https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98899
--- Comment #6 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:25fdd0d6df44044a8b505e6fcd07270e2e279b06 commit r11-7065-g25fdd0d6df44044a8b505e6fcd07270e2e279b06 Author: Marek Polacek <pola...@redhat.com> Date: Mon Feb 1 23:30:05 2021 -0500 c++: ICE with late parsing of noexcept in nested class [PR98899] Here we crash with a noexcept-specifier in a nested template class, because my handling of such deferred-parse noexcept-specifiers was gronked when we need to instantiate a DEFERRED_PARSE before it was actually parsed at the end of the outermost class. In struct S { template<class> struct B { B() noexcept(noexcept(x)); int x; }; struct A : B<int> { A() : B() {} }; }; we call complete_type for B<int> which triggers tsubsting S::B<int>::B() whose noexcept-specifier still contains a DEFERRED_PARSE. The trick is to stash such noexcept-specifiers into DEFPARSE_INSTANTIATIONS so that we can replace it later when we've finally parsed all deferred noexcept-specifiers. In passing, fix missing usage of UNPARSED_NOEXCEPT_SPEC_P. gcc/cp/ChangeLog: PR c++/98899 * parser.c (cp_parser_class_specifier_1): Use any possible DEFPARSE_INSTANTIATIONS to update DEFERRED_NOEXCEPT_PATTERN. (cp_parser_save_noexcept): Initialize DEFPARSE_INSTANTIATIONS. * pt.c (tsubst_exception_specification): Stash new_specs into DEFPARSE_INSTANTIATIONS. * tree.c (fixup_deferred_exception_variants): Use UNPARSED_NOEXCEPT_SPEC_P. gcc/testsuite/ChangeLog: PR c++/98899 * g++.dg/cpp0x/noexcept65.C: New test.
