[Bug c++/109319] New: [13 Regression] ICE in build_min_non_dep_op_overload, at cp/tree.cc:3793

[gscfq--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109319

            Bug ID: 109319
           Summary: [13 Regression] ICE in build_min_non_dep_op_overload,
                    at cp/tree.cc:3793
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gs...@t-online.de
  Target Milestone: ---

Started between 20221106 and 20221120, with -std=c++23 :
(follow-up of pr108437)


$ cat z1.cc
struct S
{
  static int operator[] (int x) { int a[2]; return a[x]; }
};
template<class T> int f ()
{
  S s;
  ++s[0,1];
  return 0;
}


$ cat z2.cc
struct S
{
  static int operator[] (int x) { int a[2]; return a[x]; }
};
template<class T> int f ()
{
  S s;
  ++s[1,0];
  return 0;
}


$ g++-13-20230326 -c z1.cc -std=c++23
z1.cc: In function 'int f()':
z1.cc:8:6: warning: top-level comma expression in array subscript changed
meaning in C++23 [-Wcomma-subscript]
    8 |   ++s[0,1];
      |      ^
z1.cc:8:10: internal compiler error: in build_min_non_dep_op_overload, at
cp/tree.cc:3793
    8 |   ++s[0,1];
      |          ^
0x8de226 build_min_non_dep_op_overload(tree_node*, tree_node*, tree_node*,
vec<tree_node*, va_gc, vl_embed>*)
        ../../gcc/cp/tree.cc:3793
0x7ad99d grok_array_decl(unsigned int, tree_node*, tree_node*, vec<tree_node*,
va_gc, vl_embed>**, int)
        ../../gcc/cp/decl2.cc:569
0x843ca4 cp_parser_postfix_open_square_expression
        ../../gcc/cp/parser.cc:8223
0x856671 cp_parser_postfix_expression
        ../../gcc/cp/parser.cc:7814
0x86a60f cp_parser_unary_expression
        ../../gcc/cp/parser.cc:9141
0x83e79f cp_parser_cast_expression
        ../../gcc/cp/parser.cc:10045
0x86a707 cp_parser_unary_expression
        ../../gcc/cp/parser.cc:9055
0x83e79f cp_parser_cast_expression
        ../../gcc/cp/parser.cc:10045
0x83f07f cp_parser_binary_expression
        ../../gcc/cp/parser.cc:10147
0x83fa74 cp_parser_assignment_expression
        ../../gcc/cp/parser.cc:10490
0x8411b2 cp_parser_expression
        ../../gcc/cp/parser.cc:10660
0x844837 cp_parser_expression_statement
        ../../gcc/cp/parser.cc:12816
0x851cbc cp_parser_statement
        ../../gcc/cp/parser.cc:12596
0x852d54 cp_parser_statement_seq_opt
        ../../gcc/cp/parser.cc:12967
0x852e0f cp_parser_compound_statement
        ../../gcc/cp/parser.cc:12919
0x873958 cp_parser_function_body
        ../../gcc/cp/parser.cc:25335
0x873958 cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc/cp/parser.cc:25386
0x873e16 cp_parser_function_definition_after_declarator
        ../../gcc/cp/parser.cc:32012
0x874f90 cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc/cp/parser.cc:31929
0x874f90 cp_parser_init_declarator
        ../../gcc/cp/parser.cc:22789