[Bug c++/106976] New: internal compiler error: tree check: expected class 'type', have 'exceptional' (error_mark) in override_type_for_decl_p, at dwarf2out.cc:24345

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106976

            Bug ID: 106976
           Summary: internal compiler error: tree check: expected class
                    'type', have 'exceptional' (error_mark) in
                    override_type_for_decl_p, at dwarf2out.cc:24345
           Product: gcc
           Version: 12.2.1
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

For this invalid code:


struct S{
  constexpr static auto s = requires { []; };
};


Without -g we get an unhelpful error:

$ g++-11 -std=c++20 -g -c ice.C
ice.C:2:25: error: storage size of 'S::s' isn't known
    2 |   constexpr static auto s = requires { []; };
      |                         ^


But it ICEs with -g

ice.C:1:8: internal compiler error: tree check: expected class 'type', have
'exceptional' (error_mark) in override_type_for_decl_p, at dwarf2out.cc:24345
    1 | struct S{
      |        ^
0x88a36b tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
        /home/jwakely/src/gcc/gcc/gcc/tree.cc:8877
0x79a909 tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
        /home/jwakely/src/gcc/gcc/gcc/tree.h:3643
0x79a909 override_type_for_decl_p
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:24345
0x79a909 gen_variable_die
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:24608
0xd92df8 gen_decl_die
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:27085
0xd9544c gen_member_die
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:25844
0xd9544c gen_struct_or_union_type_die
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:25930
0xd9544c gen_tagged_type_die
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:26131
0xd96660 gen_tagged_type_die
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:26085
0xd96660 gen_type_die_with_usage
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:26326
0xd931bb gen_type_die
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:26381
0xd931bb gen_decl_die
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:27020
0xd9436b dwarf2out_decl
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:27575
0xd94668 dwarf2out_type_decl
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:27293
0xd94668 dwarf2out_type_decl
        /home/jwakely/src/gcc/gcc/gcc/dwarf2out.cc:27288
0x10bc934 rest_of_type_compilation(tree_node*, int)
        /home/jwakely/src/gcc/gcc/gcc/passes.cc:339
0x997d17 finish_struct_1(tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/class.cc:7638
0x998cef finish_struct(tree_node*, tree_node*)
        /home/jwakely/src/gcc/gcc/gcc/cp/class.cc:7785
0xaeb608 cp_parser_class_specifier
        /home/jwakely/src/gcc/gcc/gcc/cp/parser.cc:26120
0xaeda95 cp_parser_type_specifier
        /home/jwakely/src/gcc/gcc/gcc/cp/parser.cc:19488
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