virtual void visit(VariableReference &);
virtual void visit(MemberAccess &);
virtual void visit(Swizzle &);
virtual void visit(UnaryExpression &);
virtual void visit(BinaryExpression &);
virtual void visit(Assignment &);
virtual void visit(VariableReference &);
virtual void visit(MemberAccess &);
virtual void visit(Swizzle &);
virtual void visit(UnaryExpression &);
virtual void visit(BinaryExpression &);
virtual void visit(Assignment &);