47    virtual void visit(class ir_rvalue *) { assert(!"unhandled error_type"); }  in visit()  function
48    virtual void visit(class ir_variable *) = 0;
49    virtual void visit(class ir_function_signature *) = 0;
50    virtual void visit(class ir_function *) = 0;
51    virtual void visit(class ir_expression *) = 0;
52    virtual void visit(class ir_texture *) = 0;
53    virtual void visit(class ir_swizzle *) = 0;
54    virtual void visit(class ir_dereference_variable *) = 0;
55    virtual void visit(class ir_dereference_array *) = 0;
56    virtual void visit(class ir_dereference_record *) = 0;
57    virtual void visit(class ir_assignment *) = 0;
58    virtual void visit(class ir_constant *) = 0;
59    virtual void visit(class ir_call *) = 0;
60    virtual void visit(class ir_return *) = 0;
61    virtual void visit(class ir_discard *) = 0;
62    virtual void visit(class ir_if *) = 0;
63    virtual void visit(class ir_loop *) = 0;
64    virtual void visit(class ir_loop_jump *) = 0;
73    virtual void visit(class ir_variable *) {}  in visit()  function
74    virtual void visit(class ir_expression *) {}  in visit()  function
75    virtual void visit(class ir_texture *) {}  in visit()  function
76    virtual void visit(class ir_swizzle *) {}  in visit()  function
77    virtual void visit(class ir_dereference_variable *) {}  in visit()  function
78    virtual void visit(class ir_dereference_array *) {}  in visit()  function
79    virtual void visit(class ir_dereference_record *) {}  in visit()  function
80    virtual void visit(class ir_assignment *) {}  in visit()  function
81    virtual void visit(class ir_constant *) {}  in visit()  function
82    virtual void visit(class ir_call *) {}  in visit()  function