--- Comment #11 from CVS Commits <cvs-commit at gcc dot> ---
The master branch has been updated by Paolo Carlini <>:

commit r10-5990-g83fe2b921830c177e3dee514aa07cbc7c8ceef1c
Author: Paolo Carlini <>
Date:   Wed Jan 15 22:28:46 2020 +0100

    Fix "PR c++/91073 if constexpr no longer works directly with Concepts."

    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.

        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.

        PR c++/91073
        * g++.dg/concepts/pr91073-1.C: New.
        * g++.dg/concepts/pr91073-2.C: Likewise.

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