[Bug c/87857] case label does not reduce to an integer constant

[sch...@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87857

--- Comment #2 from Andreas Schwab <sch...@linux-m68k.org> ---
1<<31 is undefined in C, but not in C++ (since C++14).