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diff --git a/test/libyul/Common.cpp b/test/libyul/Common.cpp
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+/*
+    This file is part of solidity.
+
+    solidity is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    solidity is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @date 2017
+ * Common functions the Yul tests.
+ */
+
+#include <test/libyul/Common.h>
+
+#include <test/Options.h>
+
+#include <libyul/optimiser/Disambiguator.h>
+
+#include <libsolidity/parsing/Scanner.h>
+
+#include <libsolidity/inlineasm/AsmParser.h>
+#include <libsolidity/inlineasm/AsmAnalysis.h>
+#include <libsolidity/inlineasm/AsmPrinter.h>
+
+#include <libsolidity/interface/SourceReferenceFormatter.h>
+#include <libsolidity/interface/ErrorReporter.h>
+
+#include <boost/test/unit_test.hpp>
+
+using namespace std;
+using namespace dev::yul;
+using namespace dev::solidity;
+
+void dev::yul::test::printErrors(ErrorList const& _errors, Scanner const& _scanner)
+{
+	SourceReferenceFormatter formatter(cout, [&](std::string const&) -> Scanner const& { return _scanner; });
+
+	for (auto const& error: _errors)
+		formatter.printExceptionInformation(
+			*error,
+			(error->type() == Error::Type::Warning) ? "Warning" : "Error"
+		);
+}
+
+
+pair<shared_ptr<Block>, shared_ptr<assembly::AsmAnalysisInfo>> dev::yul::test::parse(string const& _source, bool _yul)
+{
+	auto flavour = _yul ? assembly::AsmFlavour::Yul : assembly::AsmFlavour::Strict;
+	ErrorList errors;
+	ErrorReporter errorReporter(errors);
+	auto scanner = make_shared<Scanner>(CharStream(_source), "");
+	auto parserResult = assembly::Parser(errorReporter, flavour).parse(scanner, false);
+	if (parserResult)
+	{
+		BOOST_REQUIRE(errorReporter.errors().empty());
+		auto analysisInfo = make_shared<assembly::AsmAnalysisInfo>();
+		assembly::AsmAnalyzer analyzer(
+			*analysisInfo,
+			errorReporter,
+			dev::test::Options::get().evmVersion(),
+			boost::none,
+			flavour
+		);
+		if (analyzer.analyze(*parserResult))
+		{
+			BOOST_REQUIRE(errorReporter.errors().empty());
+			return make_pair(parserResult, analysisInfo);
+		}
+	}
+	printErrors(errors, *scanner);
+	BOOST_FAIL("Invalid source.");
+
+	// Unreachable.
+	return {};
+}
+
+assembly::Block dev::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)
+{
+	return assembly::AsmPrinter(_yul)(*parse(_source, _yul).first);
+}