parser.c
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The rule change in the title matches GCC's current behavior, so no change was needed. But the paper also makes 'typename' optional in a requirement-parameter-list, so this implements that. gcc/cp/ChangeLog 2020-02-28 Jason Merrill <jason@redhat.com> Implement P2092R0, Disambiguating Nested-Requirements * parser.c (cp_parser_requirement_parameter_list): Pass CP_PARSER_FLAGS_TYPENAME_OPTIONAL.