[Bug c++/68395] [concepts] segfault in valid code

[ryan.burn at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68395

--- Comment #1 from ryan.burn at gmail dot com ---
Created attachment 36745
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36745&action=edit
preprocessed code