diff --git a/libsolidity/codegen/CompilerContext.cpp b/libsolidity/codegen/CompilerContext.cpp
index ef5534a3c..c57e4f8b0 100644
--- a/libsolidity/codegen/CompilerContext.cpp
+++ b/libsolidity/codegen/CompilerContext.cpp
@@ -387,7 +387,7 @@ void CompilerContext::appendInlineAssembly(
 	yul::EVMDialect const& dialect = yul::EVMDialect::strictAssemblyForEVM(m_evmVersion);
 	auto parserResult = yul::Parser(errorReporter, dialect).parse(scanner, false);
 #ifdef SOL_OUTPUT_ASM
-	cout << yul::AsmPrinter()(*parserResult) << endl;
+	cout << yul::AsmPrinter(&dialect)(*parserResult) << endl;
 #endif
 
 	auto reportError = [&](string const& _context)
@@ -438,7 +438,7 @@ void CompilerContext::appendInlineAssembly(
 
 #ifdef SOL_OUTPUT_ASM
 		cout << "After optimizer:" << endl;
-		cout << yul::AsmPrinter()(*parserResult) << endl;
+		cout << yul::AsmPrinter(&dialect)(*parserResult) << endl;
 #endif
 	}
 
diff --git a/libsolidity/codegen/ir/IRGeneratorForStatements.cpp b/libsolidity/codegen/ir/IRGeneratorForStatements.cpp
index fe3e2a7ef..16c11e3e7 100644
--- a/libsolidity/codegen/ir/IRGeneratorForStatements.cpp
+++ b/libsolidity/codegen/ir/IRGeneratorForStatements.cpp
@@ -892,6 +892,7 @@ bool IRGeneratorForStatements::visit(InlineAssembly const& _inlineAsm)
 
 	solAssert(holds_alternative<yul::Block>(modified), "");
 
+	// Do not provide dialect so that we get the full type information.
 	m_code << yul::AsmPrinter()(std::get<yul::Block>(std::move(modified))) << "\n";
 	return false;
 }
diff --git a/libyul/AsmAnalysis.cpp b/libyul/AsmAnalysis.cpp
index 148eeabfe..a117f8cd9 100644
--- a/libyul/AsmAnalysis.cpp
+++ b/libyul/AsmAnalysis.cpp
@@ -608,7 +608,7 @@ Scope& AsmAnalyzer::scope(Block const* _block)
 }
 void AsmAnalyzer::expectValidType(YulString _type, SourceLocation const& _location)
 {
-	if (!_type.empty() && !contains(m_dialect.types, _type))
+	if (!_type.empty() && !m_dialect.types.count(_type))
 		m_errorReporter.typeError(
 			_location,
 			"\"" + _type.str() + "\" is not a valid type (user defined types are not yet supported)."
diff --git a/libyul/AsmParser.cpp b/libyul/AsmParser.cpp
index 3b955b96f..fcfb46261 100644
--- a/libyul/AsmParser.cpp
+++ b/libyul/AsmParser.cpp
@@ -366,7 +366,7 @@ Parser::ElementaryOperation Parser::parseElementaryOperation()
 			location(),
 			kind,
 			YulString{currentLiteral()},
-			{}
+			kind == LiteralKind::Boolean ? m_dialect.boolType : m_dialect.defaultType
 		};
 		advance();
 		if (currentToken() == Token::Colon)
@@ -497,6 +497,9 @@ TypedName Parser::parseTypedName()
 		typedName.location.end = endPosition();
 		typedName.type = expectAsmIdentifier();
 	}
+	else
+		typedName.type = m_dialect.defaultType;
+
 	return typedName;
 }
 
diff --git a/libyul/AsmPrinter.cpp b/libyul/AsmPrinter.cpp
index a62db6123..671a0fa24 100644
--- a/libyul/AsmPrinter.cpp
+++ b/libyul/AsmPrinter.cpp
@@ -23,6 +23,7 @@
 #include <libyul/AsmPrinter.h>
 #include <libyul/AsmData.h>
 #include <libyul/Exceptions.h>
+#include <libyul/Dialect.h>
 
 #include <libsolutil/CommonData.h>
 
@@ -238,7 +239,8 @@ string AsmPrinter::formatTypedName(TypedName _variable) const
 
 string AsmPrinter::appendTypeName(YulString _type) const
 {
-	if (!_type.empty())
+	if (_type.empty() || (m_dialect && _type == m_dialect->defaultType))
+		return {};
+	else
 		return ":" + _type.str();
-	return "";
 }
diff --git a/libyul/AsmPrinter.h b/libyul/AsmPrinter.h
index 30569922d..9edc3a7c3 100644
--- a/libyul/AsmPrinter.h
+++ b/libyul/AsmPrinter.h
@@ -30,10 +30,16 @@ namespace solidity::yul
 {
 struct Dialect;
 
+/**
+ * Converts a parsed Yul AST into readable string representation.
+ * Ignores source locations.
+ * If a dialect is provided, the dialect's default type is omitted.
+ */
 class AsmPrinter
 {
 public:
-	explicit AsmPrinter() {}
+	AsmPrinter() {}
+	explicit AsmPrinter(Dialect const& _dialect): m_dialect(&_dialect) {}
 
 	std::string operator()(Literal const& _literal) const;
 	std::string operator()(Identifier const& _identifier) const;
@@ -53,6 +59,8 @@ public:
 private:
 	std::string formatTypedName(TypedName _variable) const;
 	std::string appendTypeName(YulString _type) const;
+
+	Dialect const* m_dialect = nullptr;
 };
 
 }
diff --git a/libyul/Dialect.h b/libyul/Dialect.h
index b96e1851c..f08a04e65 100644
--- a/libyul/Dialect.h
+++ b/libyul/Dialect.h
@@ -51,7 +51,7 @@ struct Dialect: boost::noncopyable
 	YulString defaultType;
 	/// Type used for the literals "true" and "false".
 	YulString boolType;
-	std::vector<YulString> types;
+	std::set<YulString> types;
 
 	/// @returns the builtin function of the given name or a nullptr if it is not a builtin function.
 	virtual BuiltinFunction const* builtin(YulString /*_name*/) const { return nullptr; }
diff --git a/libyul/backends/evm/EVMDialect.cpp b/libyul/backends/evm/EVMDialect.cpp
index 399445efa..baab0a268 100644
--- a/libyul/backends/evm/EVMDialect.cpp
+++ b/libyul/backends/evm/EVMDialect.cpp
@@ -218,6 +218,9 @@ EVMDialectTyped::EVMDialectTyped(langutil::EVMVersion _evmVersion, bool _objectA
 	EVMDialect(_evmVersion, _objectAccess)
 {
 	defaultType = "u256"_yulstring;
+	boolType = "bool"_yulstring;
+	types = {defaultType, boolType};
+
 	m_functions["lt"_yulstring].returns = {"bool"_yulstring};
 	m_functions["gt"_yulstring].returns = {"bool"_yulstring};
 	m_functions["slt"_yulstring].returns = {"bool"_yulstring};
diff --git a/test/libyul/YulOptimizerTest.cpp b/test/libyul/YulOptimizerTest.cpp
index 609473acc..44be41fc4 100644
--- a/test/libyul/YulOptimizerTest.cpp
+++ b/test/libyul/YulOptimizerTest.cpp
@@ -365,7 +365,7 @@ TestCase::TestResult YulOptimizerTest::run(ostream& _stream, string const& _line
 		return TestResult::FatalError;
 	}
 
-	m_obtainedResult = AsmPrinter{}(*m_ast) + "\n";
+	m_obtainedResult = AsmPrinter{*m_dialect}(*m_ast) + "\n";
 
 	if (m_optimizerStep != m_validatedSettings["step"])
 	{
diff --git a/test/tools/yulopti.cpp b/test/tools/yulopti.cpp
index 23e535734..998c25bae 100644
--- a/test/tools/yulopti.cpp
+++ b/test/tools/yulopti.cpp
@@ -248,7 +248,7 @@ public:
 			default:
 				cout << "Unknown option." << endl;
 			}
-			source = AsmPrinter{}(*m_ast);
+			source = AsmPrinter{m_dialect}(*m_ast);
 		}
 	}