void set_source(unsigned, unsigned);
virtual void visit(Block &);
void set_source(unsigned, unsigned);
virtual void visit(Block &);
virtual void visit(VariableReference &);
virtual void visit(InterfaceBlockReference &);
virtual void visit(MemberAccess &);
virtual void visit(VariableReference &);
virtual void visit(InterfaceBlockReference &);
virtual void visit(MemberAccess &);