https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91754
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:e3b60da8e07030b1417067295f047b25015f21f2 commit r10-6330-ge3b60da8e07030b1417067295f047b25015f21f2 Author: Marek Polacek <pola...@redhat.com> Date: Wed Jan 29 12:02:14 2020 -0500 c++: Fix template arguments comparison with class NTTP [PR91754] Here we fail to compile the attached test, stating that the use of T<s> in T<s>::T() {} is "invalid use of incomplete type". It is a function definition so grokdeclarator checks that the qualifying type is complete. When we parsed the class T, finish_struct gave the class a non-null TYPE_SIZE, making it COMPLETE_TYPE_P. But then we're parsing T<s>, a TEMPLATE_ID, in T<s>::T() {} so try to lookup_template_class T. This failed because we couldn't find such a class: comp_template_args told us that the argument lists don't match, because one of the args was wrapped in a VIEW_CONVERT_EXPR to make it look const. It seems to me that we should see through these artificial wrappers and consider the args same. 2020-01-29 Marek Polacek <pola...@redhat.com> PR c++/91754 - Fix template arguments comparison with class NTTP. * pt.c (class_nttp_const_wrapper_p): New. (template_args_equal): See through class_nttp_const_wrapper_p arguments. * g++.dg/cpp2a/nontype-class30.C: New test.
