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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++/100288] [11/12 Regression] g++-11 internal error and fails
 to precompile a concept
Date: Sat, 01 May 2021 18:22:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100288

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-invalid-code
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D99599

--- Comment #3 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Agreed, the testcase looks invalid much like PR99599.  One workaround for
avoiding the constraint recursion here would be to change the signature of

  template <OstreamInsertable Type>
  inline void operator<<(CSVTabIns &&tab, Type const &value)

to something like

  template <std::same_as<std::remove_cvref_t<CSVTabIns>> U, OstreamInsertab=
le
Type>
  inline void operator<<(U &&tab, Type const &value)

so that the constraint OstreamInsertable<Type> is checked on this overload =
only
if the first argument to << has the expected type.=