[llvm-bugs] [Bug 51938] New: [ICE] consteval crash with fmtlib

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https://bugs.llvm.org/show_bug.cgi?id=51938

            Bug ID: 51938
           Summary: [ICE] consteval crash with fmtlib
           Product: clang
           Version: 12.0
          Hardware: Macintosh
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tim at klingt.org
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

compiling fmtlib/spdlog with appleclang from xcode-12.5 and xcode-13 in c++20
mode gives me an ICE.


trying to reduce the test case with cvise i ended up with this reproducer:
```
struct basic_format_string {        template < typename S >   consteval
basic_format_string(S
} using format_string = basic_format_string;
         format(format_string ;
         using filename_t = int;
         template < typename > struct rotating_file_sink  {          
filename_t calc_filename(}
        template < typename Mutex > filename_t rotating_file_sink< Mutex
>::calc_filename() {
  filename_t ext;
  format(ext)}
         template class rotating_file_sink< int >;
```

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