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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99599] [11/12 Regression] Concepts requirement falsely
 reporting cyclic dependency, breaks tag_invoke pattern
Date: Sat, 01 May 2021 17:38:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99599

--- Comment #6 from Patrick Palka <ppalka at gcc dot gnu.org> ---
FWIW, one workaround for this kind of constraint looping is to encode the
non-dependent conversion as a constraint.  For this particular testcase, th=
is
would mean changing the signature of

  template<fooable T> auto invoke_tag(bar_tag, T it);

to

  template<std::convertible_to<bar_tag> T, fooable U> auto invoke_tag(T, U =
it);=