44   struct Parameter : public ZoneObject {  struct
45     Parameter(Expression* pattern, Expression* initializer, int position,  in Parameter()  argument
52     PointerWithPayload<Expression, bool, 1> initializer_and_is_rest;
54     Expression* pattern;
55     Expression* initializer() const {  in initializer()
58     int position;
59     int initializer_end_position;
60     inline bool is_rest() const { return initializer_and_is_rest.GetPayload(); }  in is_rest()
62     Parameter* next_parameter = nullptr;
63     bool is_simple() const {  in is_simple()
68     const AstRawString* name() const {  in name()
73     Parameter** next() { return &next_parameter; }  in next()
74     Parameter* const* next() const { return &next_parameter; }  in next()