More safeguards for (library) function types.

1 files changed, 11 insertions, 0 deletions

diff --git a/libsolidity/ast/Types.cpp b/libsolidity/ast/Types.cpp
index c9dca126..2fb5fba2 100644
--- a/libsolidity/ast/Types.cpp
+++ b/libsolidity/ast/Types.cpp
@@ -2924,6 +2924,17 @@ string FunctionType::externalSignature() const
 {
 	solAssert(m_declaration != nullptr, "External signature of function needs declaration");
 	solAssert(!m_declaration->name().empty(), "Fallback function has no signature.");
+	switch (kind())
+	{
+	case Kind::Internal:
+	case Kind::External:
+	case Kind::CallCode:
+	case Kind::DelegateCall:
+	case Kind::Event:
+		break;
+	default:
+		solAssert(false, "Invalid function type for requesting external signature.");
+	}
 
 	bool const inLibrary = dynamic_cast<ContractDefinition const&>(*m_declaration->scope()).isLibrary();
 	FunctionTypePointer external = interfaceFunctionType();