[Bug c++/120151] ICE in GCC when compiling a templated decltype with incomplete lambda body with -std=c++20

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120151

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 61360
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61360&action=edit
Reduced testcase