https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84489
--- Comment #11 from Jason Merrill <jason at gcc dot gnu.org> --- Author: jason Date: Fri Mar 23 22:03:51 2018 New Revision: 258824 URL: https://gcc.gnu.org/viewcvs?rev=258824&root=gcc&view=rev Log: PR c++/78489 - wrong SFINAE behavior. PR c++/84489 * pt.c (type_unification_real): Don't defer substitution failure. Added: trunk/gcc/testsuite/g++.dg/cpp0x/fntmpdefarg4a.C trunk/gcc/testsuite/g++.dg/cpp0x/sfinae60.C trunk/gcc/testsuite/g++.dg/cpp0x/sfinae61.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/pt.c