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From: "mateusz.pusz at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/97103] New: ICE on nested requires expression template
 template instantiation
Date: Fri, 18 Sep 2020 09:45:12 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 11.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97103

            Bug ID: 97103
           Summary: ICE on nested requires expression template template
                    instantiation
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mateusz.pusz at gmail dot com
  Target Milestone: ---

```
template<typename R, typename Rep =3D double>
class quantity {};

template<template<typename, typename> typename Q>
inline constexpr bool valid_template_arguments =3D requires {
  requires requires { typename Q<int, int>; };
};
static_assert(valid_template_arguments<quantity>);
```

Might be related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D66564.=