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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99465] New: Segmentation fault when put lambda into
 requires clause
Date: Mon, 08 Mar 2021 13:24:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99465

            Bug ID: 99465
           Summary: Segmentation fault when put lambda into requires
                    clause
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

The following code will trigger the segmentation fault of gcc-trunk:

template <auto =3D 0>
auto g() requires ([] { return 0; } ());

int main() { g(); }

godbolt: https://godbolt.org/z/4bsaPd



error message:
<source>: In substitution of 'template<auto <anonymous> > auto g() requires
(<lambda>)() [with auto <anonymous> =3D 0]':
<source>:4:16:   required from here
<source>:2:6:   required by the constraints of 'template<auto <anonymous> >
auto g() requires (<lambda>)()'
Segmentation fault
    2 | auto g() requires ([] { return 0; } ());
      |                   ~~~~~~~~~~~~~~~~~~^~~
0x1cee989 internal_error(char const*, ...)
        ???:0
0x7748f3 pp_cxx_parameter_mapping(cxx_pretty_printer*, tree_node*)
        ???:0
0x7de235 expr_to_string(tree_node*)
        ???:0
0x1d0a861 pp_format(pretty_printer*, text_info*)
        ???:0
0x1ced50a diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info=
*)
        ???:0
0x1cee60d error_at(unsigned int, char const*, ...)
        ???:0
0x73c8ea constraints_satisfied_p(tree_node*, tree_node*)
        ???:0
0x9510c3 fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node*
const*, unsigned int, tree_node*, unification_kind_t, int, conversion**, bo=
ol,
bool)
        ???:0
0x6db9c2 build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ???:0
0x97d1ec finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, b=
ool,
bool, int)
        ???:0
0x8dd92d c_parse_file()
        ???:0
0xa5bd12 c_common_parse_file()
        ???:0
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.=