Make invalid LHSs a parse-time (reference) error

src/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 315 matching lines @@
   V(set_string, "set")                                                   \
   V(map_field_string, "%map")                                            \
   V(elements_field_string, "%elements")                                  \
   V(length_field_string, "%length")                                      \
   V(cell_value_string, "%cell_value")                                    \
   V(function_class_string, "Function")                                   \
   V(illegal_argument_string, "illegal argument")                         \
   V(MakeReferenceError_string, "MakeReferenceError")                     \
   V(MakeSyntaxError_string, "MakeSyntaxError")                           \
   V(MakeTypeError_string, "MakeTypeError")                               \
-  V(invalid_lhs_in_assignment_string, "invalid_lhs_in_assignment")       \
-  V(invalid_lhs_in_for_in_string, "invalid_lhs_in_for_in")               \
-  V(invalid_lhs_in_postfix_op_string, "invalid_lhs_in_postfix_op")       \
-  V(invalid_lhs_in_prefix_op_string, "invalid_lhs_in_prefix_op")         \
   V(illegal_return_string, "illegal_return")                             \
   V(illegal_break_string, "illegal_break")                               \
   V(illegal_continue_string, "illegal_continue")                         \
   V(unknown_label_string, "unknown_label")                               \
   V(redeclaration_string, "redeclaration")                               \
   V(space_string, " ")                                                   \
   V(exec_string, "exec")                                                 \
   V(zero_string, "0")                                                    \
   V(global_eval_string, "GlobalEval")                                    \
   V(identity_hash_string, "v8::IdentityHash")                            \
@@ skipping 2774 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_