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From: "johelegp at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/103341] New: ICE type of variable instantiation constrained
 on template parameter
Date: Sat, 20 Nov 2021 18:54:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103341

            Bug ID: 103341
           Summary: ICE type of variable instantiation constrained on
                    template parameter
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: johelegp at gmail dot com
                CC: johelegp at gmail dot com
  Target Milestone: ---

See https://godbolt.org/z/68GYeKqK4.

```C++
template<class, class> struct is_same { };
template<class T, class U> concept same_as =3D is_same<T, U>::value;
template<class T> inline constexpr same_as<T> auto trait_v{1};
using _ [[maybe_unused]] =3D decltype(trait_v<int>);
```

Output:
```
<source>: In instantiation of 'constexpr const auto [requires
::same_as<<placeholder>, T>] trait_v<int>':
<source>:4:37:   required from here
<source>:3:52: internal compiler error: tree check: accessed elt 1 of
'tree_vec' with 0 elts in hash, at cp/constraint.cc:2503
    3 | template<class T> inline constexpr same_as<T> auto trait_v{1};
      |                                                    ^~~~~~~
0x206d4e9 internal_error(char const*, ...)
        ???:0
0x6da40c tree_vec_elt_check_failed(int, int, char const*, int, char const*)
        ???:0
0x85fca0 sat_hasher::hash(sat_entry*)
        ???:0
0x85aed7 satisfaction_cache::satisfaction_cache(tree_node*, tree_node*,
sat_info)
        ???:0
0x85f01a constraints_satisfied_p(tree_node*, tree_node*)
        ???:0
0xa3384b do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
        ???:0
0x8d2c1d cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ???:0
0xa46987 instantiate_decl(tree_node*, bool, bool)
        ???:0
0x8e7c9e maybe_instantiate_decl(tree_node*)
        ???:0
0x8e9760 mark_used(tree_node*, int)
        ???:0
0xabe557 finish_id_expression(tree_node*, tree_node*, tree_node*, cp_id_kin=
d*,
bool, bool, bool*, bool, bool, bool, bool, char const**, unsigned int)
        ???:0
0xa0cc65 c_parse_file()
        ???:0
0xb94bf2 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.
Compiler returned: 1
```=