[Bug c++/102963] New: [modules] ICE failed static_assert of concept

[johelegp at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102963

            Bug ID: 102963
           Summary: [modules] ICE failed static_assert of concept
           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/7h1MPqe1h.

mod.cpp:
```C++
export module mod;
export template<class T>
concept C = false;
```

test.cpp:
```C++
import mod;
static_assert(C<int>);
```

Output:
```
test.cpp:2:15: error: static assertion failed
    2 | static_assert(C<int>);
      |               ^~~~~~
test.cpp:2:15: note: constraints not satisfied
'
In module mod, imported at /app/test.cpp:1:
mod.cpp:3:9:   in import_entity_index, at cp/module.cc:3953
    3 | concept C = false;
      |             ^~~~~
0x20037b9 internal_error(char const*, ...)
        ???:0
0x7d6c17 fancy_abort(char const*, int, char const*)
        ???:0
0x966d5c get_importing_module(tree_node*, bool)
        ???:0
0x201fcb1 pp_format(pretty_printer*, text_info*)
        ???:0
0x2020330 pp_format_verbatim(pretty_printer*, text_info*)
        ???:0
0x2020411 pp_verbatim(pretty_printer*, char const*, ...)
        ???:0
0x9046d7 maybe_print_single_constraint_context(diagnostic_context*, tree_node*)
        ???:0
0x20023f1 diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info*)
        ???:0
0x2002d4d inform(unsigned int, char const*, ...)
        ???:0
0x86008f diagnose_constraints(unsigned int, tree_node*, tree_node*)
        ???:0
0xab8483 finish_static_assert(tree_node*, tree_node*, unsigned int, bool, bool)
        ???:0
0xa0bea5 c_parse_file()
        ???:0
0xb92e22 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.
```