[Bug c++/83644] ICE using type alias from recursive decltype in noexcept or return type

[gccbugbjorn at fahller dot se]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83644

--- Comment #1 from Björn Fahller <gccbugbjorn at fahller dot se> ---
Created attachment 42997
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42997&action=edit
Preprocessed source