diff --git a/liblangutil/ParserBase.h b/liblangutil/ParserBase.h
index 098826f1c..d75a97707 100644
--- a/liblangutil/ParserBase.h
+++ b/liblangutil/ParserBase.h
@@ -33,6 +33,7 @@ namespace solidity::langutil
 
 class ErrorReporter;
 class Scanner;
+struct SourceLocation;
 struct ErrorId;
 
 class ParserBase
diff --git a/liblangutil/Scanner.h b/liblangutil/Scanner.h
index ef12703ef..347c75779 100644
--- a/liblangutil/Scanner.h
+++ b/liblangutil/Scanner.h
@@ -55,8 +55,6 @@
 #include <liblangutil/Token.h>
 #include <liblangutil/CharStream.h>
 #include <liblangutil/SourceLocation.h>
-#include <libsolutil/Common.h>
-#include <libsolutil/CommonData.h>
 
 #include <optional>
 #include <iosfwd>
diff --git a/liblangutil/SemVerHandler.cpp b/liblangutil/SemVerHandler.cpp
index af408789c..ede1cd7be 100644
--- a/liblangutil/SemVerHandler.cpp
+++ b/liblangutil/SemVerHandler.cpp
@@ -23,12 +23,20 @@
 
 #include <liblangutil/SemVerHandler.h>
 
+#include <liblangutil/Exceptions.h>
+
 #include <functional>
 
 using namespace std;
 using namespace solidity;
 using namespace solidity::langutil;
 
+SemVerMatchExpressionParser::SemVerMatchExpressionParser(vector<Token> _tokens, vector<string> _literals):
+	m_tokens(std::move(_tokens)), m_literals(std::move(_literals))
+{
+	solAssert(m_tokens.size() == m_literals.size(), "");
+}
+
 SemVerVersion::SemVerVersion(string const& _versionString)
 {
 	auto i = _versionString.begin();
diff --git a/liblangutil/SemVerHandler.h b/liblangutil/SemVerHandler.h
index 0c4f57a03..bce4d736b 100644
--- a/liblangutil/SemVerHandler.h
+++ b/liblangutil/SemVerHandler.h
@@ -85,11 +85,7 @@ struct SemVerMatchExpression
 class SemVerMatchExpressionParser
 {
 public:
-	SemVerMatchExpressionParser(std::vector<Token> _tokens, std::vector<std::string> _literals):
-		m_tokens(std::move(_tokens)), m_literals(std::move(_literals))
-	{
-		solAssert(m_tokens.size() == m_literals.size(), "");
-	}
+	SemVerMatchExpressionParser(std::vector<Token> _tokens, std::vector<std::string> _literals);
 
 	/// Returns an expression if it was parseable, or nothing otherwise.
 	std::optional<SemVerMatchExpression> parse();
diff --git a/liblangutil/SourceLocation.cpp b/liblangutil/SourceLocation.cpp
index 058cc6b57..72f2506e8 100644
--- a/liblangutil/SourceLocation.cpp
+++ b/liblangutil/SourceLocation.cpp
@@ -21,6 +21,8 @@
 #include <boost/algorithm/string/split.hpp>
 #include <boost/algorithm/string.hpp>
 
+#include <iostream>
+
 using namespace solidity;
 using namespace solidity::langutil;
 using namespace std;
@@ -50,3 +52,16 @@ SourceLocation solidity::langutil::parseSourceLocation(string const& _input, vec
 		result.sourceName = _sourceNames.at(static_cast<size_t>(sourceIndex));
 	return result;
 }
+
+std::ostream& solidity::langutil::operator<<(std::ostream& _out, SourceLocation const& _location)
+{
+	if (!_location.isValid())
+		return _out << "NO_LOCATION_SPECIFIED";
+
+	if (_location.sourceName)
+		_out << *_location.sourceName;
+
+	_out << "[" << _location.start << "," << _location.end << "]";
+
+	return _out;
+}
diff --git a/liblangutil/SourceLocation.h b/liblangutil/SourceLocation.h
index 845b269ca..66cef52fb 100644
--- a/liblangutil/SourceLocation.h
+++ b/liblangutil/SourceLocation.h
@@ -23,16 +23,14 @@
 
 #pragma once
 
-#include <libsolutil/Assertions.h>
-#include <libsolutil/Exceptions.h>
-
-#include <limits>
+#include <iosfwd>
 #include <memory>
 #include <string>
+#include <tuple>
+#include <vector>
 
 namespace solidity::langutil
 {
-struct SourceLocationError: virtual util::Exception {};
 
 /**
  * Representation of an interval of source positions.
@@ -112,17 +110,6 @@ SourceLocation parseSourceLocation(
 );
 
 /// Stream output for Location (used e.g. in boost exceptions).
-inline std::ostream& operator<<(std::ostream& _out, SourceLocation const& _location)
-{
-	if (!_location.isValid())
-		return _out << "NO_LOCATION_SPECIFIED";
-
-	if (_location.sourceName)
-		_out << *_location.sourceName;
-
-	_out << "[" << _location.start << "," << _location.end << "]";
-
-	return _out;
-}
+std::ostream& operator<<(std::ostream& _out, SourceLocation const& _location);
 
 }
diff --git a/liblangutil/SourceReferenceFormatter.cpp b/liblangutil/SourceReferenceFormatter.cpp
index 2a0799036..20d0f3306 100644
--- a/liblangutil/SourceReferenceFormatter.cpp
+++ b/liblangutil/SourceReferenceFormatter.cpp
@@ -21,6 +21,8 @@
 
 #include <liblangutil/SourceReferenceFormatter.h>
 #include <liblangutil/Exceptions.h>
+#include <liblangutil/CharStream.h>
+#include <liblangutil/CharStreamProvider.h>
 #include <libsolutil/UTF8.h>
 #include <iomanip>
 #include <string_view>
@@ -45,6 +47,14 @@ std::string replaceNonTabs(std::string_view _utf8Input, char _filler)
 
 }
 
+std::string SourceReferenceFormatter::formatErrorInformation(Error const& _error, CharStream const& _charStream)
+{
+	return formatErrorInformation(
+		_error,
+		SingletonCharStreamProvider(_charStream)
+	);
+}
+
 AnsiColorized SourceReferenceFormatter::normalColored() const
 {
 	return AnsiColorized(m_stream, m_colored, {WHITE});
diff --git a/liblangutil/SourceReferenceFormatter.h b/liblangutil/SourceReferenceFormatter.h
index 630f00de5..fc1f418a2 100644
--- a/liblangutil/SourceReferenceFormatter.h
+++ b/liblangutil/SourceReferenceFormatter.h
@@ -23,7 +23,6 @@
 
 #include <liblangutil/Exceptions.h>
 #include <liblangutil/SourceReferenceExtractor.h>
-#include <liblangutil/CharStreamProvider.h>
 
 #include <libsolutil/AnsiColorized.h>
 
@@ -33,6 +32,9 @@
 
 namespace solidity::langutil
 {
+
+class CharStream;
+class CharStreamProvider;
 struct SourceLocation;
 
 class SourceReferenceFormatter
@@ -80,13 +82,7 @@ public:
 		);
 	}
 
-	static std::string formatErrorInformation(Error const& _error, CharStream const& _charStream)
-	{
-		return formatErrorInformation(
-			_error,
-			SingletonCharStreamProvider(_charStream)
-		);
-	}
+	static std::string formatErrorInformation(Error const& _error, CharStream const& _charStream);
 
 private:
 	util::AnsiColorized normalColored() const;
diff --git a/liblangutil/Token.cpp b/liblangutil/Token.cpp
index b6cb1e0ed..8bdaff1fd 100644
--- a/liblangutil/Token.cpp
+++ b/liblangutil/Token.cpp
@@ -41,6 +41,7 @@
 // along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <liblangutil/Token.h>
+#include <liblangutil/Exceptions.h>
 #include <map>
 
 using namespace std;
@@ -48,6 +49,24 @@ using namespace std;
 namespace solidity::langutil
 {
 
+Token TokenTraits::AssignmentToBinaryOp(Token op)
+{
+	solAssert(isAssignmentOp(op) && op != Token::Assign, "");
+	return static_cast<Token>(static_cast<int>(op) + (static_cast<int>(Token::BitOr) - static_cast<int>(Token::AssignBitOr)));
+}
+
+std::string ElementaryTypeNameToken::toString(bool const& tokenValue) const
+{
+	std::string name = TokenTraits::toString(m_token);
+	if (tokenValue || (firstNumber() == 0 && secondNumber() == 0))
+		return name;
+	solAssert(name.size() >= 3, "Token name size should be greater than 3. Should not reach here.");
+	if (m_token == Token::FixedMxN || m_token == Token::UFixedMxN)
+		return name.substr(0, name.size() - 3) + std::to_string(m_firstNumber) + "x" + std::to_string(m_secondNumber);
+	else
+		return name.substr(0, name.size() - 1) + std::to_string(m_firstNumber);
+}
+
 void ElementaryTypeNameToken::assertDetails(Token _baseType, unsigned const& _first, unsigned const& _second)
 {
 	solAssert(TokenTraits::isElementaryTypeName(_baseType), "Expected elementary type name: " + string(TokenTraits::toString(_baseType)));
diff --git a/liblangutil/Token.h b/liblangutil/Token.h
index 13f836589..eb8015f4d 100644
--- a/liblangutil/Token.h
+++ b/liblangutil/Token.h
@@ -42,8 +42,6 @@
 
 #pragma once
 
-#include <libsolutil/Common.h>
-#include <liblangutil/Exceptions.h>
 #include <liblangutil/UndefMacros.h>
 
 #include <iosfwd>
@@ -329,11 +327,7 @@ namespace TokenTraits
 
 	bool isYulKeyword(std::string const& _literal);
 
-	inline Token AssignmentToBinaryOp(Token op)
-	{
-		solAssert(isAssignmentOp(op) && op != Token::Assign, "");
-		return static_cast<Token>(static_cast<int>(op) + (static_cast<int>(Token::BitOr) - static_cast<int>(Token::AssignBitOr)));
-	}
+	Token AssignmentToBinaryOp(Token op);
 
 	// @returns the precedence > 0 for binary and compare
 	// operators; returns 0 otherwise.
@@ -393,17 +387,7 @@ public:
 	Token token() const { return m_token; }
 
 	///if tokValue is set to true, then returns the actual token type name, otherwise, returns full type
-	std::string toString(bool const& tokenValue = false) const
-	{
-		std::string name = TokenTraits::toString(m_token);
-		if (tokenValue || (firstNumber() == 0 && secondNumber() == 0))
-			return name;
-		solAssert(name.size() >= 3, "Token name size should be greater than 3. Should not reach here.");
-		if (m_token == Token::FixedMxN || m_token == Token::UFixedMxN)
-			return name.substr(0, name.size() - 3) + std::to_string(m_firstNumber) + "x" + std::to_string(m_secondNumber);
-		else
-			return name.substr(0, name.size() - 1) + std::to_string(m_firstNumber);
-	}
+	std::string toString(bool const& tokenValue = false) const;
 
 private:
 	Token m_token;
diff --git a/libyul/AsmJsonImporter.cpp b/libyul/AsmJsonImporter.cpp
index 87ce31497..0c4273aa7 100644
--- a/libyul/AsmJsonImporter.cpp
+++ b/libyul/AsmJsonImporter.cpp
@@ -26,6 +26,7 @@
 #include <libyul/AST.h>
 #include <libyul/Exceptions.h>
 
+#include <liblangutil/Exceptions.h>
 #include <liblangutil/Scanner.h>
 
 #include <boost/algorithm/string/split.hpp>
diff --git a/libyul/AsmParser.cpp b/libyul/AsmParser.cpp
index e8f5b3e4e..b5e542926 100644
--- a/libyul/AsmParser.cpp
+++ b/libyul/AsmParser.cpp
@@ -24,8 +24,9 @@
 #include <libyul/AST.h>
 #include <libyul/AsmParser.h>
 #include <libyul/Exceptions.h>
-#include <liblangutil/Scanner.h>
 #include <liblangutil/ErrorReporter.h>
+#include <liblangutil/Exceptions.h>
+#include <liblangutil/Scanner.h>
 #include <libsolutil/Common.h>
 #include <libsolutil/Visitor.h>
 
@@ -70,6 +71,20 @@ optional<int> toInt(string const& _value)
 
 }
 
+std::shared_ptr<DebugData const> Parser::createDebugData() const
+{
+	switch (m_useSourceLocationFrom)
+	{
+		case UseSourceLocationFrom::Scanner:
+			return DebugData::create(ParserBase::currentLocation());
+		case UseSourceLocationFrom::LocationOverride:
+			return DebugData::create(m_locationOverride);
+		case UseSourceLocationFrom::Comments:
+			return m_debugDataOverride;
+	}
+	solAssert(false, "");
+}
+
 unique_ptr<Block> Parser::parse(std::shared_ptr<Scanner> const& _scanner, bool _reuseScanner)
 {
 	m_recursionDepth = 0;
diff --git a/libyul/AsmParser.h b/libyul/AsmParser.h
index 23ee935e5..3f1f30963 100644
--- a/libyul/AsmParser.h
+++ b/libyul/AsmParser.h
@@ -31,6 +31,7 @@
 #include <liblangutil/Scanner.h>
 #include <liblangutil/ParserBase.h>
 
+#include <map>
 #include <memory>
 #include <variant>
 #include <vector>
@@ -103,19 +104,7 @@ protected:
 	void fetchSourceLocationFromComment();
 
 	/// Creates a DebugData object with the correct source location set.
-	std::shared_ptr<DebugData const> createDebugData() const
-	{
-		switch (m_useSourceLocationFrom)
-		{
-			case UseSourceLocationFrom::Scanner:
-				return DebugData::create(ParserBase::currentLocation());
-			case UseSourceLocationFrom::LocationOverride:
-				return DebugData::create(m_locationOverride);
-			case UseSourceLocationFrom::Comments:
-				return m_debugDataOverride;
-		}
-		solAssert(false, "");
-	}
+	std::shared_ptr<DebugData const> createDebugData() const;
 
 	/// Creates an inline assembly node with the current source location.
 	template <class T> T createWithLocation() const
diff --git a/test/libyul/YulOptimizerTest.cpp b/test/libyul/YulOptimizerTest.cpp
index 3454f09ac..ada942152 100644
--- a/test/libyul/YulOptimizerTest.cpp
+++ b/test/libyul/YulOptimizerTest.cpp
@@ -27,6 +27,7 @@
 #include <libyul/optimiser/ReasoningBasedSimplifier.h>
 #include <libyul/AsmPrinter.h>
 
+#include <liblangutil/CharStreamProvider.h>
 #include <liblangutil/SourceReferenceFormatter.h>
 #include <liblangutil/Scanner.h>
 
diff --git a/tools/yulPhaser/Phaser.cpp b/tools/yulPhaser/Phaser.cpp
index db7d79c31..30d3b8876 100644
--- a/tools/yulPhaser/Phaser.cpp
+++ b/tools/yulPhaser/Phaser.cpp
@@ -27,6 +27,7 @@
 #include <tools/yulPhaser/SimulationRNG.h>
 
 #include <liblangutil/CharStream.h>
+#include <liblangutil/CharStreamProvider.h>
 #include <liblangutil/SourceReferenceFormatter.h>
 #include <liblangutil/Scanner.h>