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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99599] [11 Regression] Concepts requirement falsely
 reporting cyclic dependency, breaks tag_invoke pattern
Date: Mon, 15 Mar 2021 14:20:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99599

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |11.0
                 CC|                            |jason at gcc dot gnu.org

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Rejected since r11-2774

    c++: Check satisfaction before non-dep convs. [CWG2369]

    It's very hard to use concepts to protect a template from hard errors d=
ue
to
    unwanted instantiation if constraints aren't checked until after doing =
all
    substitution and checking of non-dependent conversions.

    It was pretty straightforward to insert the satisfaction check into the
    logic, but I needed to make the 3-parameter version of
    satisfy_declaration_constraints call push_tinst_level like the 2-parame=
ter
    version already does.  For simplicity, I also made it add any needed ou=
ter
    template arguments from the TEMPLATE_DECL to the args.

    The testsuite changes are mostly because this change causes unsatisfact=
ion
    to cause deduction to fail rather than reject the candidate later in
    overload resolution.=