https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87480
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> --- Author: jason Date: Wed Mar 20 20:31:40 2019 New Revision: 269826 URL: https://gcc.gnu.org/viewcvs?rev=269826&root=gcc&view=rev Log: PR c++/87480 - decltype of member access in default template arg The issue here is that declval<T>().d is considered instantiation-dependent within a template, as the access to 'd' might depend on the particular specialization. But when we're deducing template arguments for a call, we know that the call and the arguments are non-dependent, so we can do the substitution as though we aren't in a template. Which strictly speaking we aren't, since the default argument is considered a separate definition. * pt.c (type_unification_real): Accept a dependent result in template context. Added: trunk/gcc/testsuite/g++.dg/cpp0x/fntmpdefarg11.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/pt.c
