[Bug preprocessor/119391] New: Rejects valid

[neilb at protonmail dot ch via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119391

            Bug ID: 119391
           Summary: Rejects valid
           Product: gcc
           Version: 14.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
          Assignee: unassigned at gcc dot gnu.org
          Reporter: neilb at protonmail dot ch
  Target Milestone: ---

This is well-defined in at least C++23 but --std=c++23 --pedantic-errors gives
a hard error.

#if 1 << 63
#endif