Index: src/SynTree/Expression.cc
===================================================================
--- src/SynTree/Expression.cc	(revision c0bf94ec8b5f4f0f6a4ac9de014bc1d596f29233)
+++ src/SynTree/Expression.cc	(revision b03eed6a17a1fe2f04d90bcdc9417eaddbcac5c7)
@@ -299,4 +299,33 @@
 }
 
+KeywordCastExpr::KeywordCastExpr( Expression *arg, Target target ) : Expression(), arg(arg), target( target ) {
+}
+
+KeywordCastExpr::KeywordCastExpr( const KeywordCastExpr &other ) : Expression( other ), arg( maybeClone( other.arg ) ), target( other.target ) {
+}
+
+KeywordCastExpr::~KeywordCastExpr() {
+	delete arg;
+}
+
+const std::string & KeywordCastExpr::targetString() const {
+	static const std::string targetStrs[] = {
+		"coroutine", "thread", "monitor"
+	};
+	static_assert(
+		(sizeof(targetStrs) / sizeof(targetStrs[0])) == ((unsigned long)NUMBER_OF_TARGETS),
+		"Each KeywordCastExpr::Target should have a corresponding string representation"
+	);
+	return targetStrs[(unsigned long)target];
+}
+
+void KeywordCastExpr::print( std::ostream &os, Indenter indent ) const {
+	os << "Keyword Cast of:" << std::endl << indent+1;
+	arg->print(os, indent+1);
+	os << std::endl << indent << "... to: ";
+	os << targetString();
+	Expression::print( os, indent );
+}
+
 VirtualCastExpr::VirtualCastExpr( Expression *arg_, Type *toType ) : Expression(), arg(arg_) {
 	set_result(toType);
Index: src/SynTree/Expression.h
===================================================================
--- src/SynTree/Expression.h	(revision c0bf94ec8b5f4f0f6a4ac9de014bc1d596f29233)
+++ src/SynTree/Expression.h	(revision b03eed6a17a1fe2f04d90bcdc9417eaddbcac5c7)
@@ -192,4 +192,5 @@
 	CastExpr( Expression * arg, bool isGenerated = true );
 	CastExpr( Expression * arg, Type * toType, bool isGenerated = true );
+	CastExpr( Expression * arg, void * ) = delete; // prevent accidentally passing pointers for isGenerated in the first constructor
 	CastExpr( const CastExpr & other );
 	virtual ~CastExpr();
@@ -199,4 +200,24 @@
 
 	virtual CastExpr * clone() const { return new CastExpr( * this ); }
+	virtual void accept( Visitor & v ) { v.visit( this ); }
+	virtual Expression * acceptMutator( Mutator & m ) { return m.mutate( this ); }
+	virtual void print( std::ostream & os, Indenter indent = {} ) const;
+};
+
+/// KeywordCastExpr represents a cast to 'keyword types', e.g. (thread &)t
+class KeywordCastExpr : public Expression {
+public:
+	Expression * arg;
+	enum Target {
+		Coroutine, Thread, Monitor, NUMBER_OF_TARGETS
+	} target;
+
+	KeywordCastExpr( Expression * arg, Target target );
+	KeywordCastExpr( const KeywordCastExpr & other );
+	virtual ~KeywordCastExpr();
+
+	const std::string & targetString() const;
+
+	virtual KeywordCastExpr * clone() const { return new KeywordCastExpr( * this ); }
 	virtual void accept( Visitor & v ) { v.visit( this ); }
 	virtual Expression * acceptMutator( Mutator & m ) { return m.mutate( this ); }
Index: src/SynTree/Mutator.h
===================================================================
--- src/SynTree/Mutator.h	(revision c0bf94ec8b5f4f0f6a4ac9de014bc1d596f29233)
+++ src/SynTree/Mutator.h	(revision b03eed6a17a1fe2f04d90bcdc9417eaddbcac5c7)
@@ -59,7 +59,8 @@
 	virtual Expression * mutate( UntypedExpr * untypedExpr ) = 0;
 	virtual Expression * mutate( NameExpr * nameExpr ) = 0;
-	virtual Expression * mutate( AddressExpr * castExpr ) = 0;
+	virtual Expression * mutate( AddressExpr * addrExpr ) = 0;
 	virtual Expression * mutate( LabelAddressExpr * labAddressExpr ) = 0;
 	virtual Expression * mutate( CastExpr * castExpr ) = 0;
+	virtual Expression * mutate( KeywordCastExpr * castExpr ) = 0;
 	virtual Expression * mutate( VirtualCastExpr * castExpr ) = 0;
 	virtual Expression * mutate( UntypedMemberExpr * memberExpr ) = 0;
Index: src/SynTree/SynTree.h
===================================================================
--- src/SynTree/SynTree.h	(revision c0bf94ec8b5f4f0f6a4ac9de014bc1d596f29233)
+++ src/SynTree/SynTree.h	(revision b03eed6a17a1fe2f04d90bcdc9417eaddbcac5c7)
@@ -69,4 +69,5 @@
 class LabelAddressExpr;
 class CastExpr;
+class KeywordCastExpr;
 class VirtualCastExpr;
 class MemberExpr;
Index: src/SynTree/Visitor.h
===================================================================
--- src/SynTree/Visitor.h	(revision c0bf94ec8b5f4f0f6a4ac9de014bc1d596f29233)
+++ src/SynTree/Visitor.h	(revision b03eed6a17a1fe2f04d90bcdc9417eaddbcac5c7)
@@ -62,4 +62,5 @@
 	virtual void visit( NameExpr * nameExpr ) = 0;
 	virtual void visit( CastExpr * castExpr ) = 0;
+	virtual void visit( KeywordCastExpr * castExpr ) = 0;
 	virtual void visit( VirtualCastExpr * castExpr ) = 0;
 	virtual void visit( AddressExpr * addressExpr ) = 0;