https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87559
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Yeah. I think it is r261121 aka PR85761 that fixed the ICE. Wonder if it would be useful to add the #c1 testcase into testsuite or if lambda-const8.C is close enough that it covers it.