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This is a rather serious regression, filed in July 2019. Luckily the fix is simple: is localized to parser.c and cp-tree.h in cp and boils down to only a few lines. Testing OK on x86_64-linux. Approved off-line by Jason Merrill. /cp PR c++/91073 * cp-tree.h (is_constrained_auto): New. * parser.c (cp_parser_maybe_commit_to_declaration): Correctly handle concept-check expressions; take a cp_decl_specifier_seq* instead of a bool. (cp_parser_condition): Update call. (cp_parser_simple_declaration): Likewise. (cp_parser_placeholder_type_specifier): Correctly handle concept-check expressions. /testsuite PR c++/91073 * g++.dg/concepts/pr91073-1.C: New. * g++.dg/concepts/pr91073-2.C: Likewise.
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