https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88395
--- Comment #7 from Nicholas Krause <xerofoify at gmail dot com> --- (In reply to Nicholas Krause from comment #6) > Created attachment 45242 [details] > Proposed Bug Fix This is my proposed fix after tracing it and reading it carefully seems that passing the NULL_TREE in rather than the correct decl tree of concepts is causing the bug. If this is correct I will just run the gcc test suite and post to the list.