[llvm-bugs] [Bug 51301] New: Error defining function specialization outside class body

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51301

            Bug ID: 51301
           Summary: Error defining function specialization outside class
                    body
           Product: clang
           Version: 12.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: fchelnokov at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Clang refuses to accept valid code:
```
#include <concepts>

template<class T> 
struct A { static void foo(); };

template<std::integral T>
struct A<T> { static void foo(); };

template<class T>
void A<T>::foo() {}

template<std::integral T>
void A<T>::foo() {}

int main() { A<int>::foo(); }
```

Clang prints the error https://gcc.godbolt.org/z/hYfYGPfMh :
```
error: type constraint differs in template redeclaration
template<std::integral T>
```

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