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From: "gcc-bugs at marehr dot dialup.fu-berlin.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95371] New: [10 Regression] ICE concepts with template
 template parameter
Date: Wed, 27 May 2020 18:42:26 +0000
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X-Bugzilla-Component: c++
X-Bugzilla-Version: 10.1.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95371

            Bug ID: 95371
           Summary: [10 Regression] ICE concepts with template template
                    parameter
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gcc-bugs at marehr dot dialup.fu-berlin.de
  Target Milestone: ---

Hallo gcc-team,

the following code worked with gcc9, but ICEs with gcc 10.1 and in trunk

```c++
template <typename...>
struct configuration  {
    template <template <typename...> typename query_t>
    static constexpr bool exists() { return true; }

    template <template <typename...> typename query_t>
    void remove() requires(exists<query_t>());
};

int main() {
    configuration<> cfg{};
    cfg.remove<configuration>();
}
```

https://godbolt.org/z/NGU5i9


```
> g++-10 -std=3Dc++2a
<source>: In function 'int main()':
<source>:12:31: internal compiler error: Segmentation fault
   12 |     cfg.remove<configuration>();
      |                               ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1
```=