, assembly);
 		object.bytecode = make_shared<eth::LinkerObject>(assembly.assemble());
 		object.assembly = assembly.assemblyString();
 		return object;
@@ -132,5 +132,5 @@ MachineAssemblyObject AssemblyStack::assemble(Machine _machine) const
 string AssemblyStack::print() const
 {
 	solAssert(m_parserResult, "");
-	return assembly::AsmPrinter(m_language == Language::Yul)(*m_parserResult);
+	return yul::AsmPrinter(m_language == Language::Yul)(*m_parserResult);
 }
diff --git a/libsolidity/interface/AssemblyStack.h b/libsolidity/interface/AssemblyStack.h
index d6ee33cf..03b811db 100644
--- a/libsolidity/interface/AssemblyStack.h
+++ b/libsolidity/interface/AssemblyStack.h
@@ -34,16 +34,17 @@ namespace langutil
 class Scanner;
 }
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 struct AsmAnalysisInfo;
 struct Block;
 }
 
+namespace dev
+{
+namespace solidity
+{
+
 struct MachineAssemblyObject
 {
 	std::shared_ptr<eth::LinkerObject> bytecode;
@@ -73,7 +74,7 @@ public:
 
 	/// Runs analysis step on the supplied block, returns false if input cannot be assembled.
 	/// Multiple calls overwrite the previous state.
-	bool analyze(assembly::Block const& _block, langutil::Scanner const* _scanner = nullptr);
+	bool analyze(yul::Block const& _block, langutil::Scanner const* _scanner = nullptr);
 
 	/// Run the assembly step (should only be called after parseAndAnalyze).
 	MachineAssemblyObject assemble(Machine _machine) const;
@@ -93,8 +94,8 @@ private:
 	std::shared_ptr<langutil::Scanner> m_scanner;
 
 	bool m_analysisSuccessful = false;
-	std::shared_ptr<assembly::Block> m_parserResult;
-	std::shared_ptr<assembly::AsmAnalysisInfo> m_analysisInfo;
+	std::shared_ptr<yul::Block> m_parserResult;
+	std::shared_ptr<yul::AsmAnalysisInfo> m_analysisInfo;
 	langutil::ErrorList m_errors;
 	langutil::ErrorReporter m_errorReporter;
 };
diff --git a/libsolidity/parsing/Parser.cpp b/libsolidity/parsing/Parser.cpp
index 560d8e8b..ffe2be83 100644
--- a/libsolidity/parsing/Parser.cpp
+++ b/libsolidity/parsing/Parser.cpp
@@ -1012,8 +1012,8 @@ ASTPointer<InlineAssembly> Parser::parseInlineAssembly(ASTPointer<ASTString> con
 		m_scanner->next();
 	}
 
-	assembly::Parser asmParser(m_errorReporter);
-	shared_ptr<assembly::Block> block = asmParser.parse(m_scanner, true);
+	yul::Parser asmParser(m_errorReporter);
+	shared_ptr<yul::Block> block = asmParser.parse(m_scanner, true);
 	nodeFactory.markEndPosition();
 	return nodeFactory.createNode<InlineAssembly>(_docString, block);
 }
diff --git a/libyul/ASTDataForward.h b/libyul/ASTDataForward.h
index 16dc7411..dffe1c74 100644
--- a/libyul/ASTDataForward.h
+++ b/libyul/ASTDataForward.h
@@ -23,33 +23,3 @@
 
 #include <libyul/AsmDataForward.h>
 
-namespace dev
-{
-namespace yul
-{
-
-using Instruction = solidity::assembly::Instruction;
-using Literal = solidity::assembly::Literal;
-using Label = solidity::assembly::Label;
-using StackAssignment = solidity::assembly::StackAssignment;
-using Identifier = solidity::assembly::Identifier;
-using Assignment = solidity::assembly::Assignment;
-using VariableDeclaration = solidity::assembly::VariableDeclaration;
-using FunctionalInstruction = solidity::assembly::FunctionalInstruction;
-using FunctionDefinition = solidity::assembly::FunctionDefinition;
-using FunctionCall = solidity::assembly::FunctionCall;
-using If = solidity::assembly::If;
-using Case = solidity::assembly::Case;
-using Switch = solidity::assembly::Switch;
-using ForLoop = solidity::assembly::ForLoop;
-using ExpressionStatement = solidity::assembly::ExpressionStatement;
-using Block = solidity::assembly::Block;
-
-using TypedName = solidity::assembly::TypedName;
-class YulString;
-
-using Expression = boost::variant<FunctionalInstruction, FunctionCall, Identifier, Literal>;
-using Statement = boost::variant<ExpressionStatement, Instruction, Label, StackAssignment, Assignment, VariableDeclaration, FunctionDefinition, If, Switch, ForLoop, Block>;
-
-}
-}
diff --git a/libyul/AsmAnalysis.cpp b/libyul/AsmAnalysis.cpp
index 34c5fbb6..d3f6de84 100644
--- a/libyul/AsmAnalysis.cpp
+++ b/libyul/AsmAnalysis.cpp
@@ -36,8 +36,9 @@
 using namespace std;
 using namespace dev;
 using namespace langutil;
+using namespace yul;
+using namespace dev;
 using namespace dev::solidity;
-using namespace dev::solidity::assembly;
 
 namespace {
 
@@ -65,7 +66,7 @@ bool AsmAnalyzer::operator()(Label const& _label)
 	return true;
 }
 
-bool AsmAnalyzer::operator()(assembly::Instruction const& _instruction)
+bool AsmAnalyzer::operator()(yul::Instruction const& _instruction)
 {
 	checkLooseFeature(
 		_instruction.location,
@@ -78,11 +79,11 @@ bool AsmAnalyzer::operator()(assembly::Instruction const& _instruction)
 	return true;
 }
 
-bool AsmAnalyzer::operator()(assembly::Literal const& _literal)
+bool AsmAnalyzer::operator()(Literal const& _literal)
 {
 	expectValidType(_literal.type.str(), _literal.location);
 	++m_stackHeight;
-	if (_literal.kind == assembly::LiteralKind::String && _literal.value.str().size() > 32)
+	if (_literal.kind == LiteralKind::String && _literal.value.str().size() > 32)
 	{
 		m_errorReporter.typeError(
 			_literal.location,
@@ -90,7 +91,7 @@ bool AsmAnalyzer::operator()(assembly::Literal const& _literal)
 		);
 		return false;
 	}
-	else if (_literal.kind == assembly::LiteralKind::Number && bigint(_literal.value.str()) > u256(-1))
+	else if (_literal.kind == LiteralKind::Number && bigint(_literal.value.str()) > u256(-1))
 	{
 		m_errorReporter.typeError(
 			_literal.location,
@@ -98,7 +99,7 @@ bool AsmAnalyzer::operator()(assembly::Literal const& _literal)
 		);
 		return false;
 	}
-	else if (_literal.kind == assembly::LiteralKind::Boolean)
+	else if (_literal.kind == LiteralKind::Boolean)
 	{
 		solAssert(m_flavour == AsmFlavour::Yul, "");
 		solAssert(_literal.value == YulString{string("true")} || _literal.value == YulString{string("false")}, "");
@@ -107,7 +108,7 @@ bool AsmAnalyzer::operator()(assembly::Literal const& _literal)
 	return true;
 }
 
-bool AsmAnalyzer::operator()(assembly::Identifier const& _identifier)
+bool AsmAnalyzer::operator()(Identifier const& _identifier)
 {
 	solAssert(!_identifier.name.empty(), "");
 	size_t numErrorsBefore = m_errorReporter.errors().size();
@@ -177,7 +178,7 @@ bool AsmAnalyzer::operator()(FunctionalInstruction const& _instr)
 	return success;
 }
 
-bool AsmAnalyzer::operator()(assembly::ExpressionStatement const& _statement)
+bool AsmAnalyzer::operator()(ExpressionStatement const& _statement)
 {
 	int initialStackHeight = m_stackHeight;
 	bool success = boost::apply_visitor(*this, _statement.expression);
@@ -198,7 +199,7 @@ bool AsmAnalyzer::operator()(assembly::ExpressionStatement const& _statement)
 	return success;
 }
 
-bool AsmAnalyzer::operator()(assembly::StackAssignment const& _assignment)
+bool AsmAnalyzer::operator()(StackAssignment const& _assignment)
 {
 	checkLooseFeature(
 		_assignment.location,
@@ -209,7 +210,7 @@ bool AsmAnalyzer::operator()(assembly::StackAssignment const& _assignment)
 	return success;
 }
 
-bool AsmAnalyzer::operator()(assembly::Assignment const& _assignment)
+bool AsmAnalyzer::operator()(Assignment const& _assignment)
 {
 	solAssert(_assignment.value, "");
 	int const expectedItems = _assignment.variableNames.size();
@@ -235,7 +236,7 @@ bool AsmAnalyzer::operator()(assembly::Assignment const& _assignment)
 	return success;
 }
 
-bool AsmAnalyzer::operator()(assembly::VariableDeclaration const& _varDecl)
+bool AsmAnalyzer::operator()(VariableDeclaration const& _varDecl)
 {
 	bool success = true;
 	int const numVariables = _varDecl.variables.size();
@@ -261,7 +262,7 @@ bool AsmAnalyzer::operator()(assembly::VariableDeclaration const& _varDecl)
 	return success;
 }
 
-bool AsmAnalyzer::operator()(assembly::FunctionDefinition const& _funDef)
+bool AsmAnalyzer::operator()(FunctionDefinition const& _funDef)
 {
 	solAssert(!_funDef.name.empty(), "");
 	Block const* virtualBlock = m_info.virtualBlocks.at(&_funDef).get();
@@ -283,7 +284,7 @@ bool AsmAnalyzer::operator()(assembly::FunctionDefinition const& _funDef)
 	return success;
 }
 
-bool AsmAnalyzer::operator()(assembly::FunctionCall const& _funCall)
+bool AsmAnalyzer::operator()(FunctionCall const& _funCall)
 {
 	solAssert(!_funCall.functionName.name.empty(), "");
 	bool success = true;
@@ -397,7 +398,7 @@ bool AsmAnalyzer::operator()(Switch const& _switch)
 	return success;
 }
 
-bool AsmAnalyzer::operator()(assembly::ForLoop const& _for)
+bool AsmAnalyzer::operator()(ForLoop const& _for)
 {
 	solAssert(_for.condition, "");
 
@@ -486,7 +487,7 @@ bool AsmAnalyzer::expectDeposit(int _deposit, int _oldHeight, SourceLocation con
 	return true;
 }
 
-bool AsmAnalyzer::checkAssignment(assembly::Identifier const& _variable, size_t _valueSize)
+bool AsmAnalyzer::checkAssignment(Identifier const& _variable, size_t _valueSize)
 {
 	solAssert(!_variable.name.empty(), "");
 	bool success = true;
diff --git a/libyul/AsmAnalysis.h b/libyul/AsmAnalysis.h
index edca5b50..34e32eb0 100644
--- a/libyul/AsmAnalysis.h
+++ b/libyul/AsmAnalysis.h
@@ -41,11 +41,7 @@ class ErrorReporter;
 struct SourceLocation;
 }
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 
 struct AsmAnalysisInfo;
@@ -61,10 +57,10 @@ public:
 	explicit AsmAnalyzer(
 		AsmAnalysisInfo& _analysisInfo,
 		langutil::ErrorReporter& _errorReporter,
-		EVMVersion _evmVersion,
+		dev::solidity::EVMVersion _evmVersion,
 		boost::optional<langutil::Error::Type> _errorTypeForLoose,
 		AsmFlavour _flavour = AsmFlavour::Loose,
-		yul::ExternalIdentifierAccess::Resolver const& _resolver = yul::ExternalIdentifierAccess::Resolver()
+		ExternalIdentifierAccess::Resolver const& _resolver = ExternalIdentifierAccess::Resolver()
 	):
 		m_resolver(_resolver),
 		m_info(_analysisInfo),
@@ -74,23 +70,23 @@ public:
 		m_errorTypeForLoose(_errorTypeForLoose)
 	{}
 
-	bool analyze(assembly::Block const& _block);
-
-	bool operator()(assembly::Instruction const&);
-	bool operator()(assembly::Literal const& _literal);
-	bool operator()(assembly::Identifier const&);
-	bool operator()(assembly::FunctionalInstruction const& _functionalInstruction);
-	bool operator()(assembly::Label const& _label);
-	bool operator()(assembly::ExpressionStatement const&);
-	bool operator()(assembly::StackAssignment const&);
-	bool operator()(assembly::Assignment const& _assignment);
-	bool operator()(assembly::VariableDeclaration const& _variableDeclaration);
-	bool operator()(assembly::FunctionDefinition const& _functionDefinition);
-	bool operator()(assembly::FunctionCall const& _functionCall);
-	bool operator()(assembly::If const& _if);
-	bool operator()(assembly::Switch const& _switch);
-	bool operator()(assembly::ForLoop const& _forLoop);
-	bool operator()(assembly::Block const& _block);
+	bool analyze(Block const& _block);
+
+	bool operator()(Instruction const&);
+	bool operator()(Literal const& _literal);
+	bool operator()(Identifier const&);
+	bool operator()(FunctionalInstruction const& _functionalInstruction);
+	bool operator()(Label const& _label);
+	bool operator()(ExpressionStatement const&);
+	bool operator()(StackAssignment const&);
+	bool operator()(Assignment const& _assignment);
+	bool operator()(VariableDeclaration const& _variableDeclaration);
+	bool operator()(FunctionDefinition const& _functionDefinition);
+	bool operator()(FunctionCall const& _functionCall);
+	bool operator()(If const& _if);
+	bool operator()(Switch const& _switch);
+	bool operator()(ForLoop const& _forLoop);
+	bool operator()(Block const& _block);
 
 private:
 	/// Visits the statement and expects it to deposit one item onto the stack.
@@ -99,11 +95,11 @@ private:
 
 	/// Verifies that a variable to be assigned to exists and has the same size
 	/// as the value, @a _valueSize, unless that is equal to -1.
-	bool checkAssignment(assembly::Identifier const& _assignment, size_t _valueSize = size_t(-1));
+	bool checkAssignment(Identifier const& _assignment, size_t _valueSize = size_t(-1));
 
-	Scope& scope(assembly::Block const* _block);
+	Scope& scope(Block const* _block);
 	void expectValidType(std::string const& type, langutil::SourceLocation const& _location);
-	void warnOnInstructions(solidity::Instruction _instr, langutil::SourceLocation const& _location);
+	void warnOnInstructions(dev::solidity::Instruction _instr, langutil::SourceLocation const& _location);
 
 	/// Depending on @a m_flavour and @a m_errorTypeForLoose, throws an internal compiler
 	/// exception (if the flavour is not Loose), reports an error/warning
@@ -118,11 +114,9 @@ private:
 	std::set<Scope::Variable const*> m_activeVariables;
 	AsmAnalysisInfo& m_info;
 	langutil::ErrorReporter& m_errorReporter;
-	EVMVersion m_evmVersion;
+	dev::solidity::EVMVersion m_evmVersion;
 	AsmFlavour m_flavour = AsmFlavour::Loose;
 	boost::optional<langutil::Error::Type> m_errorTypeForLoose;
 };
 
 }
-}
-}
diff --git a/libyul/AsmAnalysisInfo.h b/libyul/AsmAnalysisInfo.h
index 372ff3ed..08a35ade 100644
--- a/libyul/AsmAnalysisInfo.h
+++ b/libyul/AsmAnalysisInfo.h
@@ -28,11 +28,7 @@
 #include <memory>
 #include <vector>
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 
 struct Scope;
@@ -40,13 +36,11 @@ struct Scope;
 struct AsmAnalysisInfo
 {
 	using StackHeightInfo = std::map<void const*, int>;
-	using Scopes = std::map<assembly::Block const*, std::shared_ptr<Scope>>;
+	using Scopes = std::map<Block const*, std::shared_ptr<Scope>>;
 	Scopes scopes;
 	StackHeightInfo stackHeightInfo;
 	/// Virtual blocks which will be used for scopes for function arguments and return values.
-	std::map<FunctionDefinition const*, std::shared_ptr<assembly::Block const>> virtualBlocks;
+	std::map<FunctionDefinition const*, std::shared_ptr<Block const>> virtualBlocks;
 };
 
 }
-}
-}
diff --git a/libyul/AsmCodeGen.cpp b/libyul/AsmCodeGen.cpp
index 5bc2fee3..23bf395d 100644
--- a/libyul/AsmCodeGen.cpp
+++ b/libyul/AsmCodeGen.cpp
@@ -48,10 +48,10 @@
 using namespace std;
 using namespace dev;
 using namespace langutil;
+using namespace yul;
 using namespace dev::solidity;
-using namespace dev::solidity::assembly;
 
-class EthAssemblyAdapter: public yul::AbstractAssembly
+class EthAssemblyAdapter: public AbstractAssembly
 {
 public:
 	explicit EthAssemblyAdapter(eth::Assembly& _assembly):
@@ -143,16 +143,16 @@ private:
 	eth::Assembly& m_assembly;
 };
 
-void assembly::CodeGenerator::assemble(
+void CodeGenerator::assemble(
 	Block const& _parsedData,
 	AsmAnalysisInfo& _analysisInfo,
 	eth::Assembly& _assembly,
-	yul::ExternalIdentifierAccess const& _identifierAccess,
+	ExternalIdentifierAccess const& _identifierAccess,
 	bool _useNamedLabelsForFunctions
 )
 {
 	EthAssemblyAdapter assemblyAdapter(_assembly);
-	yul::CodeTransform(
+	CodeTransform(
 		assemblyAdapter,
 		_analysisInfo,
 		false,
diff --git a/libyul/AsmCodeGen.h b/libyul/AsmCodeGen.h
index e5e53c0d..fd5ac0a1 100644
--- a/libyul/AsmCodeGen.h
+++ b/libyul/AsmCodeGen.h
@@ -32,9 +32,9 @@ namespace eth
 {
 class Assembly;
 }
-namespace solidity
-{
-namespace assembly
+}
+
+namespace yul
 {
 struct Block;
 
@@ -45,12 +45,10 @@ public:
 	static void assemble(
 		Block const& _parsedData,
 		AsmAnalysisInfo& _analysisInfo,
-		eth::Assembly& _assembly,
+		dev::eth::Assembly& _assembly,
 		yul::ExternalIdentifierAccess const& _identifierAccess = yul::ExternalIdentifierAccess(),
 		bool _useNamedLabelsForFunctions = false
 	);
 };
 
 }
-}
-}
diff --git a/libyul/AsmData.h b/libyul/AsmData.h
index 6979d29c..86c373a4 100644
--- a/libyul/AsmData.h
+++ b/libyul/AsmData.h
@@ -23,7 +23,6 @@
 #pragma once
 
 #include <libyul/AsmDataForward.h>
-
 #include <libyul/YulString.h>
 
 #include <libevmasm/Instruction.h>
@@ -35,21 +34,16 @@
 #include <map>
 #include <memory>
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 
-using YulString = dev::yul::YulString;
 using Type = YulString;
 
 struct TypedName { langutil::SourceLocation location; YulString name; Type type; };
 using TypedNameList = std::vector<TypedName>;
 
 /// Direct EVM instruction (except PUSHi and JUMPDEST)
-struct Instruction { langutil::SourceLocation location; solidity::Instruction instruction; };
+struct Instruction { langutil::SourceLocation location; dev::solidity::Instruction instruction; };
 /// Literal number or string (up to 32 bytes)
 enum class LiteralKind { Number, Boolean, String };
 struct Literal { langutil::SourceLocation location; LiteralKind kind; YulString value; Type type; };
@@ -67,7 +61,7 @@ struct StackAssignment { langutil::SourceLocation location; Identifier variableN
 /// the same amount of items as the number of variables.
 struct Assignment { langutil::SourceLocation location; std::vector<Identifier> variableNames; std::shared_ptr<Expression> value; };
 /// Functional instruction, e.g. "mul(mload(20:u256), add(2:u256, x))"
-struct FunctionalInstruction { langutil::SourceLocation location; solidity::Instruction instruction; std::vector<Expression> arguments; };
+struct FunctionalInstruction { langutil::SourceLocation location; dev::solidity::Instruction instruction; std::vector<Expression> arguments; };
 struct FunctionCall { langutil::SourceLocation location; Identifier functionName; std::vector<Expression> arguments; };
 /// Statement that contains only a single expression
 struct ExpressionStatement { langutil::SourceLocation location; Expression expression; };
@@ -100,5 +94,3 @@ template <class T> inline langutil::SourceLocation locationOf(T const& _node)
 }
 
 }
-}
-}
diff --git a/libyul/AsmDataForward.h b/libyul/AsmDataForward.h
index 69cf8f1d..046c8248 100644
--- a/libyul/AsmDataForward.h
+++ b/libyul/AsmDataForward.h
@@ -24,11 +24,7 @@
 
 #include <boost/variant.hpp>
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 
 struct Instruction;
@@ -61,5 +57,3 @@ enum class AsmFlavour
 };
 
 }
-}
-}
diff --git a/libyul/AsmParser.cpp b/libyul/AsmParser.cpp
index 0d3bc32f..2ce94f85 100644
--- a/libyul/AsmParser.cpp
+++ b/libyul/AsmParser.cpp
@@ -32,10 +32,10 @@
 using namespace std;
 using namespace dev;
 using namespace langutil;
+using namespace yul;
 using namespace dev::solidity;
-using namespace dev::solidity::assembly;
 
-shared_ptr<assembly::Block> Parser::parse(std::shared_ptr<Scanner> const& _scanner, bool _reuseScanner)
+shared_ptr<Block> Parser::parse(std::shared_ptr<Scanner> const& _scanner, bool _reuseScanner)
 {
 	m_recursionDepth = 0;
 	try
@@ -54,10 +54,10 @@ shared_ptr<assembly::Block> Parser::parse(std::shared_ptr<Scanner> const& _scann
 	return nullptr;
 }
 
-assembly::Block Parser::parseBlock()
+Block Parser::parseBlock()
 {
 	RecursionGuard recursionGuard(*this);
-	assembly::Block block = createWithLocation<Block>();
+	Block block = createWithLocation<Block>();
 	expectToken(Token::LBrace);
 	while (currentToken() != Token::RBrace)
 		block.statements.emplace_back(parseStatement());
@@ -66,7 +66,7 @@ assembly::Block Parser::parseBlock()
 	return block;
 }
 
-assembly::Statement Parser::parseStatement()
+Statement Parser::parseStatement()
 {
 	RecursionGuard recursionGuard(*this);
 	switch (currentToken())
@@ -79,7 +79,7 @@ assembly::Statement Parser::parseStatement()
 		return parseBlock();
 	case Token::If:
 	{
-		assembly::If _if = createWithLocation<assembly::If>();
+		If _if = createWithLocation<If>();
 		m_scanner->next();
 		_if.condition = make_shared<Expression>(parseExpression());
 		_if.body = parseBlock();
@@ -87,7 +87,7 @@ assembly::Statement Parser::parseStatement()
 	}
 	case Token::Switch:
 	{
-		assembly::Switch _switch = createWithLocation<assembly::Switch>();
+		Switch _switch = createWithLocation<Switch>();
 		m_scanner->next();
 		_switch.expression = make_shared<Expression>(parseExpression());
 		while (m_scanner->currentToken() == Token::Case)
@@ -109,7 +109,7 @@ assembly::Statement Parser::parseStatement()
 	{
 		if (m_flavour != AsmFlavour::Loose)
 			break;
-		assembly::StackAssignment assignment = createWithLocation<assembly::StackAssignment>();
+		StackAssignment assignment = createWithLocation<StackAssignment>();
 		advance();
 		expectToken(Token::Colon);
 		assignment.variableName.location = location();
@@ -139,9 +139,9 @@ assembly::Statement Parser::parseStatement()
 	{
 		// if a comma follows, a multiple assignment is assumed
 
-		if (elementary.type() != typeid(assembly::Identifier))
+		if (elementary.type() != typeid(Identifier))
 			fatalParserError("Label name / variable name must precede \",\" (multiple assignment).");
-		assembly::Identifier const& identifier = boost::get<assembly::Identifier>(elementary);
+		Identifier const& identifier = boost::get<Identifier>(elementary);
 
 		Assignment assignment = createWithLocation<Assignment>(identifier.location);
 		assignment.variableNames.emplace_back(identifier);
@@ -150,9 +150,9 @@ assembly::Statement Parser::parseStatement()
 		{
 			expectToken(Token::Comma);
 			elementary = parseElementaryOperation();
-			if (elementary.type() != typeid(assembly::Identifier))
+			if (elementary.type() != typeid(Identifier))
 				fatalParserError("Variable name expected in multiple assignment.");
-			assignment.variableNames.emplace_back(boost::get<assembly::Identifier>(elementary));
+			assignment.variableNames.emplace_back(boost::get<Identifier>(elementary));
 		}
 		while (currentToken() == Token::Comma);
 
@@ -165,15 +165,15 @@ assembly::Statement Parser::parseStatement()
 	}
 	case Token::Colon:
 	{
-		if (elementary.type() != typeid(assembly::Identifier))
+		if (elementary.type() != typeid(Identifier))
 			fatalParserError("Label name / variable name must precede \":\".");
-		assembly::Identifier const& identifier = boost::get<assembly::Identifier>(elementary);
+		Identifier const& identifier = boost::get<Identifier>(elementary);
 		advance();
 		// identifier:=: should be parsed as identifier: =: (i.e. a label),
 		// while identifier:= (being followed by a non-colon) as identifier := (assignment).
 		if (currentToken() == Token::Assign && peekNextToken() != Token::Colon)
 		{
-			assembly::Assignment assignment = createWithLocation<assembly::Assignment>(identifier.location);
+			Assignment assignment = createWithLocation<Assignment>(identifier.location);
 			if (m_flavour != AsmFlavour::Yul && instructions().count(identifier.name.str()))
 				fatalParserError("Cannot use instruction names for identifier names.");
 			advance();
@@ -197,36 +197,36 @@ assembly::Statement Parser::parseStatement()
 			fatalParserError("Call or assignment expected.");
 		break;
 	}
-	if (elementary.type() == typeid(assembly::Identifier))
+	if (elementary.type() == typeid(Identifier))
 	{
-		Expression expr = boost::get<assembly::Identifier>(elementary);
+		Expression expr = boost::get<Identifier>(elementary);
 		return ExpressionStatement{locationOf(expr), expr};
 	}
-	else if (elementary.type() == typeid(assembly::Literal))
+	else if (elementary.type() == typeid(Literal))
 	{
-		Expression expr = boost::get<assembly::Literal>(elementary);
+		Expression expr = boost::get<Literal>(elementary);
 		return ExpressionStatement{locationOf(expr), expr};
 	}
 	else
 	{
-		solAssert(elementary.type() == typeid(assembly::Instruction), "Invalid elementary operation.");
-		return boost::get<assembly::Instruction>(elementary);
+		solAssert(elementary.type() == typeid(Instruction), "Invalid elementary operation.");
+		return boost::get<Instruction>(elementary);
 	}
 }
 
-assembly::Case Parser::parseCase()
+Case Parser::parseCase()
 {
 	RecursionGuard recursionGuard(*this);
-	assembly::Case _case = createWithLocation<assembly::Case>();
+	Case _case = createWithLocation<Case>();
 	if (m_scanner->currentToken() == Token::Default)
 		m_scanner->next();
 	else if (m_scanner->currentToken() == Token::Case)
 	{
 		m_scanner->next();
 		ElementaryOperation literal = parseElementaryOperation();
-		if (literal.type() != typeid(assembly::Literal))
+		if (literal.type() != typeid(Literal))
 			fatalParserError("Literal expected.");
-		_case.value = make_shared<Literal>(boost::get<assembly::Literal>(std::move(literal)));
+		_case.value = make_shared<Literal>(boost::get<Literal>(std::move(literal)));
 	}
 	else
 		fatalParserError("Case or default case expected.");
@@ -235,7 +235,7 @@ assembly::Case Parser::parseCase()
 	return _case;
 }
 
-assembly::ForLoop Parser::parseForLoop()
+ForLoop Parser::parseForLoop()
 {
 	RecursionGuard recursionGuard(*this);
 	ForLoop forLoop = createWithLocation<ForLoop>();
@@ -248,7 +248,7 @@ assembly::ForLoop Parser::parseForLoop()
 	return forLoop;
 }
 
-assembly::Expression Parser::parseExpression()
+Expression Parser::parseExpression()
 {
 	RecursionGuard recursionGuard(*this);
 	// In strict mode, this might parse a plain Instruction, but
@@ -293,12 +293,12 @@ assembly::Expression Parser::parseExpression()
 		Instruction& instr = boost::get<Instruction>(operation);
 		return FunctionalInstruction{std::move(instr.location), instr.instruction, {}};
 	}
-	else if (operation.type() == typeid(assembly::Identifier))
-		return boost::get<assembly::Identifier>(operation);
+	else if (operation.type() == typeid(Identifier))
+		return boost::get<Identifier>(operation);
 	else
 	{
-		solAssert(operation.type() == typeid(assembly::Literal), "");
-		return boost::get<assembly::Literal>(operation);
+		solAssert(operation.type() == typeid(Literal), "");
+		return boost::get<Literal>(operation);
 	}
 }
 
@@ -420,7 +420,7 @@ Parser::ElementaryOperation Parser::parseElementaryOperation()
 	return ret;
 }
 
-assembly::VariableDeclaration Parser::parseVariableDeclaration()
+VariableDeclaration Parser::parseVariableDeclaration()
 {
 	RecursionGuard recursionGuard(*this);
 	VariableDeclaration varDecl = createWithLocation<VariableDeclaration>();
@@ -445,7 +445,7 @@ assembly::VariableDeclaration Parser::parseVariableDeclaration()
 	return varDecl;
 }
 
-assembly::FunctionDefinition Parser::parseFunctionDefinition()
+FunctionDefinition Parser::parseFunctionDefinition()
 {
 	RecursionGuard recursionGuard(*this);
 	FunctionDefinition funDef = createWithLocation<FunctionDefinition>();
@@ -477,7 +477,7 @@ assembly::FunctionDefinition Parser::parseFunctionDefinition()
 	return funDef;
 }
 
-assembly::Expression Parser::parseCall(Parser::ElementaryOperation&& _initialOp)
+Expression Parser::parseCall(Parser::ElementaryOperation&& _initialOp)
 {
 	RecursionGuard recursionGuard(*this);
 	if (_initialOp.type() == typeid(Instruction))
diff --git a/libyul/AsmParser.h b/libyul/AsmParser.h
index 874b4d6d..cea3b667 100644
--- a/libyul/AsmParser.h
+++ b/libyul/AsmParser.h
@@ -29,11 +29,7 @@
 #include <liblangutil/Scanner.h>
 #include <liblangutil/ParserBase.h>
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 
 class Parser: public langutil::ParserBase
@@ -48,7 +44,7 @@ public:
 	std::shared_ptr<Block> parse(std::shared_ptr<langutil::Scanner> const& _scanner, bool _reuseScanner);
 
 protected:
-	using ElementaryOperation = boost::variant<assembly::Instruction, assembly::Literal, assembly::Identifier>;
+	using ElementaryOperation = boost::variant<Instruction, Literal, Identifier>;
 
 	/// Creates an inline assembly node with the given source location.
 	template <class T> T createWithLocation(langutil::SourceLocation const& _loc = {}) const
@@ -71,7 +67,7 @@ protected:
 	Case parseCase();
 	ForLoop parseForLoop();
 	/// Parses a functional expression that has to push exactly one stack element
-	assembly::Expression parseExpression();
+	Expression parseExpression();
 	static std::map<std::string, dev::solidity::Instruction> const& instructions();
 	static std::map<dev::solidity::Instruction, std::string> const& instructionNames();
 	/// Parses an elementary operation, i.e. a literal, identifier or instruction.
@@ -80,7 +76,7 @@ protected:
 	ElementaryOperation parseElementaryOperation();
 	VariableDeclaration parseVariableDeclaration();
 	FunctionDefinition parseFunctionDefinition();
-	assembly::Expression parseCall(ElementaryOperation&& _initialOp);
+	Expression parseCall(ElementaryOperation&& _initialOp);
 	TypedName parseTypedName();
 	std::string expectAsmIdentifier();
 
@@ -91,5 +87,3 @@ private:
 };
 
 }
-}
-}
diff --git a/libyul/AsmPrinter.cpp b/libyul/AsmPrinter.cpp
index 49e2f33b..eaaba9f3 100644
--- a/libyul/AsmPrinter.cpp
+++ b/libyul/AsmPrinter.cpp
@@ -35,19 +35,19 @@
 
 using namespace std;
 using namespace dev;
+using namespace yul;
 using namespace dev::solidity;
-using namespace dev::solidity::assembly;
 
 //@TODO source locations
 
-string AsmPrinter::operator()(assembly::Instruction const& _instruction)
+string AsmPrinter::operator()(yul::Instruction const& _instruction)
 {
 	solAssert(!m_yul, "");
 	solAssert(isValidInstruction(_instruction.instruction), "Invalid instruction");
 	return boost::to_lower_copy(instructionInfo(_instruction.instruction).name);
 }
 
-string AsmPrinter::operator()(assembly::Literal const& _literal)
+string AsmPrinter::operator()(Literal const& _literal)
 {
 	switch (_literal.kind)
 	{
@@ -90,13 +90,13 @@ string AsmPrinter::operator()(assembly::Literal const& _literal)
 	return "\"" + out + "\"" + appendTypeName(_literal.type);
 }
 
-string AsmPrinter::operator()(assembly::Identifier const& _identifier)
+string AsmPrinter::operator()(Identifier const& _identifier)
 {
 	solAssert(!_identifier.name.empty(), "Invalid identifier.");
 	return _identifier.name.str();
 }
 
-string AsmPrinter::operator()(assembly::FunctionalInstruction const& _functionalInstruction)
+string AsmPrinter::operator()(FunctionalInstruction const& _functionalInstruction)
 {
 	solAssert(!m_yul, "");
 	solAssert(isValidInstruction(_functionalInstruction.instruction), "Invalid instruction");
@@ -114,21 +114,21 @@ string AsmPrinter::operator()(ExpressionStatement const& _statement)
 	return boost::apply_visitor(*this, _statement.expression);
 }
 
-string AsmPrinter::operator()(assembly::Label const& _label)
+string AsmPrinter::operator()(Label const& _label)
 {
 	solAssert(!m_yul, "");
 	solAssert(!_label.name.empty(), "Invalid label.");
 	return _label.name.str() + ":";
 }
 
-string AsmPrinter::operator()(assembly::StackAssignment const& _assignment)
+string AsmPrinter::operator()(StackAssignment const& _assignment)
 {
 	solAssert(!m_yul, "");
 	solAssert(!_assignment.variableName.name.empty(), "Invalid variable name.");
 	return "=: " + (*this)(_assignment.variableName);
 }
 
-string AsmPrinter::operator()(assembly::Assignment const& _assignment)
+string AsmPrinter::operator()(Assignment const& _assignment)
 {
 	solAssert(_assignment.variableNames.size() >= 1, "");
 	string variables = (*this)(_assignment.variableNames.front());
@@ -137,7 +137,7 @@ string AsmPrinter::operator()(assembly::Assignment const& _assignment)
 	return variables + " := " + boost::apply_visitor(*this, *_assignment.value);
 }
 
-string AsmPrinter::operator()(assembly::VariableDeclaration const& _variableDeclaration)
+string AsmPrinter::operator()(VariableDeclaration const& _variableDeclaration)
 {
 	string out = "let ";
 	out += boost::algorithm::join(
@@ -154,7 +154,7 @@ string AsmPrinter::operator()(assembly::VariableDeclaration const& _variableDecl
 	return out;
 }
 
-string AsmPrinter::operator()(assembly::FunctionDefinition const& _functionDefinition)
+string AsmPrinter::operator()(FunctionDefinition const& _functionDefinition)
 {
 	solAssert(!_functionDefinition.name.empty(), "Invalid function name.");
 	string out = "function " + _functionDefinition.name.str() + "(";
@@ -179,7 +179,7 @@ string AsmPrinter::operator()(assembly::FunctionDefinition const& _functionDefin
 	return out + "\n" + (*this)(_functionDefinition.body);
 }
 
-string AsmPrinter::operator()(assembly::FunctionCall const& _functionCall)
+string AsmPrinter::operator()(FunctionCall const& _functionCall)
 {
 	return
 		(*this)(_functionCall.functionName) + "(" +
@@ -210,7 +210,7 @@ string AsmPrinter::operator()(Switch const& _switch)
 	return out;
 }
 
-string AsmPrinter::operator()(assembly::ForLoop const& _forLoop)
+string AsmPrinter::operator()(ForLoop const& _forLoop)
 {
 	solAssert(_forLoop.condition, "Invalid for loop condition.");
 	string out = "for ";
diff --git a/libyul/AsmPrinter.h b/libyul/AsmPrinter.h
index ab0c9a08..61dfc18c 100644
--- a/libyul/AsmPrinter.h
+++ b/libyul/AsmPrinter.h
@@ -28,11 +28,7 @@
 
 #include <boost/variant.hpp>
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 
 class AsmPrinter: public boost::static_visitor<std::string>
@@ -40,29 +36,27 @@ class AsmPrinter: public boost::static_visitor<std::string>
 public:
 	explicit AsmPrinter(bool _yul = false): m_yul(_yul) {}
 
-	std::string operator()(assembly::Instruction const& _instruction);
-	std::string operator()(assembly::Literal const& _literal);
-	std::string operator()(assembly::Identifier const& _identifier);
-	std::string operator()(assembly::FunctionalInstruction const& _functionalInstruction);
-	std::string operator()(assembly::ExpressionStatement const& _expr);
-	std::string operator()(assembly::Label const& _label);
-	std::string operator()(assembly::StackAssignment const& _assignment);
-	std::string operator()(assembly::Assignment const& _assignment);
-	std::string operator()(assembly::VariableDeclaration const& _variableDeclaration);
-	std::string operator()(assembly::FunctionDefinition const& _functionDefinition);
-	std::string operator()(assembly::FunctionCall const& _functionCall);
-	std::string operator()(assembly::If const& _if);
-	std::string operator()(assembly::Switch const& _switch);
-	std::string operator()(assembly::ForLoop const& _forLoop);
-	std::string operator()(assembly::Block const& _block);
+	std::string operator()(Instruction const& _instruction);
+	std::string operator()(Literal const& _literal);
+	std::string operator()(Identifier const& _identifier);
+	std::string operator()(FunctionalInstruction const& _functionalInstruction);
+	std::string operator()(ExpressionStatement const& _expr);
+	std::string operator()(Label const& _label);
+	std::string operator()(StackAssignment const& _assignment);
+	std::string operator()(Assignment const& _assignment);
+	std::string operator()(VariableDeclaration const& _variableDeclaration);
+	std::string operator()(FunctionDefinition const& _functionDefinition);
+	std::string operator()(FunctionCall const& _functionCall);
+	std::string operator()(If const& _if);
+	std::string operator()(Switch const& _switch);
+	std::string operator()(ForLoop const& _forLoop);
+	std::string operator()(Block const& _block);
 
 private:
 	std::string formatTypedName(TypedName _variable) const;
-	std::string appendTypeName(yul::YulString _type) const;
+	std::string appendTypeName(YulString _type) const;
 
 	bool m_yul = false;
 };
 
 }
-}
-}
diff --git a/libyul/AsmScope.cpp b/libyul/AsmScope.cpp
index 0d7aca57..b71f2367 100644
--- a/libyul/AsmScope.cpp
+++ b/libyul/AsmScope.cpp
@@ -22,9 +22,9 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::solidity::assembly;
+using namespace yul;
 
-bool Scope::registerLabel(yul::YulString _name)
+bool Scope::registerLabel(YulString _name)
 {
 	if (exists(_name))
 		return false;
@@ -32,7 +32,7 @@ bool Scope::registerLabel(yul::YulString _name)
 	return true;
 }
 
-bool Scope::registerVariable(yul::YulString _name, YulType const& _type)
+bool Scope::registerVariable(YulString _name, YulType const& _type)
 {
 	if (exists(_name))
 		return false;
@@ -42,7 +42,7 @@ bool Scope::registerVariable(yul::YulString _name, YulType const& _type)
 	return true;
 }
 
-bool Scope::registerFunction(yul::YulString _name, std::vector<YulType> const& _arguments, std::vector<YulType> const& _returns)
+bool Scope::registerFunction(YulString _name, std::vector<YulType> const& _arguments, std::vector<YulType> const& _returns)
 {
 	if (exists(_name))
 		return false;
@@ -50,7 +50,7 @@ bool Scope::registerFunction(yul::YulString _name, std::vector<YulType> const& _
 	return true;
 }
 
-Scope::Identifier* Scope::lookup(yul::YulString _name)
+Scope::Identifier* Scope::lookup(YulString _name)
 {
 	bool crossedFunctionBoundary = false;
 	for (Scope* s = this; s; s = s->superScope)
@@ -70,7 +70,7 @@ Scope::Identifier* Scope::lookup(yul::YulString _name)
 	return nullptr;
 }
 
-bool Scope::exists(yul::YulString _name) const
+bool Scope::exists(YulString _name) const
 {
 	if (identifiers.count(_name))
 		return true;
diff --git a/libyul/AsmScope.h b/libyul/AsmScope.h
index 12c05716..2a8ef49e 100644
--- a/libyul/AsmScope.h
+++ b/libyul/AsmScope.h
@@ -32,16 +32,12 @@
 #include <functional>
 #include <memory>
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 
 struct Scope
 {
-	using YulType = yul::YulString;
+	using YulType = YulString;
 	using LabelID = size_t;
 
 	struct Variable { YulType type; };
@@ -53,13 +49,13 @@ struct Scope
 	};
 
 	using Identifier = boost::variant<Variable, Label, Function>;
-	using Visitor = GenericVisitor<Variable const, Label const, Function const>;
-	using NonconstVisitor = GenericVisitor<Variable, Label, Function>;
+	using Visitor = dev::GenericVisitor<Variable const, Label const, Function const>;
+	using NonconstVisitor = dev::GenericVisitor<Variable, Label, Function>;
 
-	bool registerVariable(yul::YulString _name, YulType const& _type);
-	bool registerLabel(yul::YulString _name);
+	bool registerVariable(YulString _name, YulType const& _type);
+	bool registerLabel(YulString _name);
 	bool registerFunction(
-		yul::YulString _name,
+		YulString _name,
 		std::vector<YulType> const& _arguments,
 		std::vector<YulType> const& _returns
 	);
@@ -69,12 +65,12 @@ struct Scope
 	/// will any lookups across assembly boundaries.
 	/// The pointer will be invalidated if the scope is modified.
 	/// @param _crossedFunction if true, we already crossed a function boundary during recursive lookup
-	Identifier* lookup(yul::YulString _name);
+	Identifier* lookup(YulString _name);
 	/// Looks up the identifier in this and super scopes (will not find variables across function
 	/// boundaries and generally stops at assembly boundaries) and calls the visitor, returns
 	/// false if not found.
 	template <class V>
-	bool lookup(yul::YulString _name, V const& _visitor)
+	bool lookup(YulString _name, V const& _visitor)
 	{
 		if (Identifier* id = lookup(_name))
 		{
@@ -86,7 +82,7 @@ struct Scope
 	}
 	/// @returns true if the name exists in this scope or in super scopes (also searches
 	/// across function and assembly boundaries).
-	bool exists(yul::YulString _name) const;
+	bool exists(YulString _name) const;
 
 	/// @returns the number of variables directly registered inside the scope.
 	size_t numberOfVariables() const;
@@ -97,9 +93,7 @@ struct Scope
 	/// If true, variables from the super scope are not visible here (other identifiers are),
 	/// but they are still taken into account to prevent shadowing.
 	bool functionScope = false;
-	std::map<yul::YulString, Identifier> identifiers;
+	std::map<YulString, Identifier> identifiers;
 };
 
 }
-}
-}
diff --git a/libyul/AsmScopeFiller.cpp b/libyul/AsmScopeFiller.cpp
index 2070d8de..ee797d6a 100644
--- a/libyul/AsmScopeFiller.cpp
+++ b/libyul/AsmScopeFiller.cpp
@@ -37,8 +37,8 @@
 using namespace std;
 using namespace dev;
 using namespace langutil;
+using namespace yul;
 using namespace dev::solidity;
-using namespace dev::solidity::assembly;
 
 ScopeFiller::ScopeFiller(AsmAnalysisInfo& _info, ErrorReporter& _errorReporter):
 	m_info(_info), m_errorReporter(_errorReporter)
@@ -65,7 +65,7 @@ bool ScopeFiller::operator()(Label const& _item)
 	return true;
 }
 
-bool ScopeFiller::operator()(assembly::VariableDeclaration const& _varDecl)
+bool ScopeFiller::operator()(VariableDeclaration const& _varDecl)
 {
 	for (auto const& variable: _varDecl.variables)
 		if (!registerVariable(variable, _varDecl.location, *m_currentScope))
@@ -73,7 +73,7 @@ bool ScopeFiller::operator()(assembly::VariableDeclaration const& _varDecl)
 	return true;
 }
 
-bool ScopeFiller::operator()(assembly::FunctionDefinition const& _funDef)
+bool ScopeFiller::operator()(FunctionDefinition const& _funDef)
 {
 	bool success = true;
 	vector<Scope::YulType> arguments;
diff --git a/libyul/AsmScopeFiller.h b/libyul/AsmScopeFiller.h
index fbd65bba..e8fb88d5 100644
--- a/libyul/AsmScopeFiller.h
+++ b/libyul/AsmScopeFiller.h
@@ -33,11 +33,7 @@ class ErrorReporter;
 struct SourceLocation;
 }
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 
 struct TypedName;
@@ -53,21 +49,21 @@ class ScopeFiller: public boost::static_visitor<bool>
 public:
 	ScopeFiller(AsmAnalysisInfo& _info, langutil::ErrorReporter& _errorReporter);
 
-	bool operator()(assembly::Instruction const&) { return true; }
-	bool operator()(assembly::Literal const&) { return true; }
-	bool operator()(assembly::Identifier const&) { return true; }
-	bool operator()(assembly::FunctionalInstruction const&) { return true; }
-	bool operator()(assembly::ExpressionStatement const& _expr);
-	bool operator()(assembly::Label const& _label);
-	bool operator()(assembly::StackAssignment const&) { return true; }
-	bool operator()(assembly::Assignment const&) { return true; }
-	bool operator()(assembly::VariableDeclaration const& _variableDeclaration);
-	bool operator()(assembly::FunctionDefinition const& _functionDefinition);
-	bool operator()(assembly::FunctionCall const&) { return true; }
-	bool operator()(assembly::If const& _if);
-	bool operator()(assembly::Switch const& _switch);
-	bool operator()(assembly::ForLoop const& _forLoop);
-	bool operator()(assembly::Block const& _block);
+	bool operator()(Instruction const&) { return true; }
+	bool operator()(Literal const&) { return true; }
+	bool operator()(Identifier const&) { return true; }
+	bool operator()(FunctionalInstruction const&) { return true; }
+	bool operator()(ExpressionStatement const& _expr);
+	bool operator()(Label const& _label);
+	bool operator()(StackAssignment const&) { return true; }
+	bool operator()(Assignment const&) { return true; }
+	bool operator()(VariableDeclaration const& _variableDeclaration);
+	bool operator()(FunctionDefinition const& _functionDefinition);
+	bool operator()(FunctionCall const&) { return true; }
+	bool operator()(If const& _if);
+	bool operator()(Switch const& _switch);
+	bool operator()(ForLoop const& _forLoop);
+	bool operator()(Block const& _block);
 
 private:
 	bool registerVariable(
@@ -76,7 +72,7 @@ private:
 		Scope& _scope
 	);
 
-	Scope& scope(assembly::Block const* _block);
+	Scope& scope(Block const* _block);
 
 	Scope* m_currentScope = nullptr;
 	AsmAnalysisInfo& m_info;
@@ -84,5 +80,3 @@ private:
 };
 
 }
-}
-}
diff --git a/libyul/Exceptions.h b/libyul/Exceptions.h
index 0c421dbf..e10e53ef 100644
--- a/libyul/Exceptions.h
+++ b/libyul/Exceptions.h
@@ -23,18 +23,15 @@
 #include <libdevcore/Exceptions.h>
 #include <libdevcore/Assertions.h>
 
-namespace dev
-{
 namespace yul
 {
 
-struct YulException: virtual Exception {};
+struct YulException: virtual dev::Exception {};
 struct OptimizerException: virtual YulException {};
 struct YulAssertion: virtual YulException {};
 
 /// Assertion that throws an YulAssertion containing the given description if it is not met.
 #define yulAssert(CONDITION, DESCRIPTION) \
-        assertThrow(CONDITION, ::dev::yul::YulException, DESCRIPTION)
+        assertThrow(CONDITION, ::yul::YulException, DESCRIPTION)
 
 }
-}
diff --git a/libyul/YulString.h b/libyul/YulString.h
index ad900a70..2179c23b 100644
--- a/libyul/YulString.h
+++ b/libyul/YulString.h
@@ -27,8 +27,6 @@
 #include <vector>
 #include <string>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -130,4 +128,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/backends/evm/AbstractAssembly.h b/libyul/backends/evm/AbstractAssembly.h
index 5a1140cb..97b1d305 100644
--- a/libyul/backends/evm/AbstractAssembly.h
+++ b/libyul/backends/evm/AbstractAssembly.h
@@ -22,6 +22,7 @@
 
 #pragma once
 
+#include <libdevcore/Common.h>
 #include <libdevcore/CommonData.h>
 
 #include <functional>
@@ -36,14 +37,13 @@ namespace dev
 namespace solidity
 {
 enum class Instruction: uint8_t;
-namespace assembly
-{
-struct Instruction;
-struct Identifier;
 }
 }
+
 namespace yul
 {
+struct Instruction;
+struct Identifier;
 
 ///
 /// Assembly class that abstracts both the libevmasm assembly and the new Yul assembly.
@@ -61,9 +61,9 @@ public:
 	/// at the beginning.
 	virtual int stackHeight() const = 0;
 	/// Append an EVM instruction.
-	virtual void appendInstruction(solidity::Instruction _instruction) = 0;
+	virtual void appendInstruction(dev::solidity::Instruction _instruction) = 0;
 	/// Append a constant.
-	virtual void appendConstant(u256 const& _constant) = 0;
+	virtual void appendConstant(dev::u256 const& _constant) = 0;
 	/// Append a label.
 	virtual void appendLabel(LabelID _labelId) = 0;
 	/// Append a label reference.
@@ -106,18 +106,15 @@ enum class IdentifierContext { LValue, RValue };
 /// to inline assembly (not used in standalone assembly mode).
 struct ExternalIdentifierAccess
 {
-	using Resolver = std::function<size_t(solidity::assembly::Identifier const&, IdentifierContext, bool /*_crossesFunctionBoundary*/)>;
+	using Resolver = std::function<size_t(Identifier const&, IdentifierContext, bool /*_crossesFunctionBoundary*/)>;
 	/// Resolve an external reference given by the identifier in the given context.
 	/// @returns the size of the value (number of stack slots) or size_t(-1) if not found.
 	Resolver resolve;
-	using CodeGenerator = std::function<void(solidity::assembly::Identifier const&, IdentifierContext, yul::AbstractAssembly&)>;
+	using CodeGenerator = std::function<void(Identifier const&, IdentifierContext, yul::AbstractAssembly&)>;
 	/// Generate code for retrieving the value (rvalue context) or storing the value (lvalue context)
 	/// of an identifier. The code should be appended to the assembly. In rvalue context, the value is supposed
 	/// to be put onto the stack, in lvalue context, the value is assumed to be at the top of the stack.
 	CodeGenerator generateCode;
 };
 
-
-
-}
 }
diff --git a/libyul/backends/evm/EVMAssembly.cpp b/libyul/backends/evm/EVMAssembly.cpp
index 791b6226..99506317 100644
--- a/libyul/backends/evm/EVMAssembly.cpp
+++ b/libyul/backends/evm/EVMAssembly.cpp
@@ -27,7 +27,7 @@
 using namespace std;
 using namespace dev;
 using namespace langutil;
-using namespace dev::yul;
+using namespace yul;
 
 namespace
 {
diff --git a/libyul/backends/evm/EVMAssembly.h b/libyul/backends/evm/EVMAssembly.h
index c9190634..d0a437cc 100644
--- a/libyul/backends/evm/EVMAssembly.h
+++ b/libyul/backends/evm/EVMAssembly.h
@@ -31,8 +31,6 @@ namespace langutil
 struct SourceLocation;
 }
 
-namespace dev
-{
 namespace yul
 {
 
@@ -48,9 +46,9 @@ public:
 	/// at the beginning.
 	int stackHeight() const override { return m_stackHeight; }
 	/// Append an EVM instruction.
-	void appendInstruction(solidity::Instruction _instruction) override;
+	void appendInstruction(dev::solidity::Instruction _instruction) override;
 	/// Append a constant.
-	void appendConstant(u256 const& _constant) override;
+	void appendConstant(dev::u256 const& _constant) override;
 	/// Append a label.
 	void appendLabel(LabelID _labelId) override;
 	/// Append a label reference.
@@ -81,17 +79,17 @@ public:
 	void appendAssemblySize() override;
 
 	/// Resolves references inside the bytecode and returns the linker object.
-	eth::LinkerObject finalize();
+	dev::eth::LinkerObject finalize();
 
 private:
 	void setLabelToCurrentPosition(AbstractAssembly::LabelID _labelId);
 	void appendLabelReferenceInternal(AbstractAssembly::LabelID _labelId);
-	void updateReference(size_t pos, size_t size, u256 value);
+	void updateReference(size_t pos, size_t size, dev::u256 value);
 
 	bool m_evm15 = false; ///< if true, switch to evm1.5 mode
 	LabelID m_nextLabelId = 0;
 	int m_stackHeight = 0;
-	bytes m_bytecode;
+	dev::bytes m_bytecode;
 	std::map<std::string, LabelID> m_namedLabels;
 	std::map<LabelID, size_t> m_labelPositions;
 	std::map<size_t, LabelID> m_labelReferences;
@@ -99,4 +97,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/backends/evm/EVMCodeTransform.cpp b/libyul/backends/evm/EVMCodeTransform.cpp
index 3cf1061a..12abd754 100644
--- a/libyul/backends/evm/EVMCodeTransform.cpp
+++ b/libyul/backends/evm/EVMCodeTransform.cpp
@@ -29,11 +29,9 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
-using Scope = dev::solidity::assembly::Scope;
-
 void CodeTransform::operator()(VariableDeclaration const& _varDecl)
 {
 	solAssert(m_scope, "");
@@ -147,7 +145,7 @@ void CodeTransform::operator()(FunctionalInstruction const& _instruction)
 			solAssert(_instruction.arguments.size() == 1, "");
 		}
 		m_assembly.setSourceLocation(_instruction.location);
-		auto label = labelFromIdentifier(boost::get<assembly::Identifier>(_instruction.arguments.at(0)));
+		auto label = labelFromIdentifier(boost::get<Identifier>(_instruction.arguments.at(0)));
 		if (isJumpI)
 			m_assembly.appendJumpToIf(label);
 		else
@@ -163,7 +161,7 @@ void CodeTransform::operator()(FunctionalInstruction const& _instruction)
 	checkStackHeight(&_instruction);
 }
 
-void CodeTransform::operator()(assembly::Identifier const& _identifier)
+void CodeTransform::operator()(Identifier const& _identifier)
 {
 	m_assembly.setSourceLocation(_identifier.location);
 	// First search internals, then externals.
@@ -197,12 +195,12 @@ void CodeTransform::operator()(assembly::Identifier const& _identifier)
 	checkStackHeight(&_identifier);
 }
 
-void CodeTransform::operator()(assembly::Literal const& _literal)
+void CodeTransform::operator()(Literal const& _literal)
 {
 	m_assembly.setSourceLocation(_literal.location);
-	if (_literal.kind == assembly::LiteralKind::Number)
+	if (_literal.kind == LiteralKind::Number)
 		m_assembly.appendConstant(u256(_literal.value.str()));
-	else if (_literal.kind == assembly::LiteralKind::Boolean)
+	else if (_literal.kind == LiteralKind::Boolean)
 	{
 		if (_literal.value.str() == "true")
 			m_assembly.appendConstant(u256(1));
@@ -217,7 +215,7 @@ void CodeTransform::operator()(assembly::Literal const& _literal)
 	checkStackHeight(&_literal);
 }
 
-void CodeTransform::operator()(assembly::Instruction const& _instruction)
+void CodeTransform::operator()(yul::Instruction const& _instruction)
 {
 	solAssert(!m_evm15 || _instruction.instruction != solidity::Instruction::JUMP, "Bare JUMP instruction used for EVM1.5");
 	solAssert(!m_evm15 || _instruction.instruction != solidity::Instruction::JUMPI, "Bare JUMPI instruction used for EVM1.5");
@@ -522,7 +520,7 @@ void CodeTransform::generateAssignment(Identifier const& _variableName)
 	}
 }
 
-int CodeTransform::variableHeightDiff(solidity::assembly::Scope::Variable const& _var, bool _forSwap) const
+int CodeTransform::variableHeightDiff(Scope::Variable const& _var, bool _forSwap) const
 {
 	solAssert(m_context->variableStackHeights.count(&_var), "");
 	int heightDiff = m_assembly.stackHeight() - m_context->variableStackHeights[&_var];
diff --git a/libyul/backends/evm/EVMCodeTransform.h b/libyul/backends/evm/EVMCodeTransform.h
index f4696e81..bf195dcd 100644
--- a/libyul/backends/evm/EVMCodeTransform.h
+++ b/libyul/backends/evm/EVMCodeTransform.h
@@ -27,18 +27,14 @@
 #include <boost/variant.hpp>
 #include <boost/optional.hpp>
 
-namespace dev
-{
-namespace solidity
+namespace langutil
 {
 class ErrorReporter;
-namespace assembly
-{
-struct AsmAnalysisInfo;
-}
 }
+
 namespace yul
 {
+struct AsmAnalysisInfo;
 class EVMAssembly;
 
 class CodeTransform: public boost::static_visitor<>
@@ -47,8 +43,8 @@ public:
 	/// Create the code transformer.
 	/// @param _identifierAccess used to resolve identifiers external to the inline assembly
 	CodeTransform(
-		yul::AbstractAssembly& _assembly,
-		solidity::assembly::AsmAnalysisInfo& _analysisInfo,
+		AbstractAssembly& _assembly,
+		AsmAnalysisInfo& _analysisInfo,
 		bool _yul = false,
 		bool _evm15 = false,
 		ExternalIdentifierAccess const& _identifierAccess = ExternalIdentifierAccess(),
@@ -69,15 +65,14 @@ public:
 protected:
 	struct Context
 	{
-		using Scope = solidity::assembly::Scope;
 		std::map<Scope::Label const*, AbstractAssembly::LabelID> labelIDs;
 		std::map<Scope::Function const*, AbstractAssembly::LabelID> functionEntryIDs;
 		std::map<Scope::Variable const*, int> variableStackHeights;
 	};
 
 	CodeTransform(
-		yul::AbstractAssembly& _assembly,
-		solidity::assembly::AsmAnalysisInfo& _analysisInfo,
+		AbstractAssembly& _assembly,
+		AsmAnalysisInfo& _analysisInfo,
 		bool _yul,
 		bool _evm15,
 		ExternalIdentifierAccess const& _identifierAccess,
@@ -116,8 +111,8 @@ private:
 	AbstractAssembly::LabelID labelFromIdentifier(Identifier const& _identifier);
 	/// @returns the label ID corresponding to the given label, allocating a new one if
 	/// necessary.
-	AbstractAssembly::LabelID labelID(solidity::assembly::Scope::Label const& _label);
-	AbstractAssembly::LabelID functionEntryID(YulString _name, solidity::assembly::Scope::Function const& _function);
+	AbstractAssembly::LabelID labelID(Scope::Label const& _label);
+	AbstractAssembly::LabelID functionEntryID(YulString _name, Scope::Function const& _function);
 	/// Generates code for an expression that is supposed to return a single value.
 	void visitExpression(Expression const& _expression);
 
@@ -133,15 +128,15 @@ private:
 	/// Determines the stack height difference to the given variables. Throws
 	/// if it is not yet in scope or the height difference is too large. Returns
 	/// the (positive) stack height difference otherwise.
-	int variableHeightDiff(solidity::assembly::Scope::Variable const& _var, bool _forSwap) const;
+	int variableHeightDiff(Scope::Variable const& _var, bool _forSwap) const;
 
 	void expectDeposit(int _deposit, int _oldHeight) const;
 
 	void checkStackHeight(void const* _astElement) const;
 
-	yul::AbstractAssembly& m_assembly;
-	solidity::assembly::AsmAnalysisInfo& m_info;
-	solidity::assembly::Scope* m_scope = nullptr;
+	AbstractAssembly& m_assembly;
+	AsmAnalysisInfo& m_info;
+	Scope* m_scope = nullptr;
 	bool m_yul = false;
 	bool m_evm15 = false;
 	bool m_useNamedLabelsForFunctions = false;
@@ -155,4 +150,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/ASTCopier.cpp b/libyul/optimiser/ASTCopier.cpp
index d4781ec2..f18b0e6b 100644
--- a/libyul/optimiser/ASTCopier.cpp
+++ b/libyul/optimiser/ASTCopier.cpp
@@ -28,7 +28,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 Statement ASTCopier::operator()(Instruction const&)
 {
diff --git a/libyul/optimiser/ASTCopier.h b/libyul/optimiser/ASTCopier.h
index 95e58a56..7daf74b8 100644
--- a/libyul/optimiser/ASTCopier.h
+++ b/libyul/optimiser/ASTCopier.h
@@ -31,8 +31,6 @@
 #include <set>
 #include <memory>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -123,4 +121,3 @@ std::vector<T> ASTCopier::translateVector(std::vector<T> const& _values)
 
 
 }
-}
diff --git a/libyul/optimiser/ASTWalker.cpp b/libyul/optimiser/ASTWalker.cpp
index ed4a07ad..0d568007 100644
--- a/libyul/optimiser/ASTWalker.cpp
+++ b/libyul/optimiser/ASTWalker.cpp
@@ -26,7 +26,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 
diff --git a/libyul/optimiser/ASTWalker.h b/libyul/optimiser/ASTWalker.h
index 38cb85ea..9647c323 100644
--- a/libyul/optimiser/ASTWalker.h
+++ b/libyul/optimiser/ASTWalker.h
@@ -32,8 +32,6 @@
 #include <set>
 #include <map>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -120,4 +118,3 @@ protected:
 };
 
 }
-}
diff --git a/libyul/optimiser/BlockFlattener.cpp b/libyul/optimiser/BlockFlattener.cpp
index 4552e3f1..e6f08524 100644
--- a/libyul/optimiser/BlockFlattener.cpp
+++ b/libyul/optimiser/BlockFlattener.cpp
@@ -22,7 +22,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 void BlockFlattener::operator()(Block& _block)
 {
diff --git a/libyul/optimiser/BlockFlattener.h b/libyul/optimiser/BlockFlattener.h
index 88c49dda..b732422d 100644
--- a/libyul/optimiser/BlockFlattener.h
+++ b/libyul/optimiser/BlockFlattener.h
@@ -18,8 +18,6 @@
 
 #include <libyul/optimiser/ASTWalker.h>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -31,4 +29,3 @@ public:
 };
 
 }
-}
diff --git a/libyul/optimiser/CommonSubexpressionEliminator.cpp b/libyul/optimiser/CommonSubexpressionEliminator.cpp
index fc78b1ad..9b851333 100644
--- a/libyul/optimiser/CommonSubexpressionEliminator.cpp
+++ b/libyul/optimiser/CommonSubexpressionEliminator.cpp
@@ -28,7 +28,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 void CommonSubexpressionEliminator::visit(Expression& _e)
 {
diff --git a/libyul/optimiser/CommonSubexpressionEliminator.h b/libyul/optimiser/CommonSubexpressionEliminator.h
index 16b39f5b..ac1ebe3a 100644
--- a/libyul/optimiser/CommonSubexpressionEliminator.h
+++ b/libyul/optimiser/CommonSubexpressionEliminator.h
@@ -23,8 +23,6 @@
 
 #include <libyul/optimiser/DataFlowAnalyzer.h>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -42,4 +40,3 @@ protected:
 };
 
 }
-}
diff --git a/libyul/optimiser/DataFlowAnalyzer.cpp b/libyul/optimiser/DataFlowAnalyzer.cpp
index 046f466c..64c67b38 100644
--- a/libyul/optimiser/DataFlowAnalyzer.cpp
+++ b/libyul/optimiser/DataFlowAnalyzer.cpp
@@ -33,7 +33,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 void DataFlowAnalyzer::operator()(Assignment& _assignment)
 {
diff --git a/libyul/optimiser/DataFlowAnalyzer.h b/libyul/optimiser/DataFlowAnalyzer.h
index f83543c5..cd134d48 100644
--- a/libyul/optimiser/DataFlowAnalyzer.h
+++ b/libyul/optimiser/DataFlowAnalyzer.h
@@ -28,8 +28,6 @@
 #include <map>
 #include <set>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -87,4 +85,3 @@ protected:
 };
 
 }
-}
diff --git a/libyul/optimiser/Disambiguator.cpp b/libyul/optimiser/Disambiguator.cpp
index e8c31aea..fda5895b 100644
--- a/libyul/optimiser/Disambiguator.cpp
+++ b/libyul/optimiser/Disambiguator.cpp
@@ -26,11 +26,9 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
-using Scope = dev::solidity::assembly::Scope;
-
 YulString Disambiguator::translateIdentifier(YulString _originalName)
 {
 	if ((m_externallyUsedIdentifiers.count(_originalName)))
diff --git a/libyul/optimiser/Disambiguator.h b/libyul/optimiser/Disambiguator.h
index b2f80e47..4dd278e6 100644
--- a/libyul/optimiser/Disambiguator.h
+++ b/libyul/optimiser/Disambiguator.h
@@ -30,8 +30,6 @@
 
 #include <set>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -42,7 +40,7 @@ class Disambiguator: public ASTCopier
 {
 public:
 	explicit Disambiguator(
-		solidity::assembly::AsmAnalysisInfo const& _analysisInfo,
+		AsmAnalysisInfo const& _analysisInfo,
 		std::set<YulString> const& _externallyUsedIdentifiers = {}
 	):
 		m_info(_analysisInfo), m_externallyUsedIdentifiers(_externallyUsedIdentifiers), m_nameDispenser(m_externallyUsedIdentifiers)
@@ -56,16 +54,15 @@ protected:
 	void leaveFunction(FunctionDefinition const& _function) override;
 	YulString translateIdentifier(YulString _name) override;
 
-	void enterScopeInternal(solidity::assembly::Scope& _scope);
-	void leaveScopeInternal(solidity::assembly::Scope& _scope);
+	void enterScopeInternal(Scope& _scope);
+	void leaveScopeInternal(Scope& _scope);
 
-	solidity::assembly::AsmAnalysisInfo const& m_info;
+	AsmAnalysisInfo const& m_info;
 	std::set<YulString> const& m_externallyUsedIdentifiers;
 
-	std::vector<solidity::assembly::Scope*> m_scopes;
+	std::vector<Scope*> m_scopes;
 	std::map<void const*, YulString> m_translations;
 	NameDispenser m_nameDispenser;
 };
 
 }
-}
diff --git a/libyul/optimiser/ExpressionInliner.cpp b/libyul/optimiser/ExpressionInliner.cpp
index abc006d4..27d43ac0 100644
--- a/libyul/optimiser/ExpressionInliner.cpp
+++ b/libyul/optimiser/ExpressionInliner.cpp
@@ -29,7 +29,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 void ExpressionInliner::run()
diff --git a/libyul/optimiser/ExpressionInliner.h b/libyul/optimiser/ExpressionInliner.h
index 46c27080..681b0db4 100644
--- a/libyul/optimiser/ExpressionInliner.h
+++ b/libyul/optimiser/ExpressionInliner.h
@@ -27,8 +27,6 @@
 
 #include <set>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -68,4 +66,3 @@ private:
 
 
 }
-}
diff --git a/libyul/optimiser/ExpressionJoiner.cpp b/libyul/optimiser/ExpressionJoiner.cpp
index 90301bad..de2b5d53 100644
--- a/libyul/optimiser/ExpressionJoiner.cpp
+++ b/libyul/optimiser/ExpressionJoiner.cpp
@@ -32,7 +32,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 void ExpressionJoiner::operator()(FunctionalInstruction& _instruction)
diff --git a/libyul/optimiser/ExpressionJoiner.h b/libyul/optimiser/ExpressionJoiner.h
index 62d3beb9..2d680b5c 100644
--- a/libyul/optimiser/ExpressionJoiner.h
+++ b/libyul/optimiser/ExpressionJoiner.h
@@ -25,8 +25,6 @@
 
 #include <map>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -98,4 +96,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/ExpressionSimplifier.cpp b/libyul/optimiser/ExpressionSimplifier.cpp
index 8746a783..cda44e8e 100644
--- a/libyul/optimiser/ExpressionSimplifier.cpp
+++ b/libyul/optimiser/ExpressionSimplifier.cpp
@@ -29,7 +29,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 
diff --git a/libyul/optimiser/ExpressionSimplifier.h b/libyul/optimiser/ExpressionSimplifier.h
index 5965a1bb..83e82b2b 100644
--- a/libyul/optimiser/ExpressionSimplifier.h
+++ b/libyul/optimiser/ExpressionSimplifier.h
@@ -24,8 +24,6 @@
 
 #include <libyul/optimiser/ASTWalker.h>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -52,4 +50,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/ExpressionSplitter.cpp b/libyul/optimiser/ExpressionSplitter.cpp
index 54a03620..a3b2dc11 100644
--- a/libyul/optimiser/ExpressionSplitter.cpp
+++ b/libyul/optimiser/ExpressionSplitter.cpp
@@ -32,7 +32,7 @@
 using namespace std;
 using namespace dev;
 using namespace langutil;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 void ExpressionSplitter::operator()(FunctionalInstruction& _instruction)
diff --git a/libyul/optimiser/ExpressionSplitter.h b/libyul/optimiser/ExpressionSplitter.h
index 82274203..e5b86adc 100644
--- a/libyul/optimiser/ExpressionSplitter.h
+++ b/libyul/optimiser/ExpressionSplitter.h
@@ -27,8 +27,6 @@
 
 #include <vector>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -83,4 +81,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/ForLoopInitRewriter.cpp b/libyul/optimiser/ForLoopInitRewriter.cpp
index b5e59884..80d39248 100644
--- a/libyul/optimiser/ForLoopInitRewriter.cpp
+++ b/libyul/optimiser/ForLoopInitRewriter.cpp
@@ -21,7 +21,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 void ForLoopInitRewriter::operator()(Block& _block)
 {
diff --git a/libyul/optimiser/ForLoopInitRewriter.h b/libyul/optimiser/ForLoopInitRewriter.h
index 64f53711..e925c6c2 100644
--- a/libyul/optimiser/ForLoopInitRewriter.h
+++ b/libyul/optimiser/ForLoopInitRewriter.h
@@ -18,8 +18,6 @@
 
 #include <libyul/optimiser/ASTWalker.h>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -36,4 +34,3 @@ public:
 };
 
 }
-}
diff --git a/libyul/optimiser/FullInliner.cpp b/libyul/optimiser/FullInliner.cpp
index 47299f5f..8ae26fbb 100644
--- a/libyul/optimiser/FullInliner.cpp
+++ b/libyul/optimiser/FullInliner.cpp
@@ -36,7 +36,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 FullInliner::FullInliner(Block& _ast, NameDispenser& _dispenser):
diff --git a/libyul/optimiser/FullInliner.h b/libyul/optimiser/FullInliner.h
index 5ebb3bf6..161d1945 100644
--- a/libyul/optimiser/FullInliner.h
+++ b/libyul/optimiser/FullInliner.h
@@ -33,8 +33,6 @@
 
 #include <set>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -153,4 +151,3 @@ public:
 
 
 }
-}
diff --git a/libyul/optimiser/FunctionGrouper.cpp b/libyul/optimiser/FunctionGrouper.cpp
index dc721cae..02ce22cd 100644
--- a/libyul/optimiser/FunctionGrouper.cpp
+++ b/libyul/optimiser/FunctionGrouper.cpp
@@ -27,7 +27,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 
diff --git a/libyul/optimiser/FunctionGrouper.h b/libyul/optimiser/FunctionGrouper.h
index 63cfbfb1..508daf5d 100644
--- a/libyul/optimiser/FunctionGrouper.h
+++ b/libyul/optimiser/FunctionGrouper.h
@@ -23,8 +23,6 @@
 
 #include <libyul/ASTDataForward.h>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -43,4 +41,3 @@ public:
 };
 
 }
-}
diff --git a/libyul/optimiser/FunctionHoister.cpp b/libyul/optimiser/FunctionHoister.cpp
index 51755968..bd1c781b 100644
--- a/libyul/optimiser/FunctionHoister.cpp
+++ b/libyul/optimiser/FunctionHoister.cpp
@@ -28,7 +28,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 void FunctionHoister::operator()(Block& _block)
diff --git a/libyul/optimiser/FunctionHoister.h b/libyul/optimiser/FunctionHoister.h
index 29894895..3d53aa89 100644
--- a/libyul/optimiser/FunctionHoister.h
+++ b/libyul/optimiser/FunctionHoister.h
@@ -24,8 +24,6 @@
 #include <libyul/ASTDataForward.h>
 #include <libyul/optimiser/ASTWalker.h>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -48,4 +46,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/InlinableExpressionFunctionFinder.cpp b/libyul/optimiser/InlinableExpressionFunctionFinder.cpp
index 22267b62..662cdf25 100644
--- a/libyul/optimiser/InlinableExpressionFunctionFinder.cpp
+++ b/libyul/optimiser/InlinableExpressionFunctionFinder.cpp
@@ -25,7 +25,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 void InlinableExpressionFunctionFinder::operator()(Identifier const& _identifier)
 {
diff --git a/libyul/optimiser/InlinableExpressionFunctionFinder.h b/libyul/optimiser/InlinableExpressionFunctionFinder.h
index a96f042f..f64155de 100644
--- a/libyul/optimiser/InlinableExpressionFunctionFinder.h
+++ b/libyul/optimiser/InlinableExpressionFunctionFinder.h
@@ -25,8 +25,6 @@
 
 #include <set>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -66,4 +64,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/MainFunction.cpp b/libyul/optimiser/MainFunction.cpp
index 5f335031..63eea2db 100644
--- a/libyul/optimiser/MainFunction.cpp
+++ b/libyul/optimiser/MainFunction.cpp
@@ -30,7 +30,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 void MainFunction::operator()(Block& _block)
diff --git a/libyul/optimiser/MainFunction.h b/libyul/optimiser/MainFunction.h
index 4a73283a..f4a64303 100644
--- a/libyul/optimiser/MainFunction.h
+++ b/libyul/optimiser/MainFunction.h
@@ -23,8 +23,6 @@
 
 #include <libyul/ASTDataForward.h>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -38,4 +36,3 @@ public:
 };
 
 }
-}
diff --git a/libyul/optimiser/Metrics.cpp b/libyul/optimiser/Metrics.cpp
index 5107fc59..a5557fb3 100644
--- a/libyul/optimiser/Metrics.cpp
+++ b/libyul/optimiser/Metrics.cpp
@@ -23,7 +23,7 @@
 #include <libyul/AsmData.h>
 
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 size_t CodeSize::codeSize(Statement const& _statement)
 {
diff --git a/libyul/optimiser/Metrics.h b/libyul/optimiser/Metrics.h
index e65110a8..ca244600 100644
--- a/libyul/optimiser/Metrics.h
+++ b/libyul/optimiser/Metrics.h
@@ -22,8 +22,6 @@
 
 #include <libyul/optimiser/ASTWalker.h>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -49,4 +47,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/NameCollector.cpp b/libyul/optimiser/NameCollector.cpp
index 7da001f8..f9079827 100644
--- a/libyul/optimiser/NameCollector.cpp
+++ b/libyul/optimiser/NameCollector.cpp
@@ -24,7 +24,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 void NameCollector::operator()(VariableDeclaration const& _varDecl)
 {
diff --git a/libyul/optimiser/NameCollector.h b/libyul/optimiser/NameCollector.h
index 8ef0178d..c177a399 100644
--- a/libyul/optimiser/NameCollector.h
+++ b/libyul/optimiser/NameCollector.h
@@ -25,8 +25,6 @@
 #include <map>
 #include <set>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -83,4 +81,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/NameDispenser.cpp b/libyul/optimiser/NameDispenser.cpp
index 11e85477..e7cdc60f 100644
--- a/libyul/optimiser/NameDispenser.cpp
+++ b/libyul/optimiser/NameDispenser.cpp
@@ -25,7 +25,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 NameDispenser::NameDispenser(Block const& _ast):
 	NameDispenser(NameCollector(_ast).names())
diff --git a/libyul/optimiser/NameDispenser.h b/libyul/optimiser/NameDispenser.h
index 7311440b..1d31fd38 100644
--- a/libyul/optimiser/NameDispenser.h
+++ b/libyul/optimiser/NameDispenser.h
@@ -25,8 +25,6 @@
 
 #include <set>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -58,4 +56,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/RedundantAssignEliminator.cpp b/libyul/optimiser/RedundantAssignEliminator.cpp
index f415a36c..7b18e8ca 100644
--- a/libyul/optimiser/RedundantAssignEliminator.cpp
+++ b/libyul/optimiser/RedundantAssignEliminator.cpp
@@ -30,7 +30,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 void RedundantAssignEliminator::operator()(Identifier const& _identifier)
diff --git a/libyul/optimiser/RedundantAssignEliminator.h b/libyul/optimiser/RedundantAssignEliminator.h
index bffbb07a..014a7c77 100644
--- a/libyul/optimiser/RedundantAssignEliminator.h
+++ b/libyul/optimiser/RedundantAssignEliminator.h
@@ -26,8 +26,6 @@
 
 #include <map>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -189,4 +187,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/Rematerialiser.cpp b/libyul/optimiser/Rematerialiser.cpp
index b9a127bb..4180bfc3 100644
--- a/libyul/optimiser/Rematerialiser.cpp
+++ b/libyul/optimiser/Rematerialiser.cpp
@@ -27,7 +27,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 void Rematerialiser::visit(Expression& _e)
 {
diff --git a/libyul/optimiser/Rematerialiser.h b/libyul/optimiser/Rematerialiser.h
index f0e7cb01..b3841519 100644
--- a/libyul/optimiser/Rematerialiser.h
+++ b/libyul/optimiser/Rematerialiser.h
@@ -22,8 +22,6 @@
 
 #include <libyul/optimiser/DataFlowAnalyzer.h>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -41,4 +39,3 @@ protected:
 };
 
 }
-}
diff --git a/libyul/optimiser/SSATransform.cpp b/libyul/optimiser/SSATransform.cpp
index ae84dd94..928c0859 100644
--- a/libyul/optimiser/SSATransform.cpp
+++ b/libyul/optimiser/SSATransform.cpp
@@ -31,7 +31,7 @@
 using namespace std;
 using namespace dev;
 using namespace langutil;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
 void SSATransform::operator()(Identifier& _identifier)
diff --git a/libyul/optimiser/SSATransform.h b/libyul/optimiser/SSATransform.h
index 69638904..2f069284 100644
--- a/libyul/optimiser/SSATransform.h
+++ b/libyul/optimiser/SSATransform.h
@@ -25,8 +25,6 @@
 
 #include <vector>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -94,4 +92,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/SSAValueTracker.cpp b/libyul/optimiser/SSAValueTracker.cpp
index 24776498..35b29b04 100644
--- a/libyul/optimiser/SSAValueTracker.cpp
+++ b/libyul/optimiser/SSAValueTracker.cpp
@@ -25,7 +25,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 void SSAValueTracker::operator()(Assignment const& _assignment)
 {
diff --git a/libyul/optimiser/SSAValueTracker.h b/libyul/optimiser/SSAValueTracker.h
index acd5229c..e182e013 100644
--- a/libyul/optimiser/SSAValueTracker.h
+++ b/libyul/optimiser/SSAValueTracker.h
@@ -26,8 +26,6 @@
 #include <map>
 #include <set>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -54,4 +52,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/Semantics.cpp b/libyul/optimiser/Semantics.cpp
index ad9b1922..91bb2709 100644
--- a/libyul/optimiser/Semantics.cpp
+++ b/libyul/optimiser/Semantics.cpp
@@ -29,7 +29,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 MovableChecker::MovableChecker(Expression const& _expression)
 {
diff --git a/libyul/optimiser/Semantics.h b/libyul/optimiser/Semantics.h
index a7e8706b..70c50806 100644
--- a/libyul/optimiser/Semantics.h
+++ b/libyul/optimiser/Semantics.h
@@ -24,8 +24,6 @@
 
 #include <set>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -57,4 +55,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/SimplificationRules.cpp b/libyul/optimiser/SimplificationRules.cpp
index ec5379fc..b3190fef 100644
--- a/libyul/optimiser/SimplificationRules.cpp
+++ b/libyul/optimiser/SimplificationRules.cpp
@@ -31,7 +31,7 @@
 using namespace std;
 using namespace dev;
 using namespace langutil;
-using namespace dev::yul;
+using namespace yul;
 
 
 SimplificationRule<Pattern> const* SimplificationRules::findFirstMatch(
@@ -123,7 +123,7 @@ bool Pattern::matches(Expression const& _expr, map<YulString, Expression const*>
 		if (expr->type() != typeid(Literal))
 			return false;
 		Literal const& literal = boost::get<Literal>(*expr);
-		if (literal.kind != assembly::LiteralKind::Number)
+		if (literal.kind != LiteralKind::Number)
 			return false;
 		if (m_data && *m_data != u256(literal.value.str()))
 			return false;
@@ -193,7 +193,7 @@ Expression Pattern::toExpression(SourceLocation const& _location) const
 	if (m_kind == PatternKind::Constant)
 	{
 		assertThrow(m_data, OptimizerException, "No match group and no constant value given.");
-		return Literal{_location, assembly::LiteralKind::Number, YulString{formatNumber(*m_data)}, {}};
+		return Literal{_location, LiteralKind::Number, YulString{formatNumber(*m_data)}, {}};
 	}
 	else if (m_kind == PatternKind::Operation)
 	{
@@ -208,7 +208,7 @@ Expression Pattern::toExpression(SourceLocation const& _location) const
 u256 Pattern::d() const
 {
 	Literal const& literal = boost::get<Literal>(matchGroupValue());
-	assertThrow(literal.kind == assembly::LiteralKind::Number, OptimizerException, "");
+	assertThrow(literal.kind == LiteralKind::Number, OptimizerException, "");
 	assertThrow(isValidDecimal(literal.value.str()) || isValidHex(literal.value.str()), OptimizerException, "");
 	return u256(literal.value.str());
 }
diff --git a/libyul/optimiser/SimplificationRules.h b/libyul/optimiser/SimplificationRules.h
index 3d3d8d2b..023a61f7 100644
--- a/libyul/optimiser/SimplificationRules.h
+++ b/libyul/optimiser/SimplificationRules.h
@@ -31,8 +31,6 @@
 #include <functional>
 #include <vector>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -85,11 +83,11 @@ public:
 	/// Matches any expression.
 	Pattern(PatternKind _kind = PatternKind::Any): m_kind(_kind) {}
 	// Matches a specific constant value.
-	Pattern(unsigned _value): Pattern(u256(_value)) {}
+	Pattern(unsigned _value): Pattern(dev::u256(_value)) {}
 	// Matches a specific constant value.
-	Pattern(u256 const& _value): m_kind(PatternKind::Constant), m_data(std::make_shared<u256>(_value)) {}
+	Pattern(dev::u256 const& _value): m_kind(PatternKind::Constant), m_data(std::make_shared<dev::u256>(_value)) {}
 	// Matches a given instruction with given arguments
-	Pattern(solidity::Instruction _instruction, std::vector<Pattern> const& _arguments = {});
+	Pattern(dev::solidity::Instruction _instruction, std::vector<Pattern> const& _arguments = {});
 	/// Sets this pattern to be part of the match group with the identifier @a _group.
 	/// Inside one rule, all patterns in the same match group have to match expressions from the
 	/// same expression equivalence class.
@@ -100,9 +98,9 @@ public:
 	std::vector<Pattern> arguments() const { return m_arguments; }
 
 	/// @returns the data of the matched expression if this pattern is part of a match group.
-	u256 d() const;
+	dev::u256 d() const;
 
-	solidity::Instruction instruction() const;
+	dev::solidity::Instruction instruction() const;
 
 	/// Turns this pattern into an actual expression. Should only be called
 	/// for patterns resulting from an action, i.e. with match groups assigned.
@@ -112,12 +110,11 @@ private:
 	Expression const& matchGroupValue() const;
 
 	PatternKind m_kind = PatternKind::Any;
-	solidity::Instruction m_instruction; ///< Only valid if m_kind is Operation
-	std::shared_ptr<u256> m_data; ///< Only valid if m_kind is Constant
+	dev::solidity::Instruction m_instruction; ///< Only valid if m_kind is Operation
+	std::shared_ptr<dev::u256> m_data; ///< Only valid if m_kind is Constant
 	std::vector<Pattern> m_arguments;
 	unsigned m_matchGroup = 0;
 	std::map<unsigned, Expression const*>* m_matchGroups = nullptr;
 };
 
 }
-}
diff --git a/libyul/optimiser/Substitution.cpp b/libyul/optimiser/Substitution.cpp
index dbac5cf6..bc9efe96 100644
--- a/libyul/optimiser/Substitution.cpp
+++ b/libyul/optimiser/Substitution.cpp
@@ -24,7 +24,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 Expression Substitution::translate(Expression const& _expression)
 {
diff --git a/libyul/optimiser/Substitution.h b/libyul/optimiser/Substitution.h
index 6a0679f5..41f73b92 100644
--- a/libyul/optimiser/Substitution.h
+++ b/libyul/optimiser/Substitution.h
@@ -25,8 +25,6 @@
 
 #include <map>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -46,4 +44,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/Suite.cpp b/libyul/optimiser/Suite.cpp
index b6920633..36f0e1eb 100644
--- a/libyul/optimiser/Suite.cpp
+++ b/libyul/optimiser/Suite.cpp
@@ -43,11 +43,11 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 void OptimiserSuite::run(
 	Block& _ast,
-	solidity::assembly::AsmAnalysisInfo const& _analysisInfo,
+	AsmAnalysisInfo const& _analysisInfo,
 	set<YulString> const& _externallyUsedIdentifiers
 )
 {
diff --git a/libyul/optimiser/Suite.h b/libyul/optimiser/Suite.h
index 5b564c56..3f23ee9f 100644
--- a/libyul/optimiser/Suite.h
+++ b/libyul/optimiser/Suite.h
@@ -25,18 +25,11 @@
 
 #include <set>
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
-{
-struct AsmAnalysisInfo;
-}
-}
 namespace yul
 {
 
+struct AsmAnalysisInfo;
+
 /**
  * Optimiser suite that combines all steps and also provides the settings for the heuristics
  */
@@ -45,11 +38,10 @@ class OptimiserSuite
 public:
 	static void run(
 		Block& _ast,
-		solidity::assembly::AsmAnalysisInfo const& _analysisInfo,
+		AsmAnalysisInfo const& _analysisInfo,
 
 		std::set<YulString> const& _externallyUsedIdentifiers = {}
 	);
 };
 
 }
-}
diff --git a/libyul/optimiser/SyntacticalEquality.cpp b/libyul/optimiser/SyntacticalEquality.cpp
index ff4ff81b..99ce06e5 100644
--- a/libyul/optimiser/SyntacticalEquality.cpp
+++ b/libyul/optimiser/SyntacticalEquality.cpp
@@ -27,7 +27,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 bool SyntacticalEqualityChecker::equal(Expression const& _e1, Expression const& _e2)
 {
diff --git a/libyul/optimiser/SyntacticalEquality.h b/libyul/optimiser/SyntacticalEquality.h
index e9fbebe0..46527a66 100644
--- a/libyul/optimiser/SyntacticalEquality.h
+++ b/libyul/optimiser/SyntacticalEquality.h
@@ -24,8 +24,6 @@
 
 #include <vector>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -47,4 +45,3 @@ protected:
 };
 
 }
-}
diff --git a/libyul/optimiser/UnusedPruner.cpp b/libyul/optimiser/UnusedPruner.cpp
index 484e7475..31aead82 100644
--- a/libyul/optimiser/UnusedPruner.cpp
+++ b/libyul/optimiser/UnusedPruner.cpp
@@ -30,7 +30,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
 UnusedPruner::UnusedPruner(Block& _ast, set<YulString> const& _externallyUsedFunctions)
 {
diff --git a/libyul/optimiser/UnusedPruner.h b/libyul/optimiser/UnusedPruner.h
index b5b46443..64e02b35 100644
--- a/libyul/optimiser/UnusedPruner.h
+++ b/libyul/optimiser/UnusedPruner.h
@@ -26,8 +26,6 @@
 #include <map>
 #include <set>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -62,4 +60,3 @@ private:
 };
 
 }
-}
diff --git a/libyul/optimiser/Utilities.cpp b/libyul/optimiser/Utilities.cpp
index e41fd15d..b8cdd339 100644
--- a/libyul/optimiser/Utilities.cpp
+++ b/libyul/optimiser/Utilities.cpp
@@ -28,9 +28,9 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
+using namespace yul;
 
-void dev::yul::removeEmptyBlocks(Block& _block)
+void yul::removeEmptyBlocks(Block& _block)
 {
 	auto isEmptyBlock = [](Statement const& _st) -> bool {
 		return _st.type() == typeid(Block) && boost::get<Block>(_st).statements.empty();
diff --git a/libyul/optimiser/Utilities.h b/libyul/optimiser/Utilities.h
index 5b18a27c..11c9fa19 100644
--- a/libyul/optimiser/Utilities.h
+++ b/libyul/optimiser/Utilities.h
@@ -22,8 +22,6 @@
 
 #include <libyul/ASTDataForward.h>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -31,4 +29,3 @@ namespace yul
 void removeEmptyBlocks(Block& _block);
 
 }
-}
diff --git a/libyul/optimiser/VarDeclPropagator.cpp b/libyul/optimiser/VarDeclPropagator.cpp
index 855b8215..bf974f44 100644
--- a/libyul/optimiser/VarDeclPropagator.cpp
+++ b/libyul/optimiser/VarDeclPropagator.cpp
@@ -24,10 +24,7 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
-
-using dev::solidity::assembly::TypedName;
-using dev::solidity::assembly::TypedNameList;
+using namespace yul;
 
 void VarDeclPropagator::operator()(Block& _block)
 {
diff --git a/libyul/optimiser/VarDeclPropagator.h b/libyul/optimiser/VarDeclPropagator.h
index ffecd217..7a68d326 100644
--- a/libyul/optimiser/VarDeclPropagator.h
+++ b/libyul/optimiser/VarDeclPropagator.h
@@ -25,8 +25,6 @@
 #include <set>
 #include <map>
 
-namespace dev
-{
 namespace yul
 {
 
@@ -60,4 +58,3 @@ private:
 };
 
 }
-}
diff --git a/test/boostTest.cpp b/test/boostTest.cpp
index 5352ef85..966badfc 100644
--- a/test/boostTest.cpp
+++ b/test/boostTest.cpp
@@ -143,7 +143,7 @@ test_suite* init_unit_test_suite( int /*argc*/, char* /*argv*/[] )
 		master,
 		dev::test::Options::get().testPath / "libyul",
 		"yulOptimizerTests",
-		dev::yul::test::YulOptimizerTest::create
+		yul::test::YulOptimizerTest::create
 	) > 0, "no Yul Optimizer tests found");
 	if (!dev::test::Options::get().disableSMT)
 		solAssert(registerTests(
diff --git a/test/libyul/Common.cpp b/test/libyul/Common.cpp
index 5851555a..d7785287 100644
--- a/test/libyul/Common.cpp
+++ b/test/libyul/Common.cpp
@@ -37,10 +37,10 @@
 
 using namespace std;
 using namespace langutil;
-using namespace dev::yul;
+using namespace yul;
 using namespace dev::solidity;
 
-void dev::yul::test::printErrors(ErrorList const& _errors, Scanner const& _scanner)
+void yul::test::printErrors(ErrorList const& _errors, Scanner const& _scanner)
 {
 	SourceReferenceFormatter formatter(cout, [&](std::string const&) -> Scanner const& { return _scanner; });
 
@@ -52,18 +52,18 @@ void dev::yul::test::printErrors(ErrorList const& _errors, Scanner const& _scann
 }
 
 
-pair<shared_ptr<Block>, shared_ptr<assembly::AsmAnalysisInfo>> dev::yul::test::parse(string const& _source, bool _yul)
+pair<shared_ptr<Block>, shared_ptr<yul::AsmAnalysisInfo>> yul::test::parse(string const& _source, bool _yul)
 {
-	auto flavour = _yul ? assembly::AsmFlavour::Yul : assembly::AsmFlavour::Strict;
+	auto flavour = _yul ? yul::AsmFlavour::Yul : yul::AsmFlavour::Strict;
 	ErrorList errors;
 	ErrorReporter errorReporter(errors);
 	auto scanner = make_shared<Scanner>(CharStream(_source), "");
-	auto parserResult = assembly::Parser(errorReporter, flavour).parse(scanner, false);
+	auto parserResult = yul::Parser(errorReporter, flavour).parse(scanner, false);
 	if (parserResult)
 	{
 		BOOST_REQUIRE(errorReporter.errors().empty());
-		auto analysisInfo = make_shared<assembly::AsmAnalysisInfo>();
-		assembly::AsmAnalyzer analyzer(
+		auto analysisInfo = make_shared<yul::AsmAnalysisInfo>();
+		yul::AsmAnalyzer analyzer(
 			*analysisInfo,
 			errorReporter,
 			dev::test::Options::get().evmVersion(),
@@ -83,13 +83,13 @@ pair<shared_ptr<Block>, shared_ptr<assembly::AsmAnalysisInfo>> dev::yul::test::p
 	return {};
 }
 
-assembly::Block dev::yul::test::disambiguate(string const& _source, bool _yul)
+yul::Block yul::test::disambiguate(string const& _source, bool _yul)
 {
 	auto result = parse(_source, _yul);
 	return boost::get<Block>(Disambiguator(*result.second, {})(*result.first));
 }
 
-string dev::yul::test::format(string const& _source, bool _yul)
+string yul::test::format(string const& _source, bool _yul)
 {
-	return assembly::AsmPrinter(_yul)(*parse(_source, _yul).first);
+	return yul::AsmPrinter(_yul)(*parse(_source, _yul).first);
 }
diff --git a/test/libyul/Common.h b/test/libyul/Common.h
index 8241bfe1..a1c64ca5 100644
--- a/test/libyul/Common.h
+++ b/test/libyul/Common.h
@@ -34,26 +34,21 @@ class Error;
 using ErrorList = std::vector<std::shared_ptr<Error const>>;
 }
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 struct AsmAnalysisInfo;
 }
-}
+
 namespace yul
 {
 namespace test
 {
 
 void printErrors(langutil::ErrorList const& _errors, langutil::Scanner const& _scanner);
-std::pair<std::shared_ptr<solidity::assembly::Block>, std::shared_ptr<solidity::assembly::AsmAnalysisInfo>>
+std::pair<std::shared_ptr<Block>, std::shared_ptr<AsmAnalysisInfo>>
 parse(std::string const& _source, bool _yul = true);
-solidity::assembly::Block disambiguate(std::string const& _source, bool _yul = true);
+Block disambiguate(std::string const& _source, bool _yul = true);
 std::string format(std::string const& _source, bool _yul = true);
 
 }
 }
-}
diff --git a/test/libyul/Inliner.cpp b/test/libyul/Inliner.cpp
index 0f82dee3..631cda08 100644
--- a/test/libyul/Inliner.cpp
+++ b/test/libyul/Inliner.cpp
@@ -35,8 +35,8 @@
 
 using namespace std;
 using namespace dev;
-using namespace dev::yul;
-using namespace dev::yul::test;
+using namespace yul;
+using namespace yul::test;
 using namespace dev::solidity;
 
 namespace
diff --git a/test/libyul/Parser.cpp b/test/libyul/Parser.cpp
index 957973d0..6f946362 100644
--- a/test/libyul/Parser.cpp
+++ b/test/libyul/Parser.cpp
@@ -36,11 +36,10 @@
 #include <memory>
 
 using namespace std;
+using namespace dev;
 using namespace langutil;
 
-namespace dev
-{
-namespace solidity
+namespace yul
 {
 namespace test
 {
@@ -53,16 +52,16 @@ bool parse(string const& _source, ErrorReporter& errorReporter)
 	try
 	{
 		auto scanner = make_shared<Scanner>(CharStream(_source));
-		auto parserResult = assembly::Parser(errorReporter, assembly::AsmFlavour::Yul).parse(scanner, false);
+		auto parserResult = yul::Parser(errorReporter, yul::AsmFlavour::Yul).parse(scanner, false);
 		if (parserResult)
 		{
-			assembly::AsmAnalysisInfo analysisInfo;
-			return (assembly::AsmAnalyzer(
+			yul::AsmAnalysisInfo analysisInfo;
+			return (yul::AsmAnalyzer(
 				analysisInfo,
 				errorReporter,
 				dev::test::Options::get().evmVersion(),
 				boost::none,
-				assembly::AsmFlavour::Yul
+				yul::AsmFlavour::Yul
 			)).analyze(*parserResult);
 		}
 	}
@@ -117,7 +116,7 @@ do \
 { \
 	Error err = expectError((text), false); \
 	BOOST_CHECK(err.type() == (Error::Type::typ)); \
-	BOOST_CHECK(searchErrorMessage(err, (substring))); \
+	BOOST_CHECK(dev::solidity::searchErrorMessage(err, (substring))); \
 } while(0)
 
 BOOST_AUTO_TEST_SUITE(YulParser)
@@ -303,5 +302,4 @@ BOOST_AUTO_TEST_CASE(if_statement_invalid)
 BOOST_AUTO_TEST_SUITE_END()
 
 }
-}
 } // end namespaces
diff --git a/test/libyul/YulOptimizerTest.cpp b/test/libyul/YulOptimizerTest.cpp
index 02a63ae3..9c2da493 100644
--- a/test/libyul/YulOptimizerTest.cpp
+++ b/test/libyul/YulOptimizerTest.cpp
@@ -55,8 +55,8 @@
 
 using namespace dev;
 using namespace langutil;
-using namespace dev::yul;
-using namespace dev::yul::test;
+using namespace yul;
+using namespace yul::test;
 using namespace dev::solidity;
 using namespace dev::solidity::test;
 using namespace std;
@@ -92,9 +92,9 @@ YulOptimizerTest::YulOptimizerTest(string const& _filename)
 
 bool YulOptimizerTest::run(ostream& _stream, string const& _linePrefix, bool const _formatted)
 {
-	assembly::AsmPrinter printer{m_yul};
+	yul::AsmPrinter printer{m_yul};
 	shared_ptr<Block> ast;
-	shared_ptr<assembly::AsmAnalysisInfo> analysisInfo;
+	shared_ptr<yul::AsmAnalysisInfo> analysisInfo;
 	if (!parse(_stream, _linePrefix, _formatted))
 		return false;
 
@@ -256,19 +256,19 @@ void YulOptimizerTest::printIndented(ostream& _stream, string const& _output, st
 
 bool YulOptimizerTest::parse(ostream& _stream, string const& _linePrefix, bool const _formatted)
 {
-	assembly::AsmFlavour flavour = m_yul ? assembly::AsmFlavour::Yul : assembly::AsmFlavour::Strict;
+	yul::AsmFlavour flavour = m_yul ? yul::AsmFlavour::Yul : yul::AsmFlavour::Strict;
 	ErrorList errors;
 	ErrorReporter errorReporter(errors);
 	shared_ptr<Scanner> scanner = make_shared<Scanner>(CharStream(m_source), "");
-	m_ast = assembly::Parser(errorReporter, flavour).parse(scanner, false);
+	m_ast = yul::Parser(errorReporter, flavour).parse(scanner, false);
 	if (!m_ast || !errorReporter.errors().empty())
 	{
 		FormattedScope(_stream, _formatted, {formatting::BOLD, formatting::RED}) << _linePrefix << "Error parsing source." << endl;
 		printErrors(_stream, errorReporter.errors(), *scanner);
 		return false;
 	}
-	m_analysisInfo = make_shared<assembly::AsmAnalysisInfo>();
-	assembly::AsmAnalyzer analyzer(
+	m_analysisInfo = make_shared<yul::AsmAnalysisInfo>();
+	yul::AsmAnalyzer analyzer(
 		*m_analysisInfo,
 		errorReporter,
 		dev::test::Options::get().evmVersion(),
diff --git a/test/libyul/YulOptimizerTest.h b/test/libyul/YulOptimizerTest.h
index d11ff8fb..72c4299f 100644
--- a/test/libyul/YulOptimizerTest.h
+++ b/test/libyul/YulOptimizerTest.h
@@ -26,22 +26,18 @@ class Error;
 using ErrorList = std::vector<std::shared_ptr<Error const>>;
 }
 
-namespace dev
-{
-namespace solidity
-{
-namespace assembly
+namespace yul
 {
 struct AsmAnalysisInfo;
 struct Block;
 }
-}
+
 namespace yul
 {
 namespace test
 {
 
-class YulOptimizerTest: public solidity::test::TestCase
+class YulOptimizerTest: public dev::solidity::test::TestCase
 {
 public:
 	static std::unique_ptr<TestCase> create(std::string const& _filename)
@@ -68,11 +64,10 @@ private:
 	std::string m_optimizerStep;
 	std::string m_expectation;
 
-	std::shared_ptr<solidity::assembly::Block> m_ast;
-	std::shared_ptr<solidity::assembly::AsmAnalysisInfo> m_analysisInfo;
+	std::shared_ptr<Block> m_ast;
+	std::shared_ptr<AsmAnalysisInfo> m_analysisInfo;
 	std::string m_obtainedResult;
 };
 
 }
 }
-}
diff --git a/test/tools/yulopti.cpp b/test/tools/yulopti.cpp
index 4e916b49..7a147137 100644
--- a/test/tools/yulopti.cpp
+++ b/test/tools/yulopti.cpp
@@ -60,8 +60,7 @@ using namespace std;
 using namespace dev;
 using namespace langutil;
 using namespace dev::solidity;
-using namespace dev::solidity::assembly;
-using namespace dev::yul;
+using namespace yul;
 
 namespace po = boost::program_options;
 
@@ -83,14 +82,14 @@ public:
 	{
 		ErrorReporter errorReporter(m_errors);
 		shared_ptr<Scanner> scanner = make_shared<Scanner>(CharStream(_input), "");
-		m_ast = assembly::Parser(errorReporter, assembly::AsmFlavour::Strict).parse(scanner, false);
+		m_ast = yul::Parser(errorReporter, yul::AsmFlavour::Strict).parse(scanner, false);
 		if (!m_ast || !errorReporter.errors().empty())
 		{
 			cout << "Error parsing source." << endl;
 			printErrors(*scanner);
 			return false;
 		}
-		m_analysisInfo = make_shared<assembly::AsmAnalysisInfo>();
+		m_analysisInfo = make_shared<yul::AsmAnalysisInfo>();
 		AsmAnalyzer analyzer(
 			*m_analysisInfo,
 			errorReporter,
@@ -118,7 +117,7 @@ public:
 				return;
 			if (!disambiguated)
 			{
-				*m_ast = boost::get<assembly::Block>(Disambiguator(*m_analysisInfo)(*m_ast));
+				*m_ast = boost::get<yul::Block>(Disambiguator(*m_analysisInfo)(*m_ast));
 				m_analysisInfo.reset();
 				m_nameDispenser = make_shared<NameDispenser>(*m_ast);
 				disambiguated = true;
@@ -187,7 +186,7 @@ public:
 
 private:
 	ErrorList m_errors;
-	shared_ptr<assembly::Block> m_ast;
+	shared_ptr<yul::Block> m_ast;
 	shared_ptr<AsmAnalysisInfo> m_analysisInfo;
 	shared_ptr<NameDispenser> m_nameDispenser;
 };