https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99806
--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:8f4f2fbc17c2a225c29ea20a2b6046cbdc7b3155 commit r10-9691-g8f4f2fbc17c2a225c29ea20a2b6046cbdc7b3155 Author: Marek Polacek <pola...@redhat.com> Date: Thu Apr 8 14:39:28 2021 -0400 c++: Fix two issues with auto function parameter [PR99806] When we have a member function with auto parameter like this: struct S { void f(auto); }; cp_parser_member_declaration -> grokfield produces a FUNCTION_DECL "void S::foo(auto:1)", and then finish_fully_implicit_template turns that FUNCTION_DECL into a TEMPLATE_DECL. The bug here is that we only call cp_parser_save_default_args for a FUNCTION_DECL. As a consequence, abbrev10.C is rejected because we complain that the default argument has not been defined, and abbrev11.C ICEs, because we don't re-parse the delayed noexcept, so the DEFERRED_PARSE tree leaks into tsubst* where we crash. This patch fixes both issues. gcc/cp/ChangeLog: PR c++/99806 * parser.c (cp_parser_member_declaration): Call cp_parser_save_default_args even for function templates. Use STRIP_TEMPLATE on the declaration we're passing. gcc/testsuite/ChangeLog: PR c++/99806 * g++.dg/concepts/abbrev10.C: New test. * g++.dg/concepts/abbrev11.C: New test. (cherry picked from commit 625dadaf5df5a2ae0d8c5660fd1eec8ba354479c)
