sdkrystian wrote:
```cpp
template<typename T, typename U>
concept D = sizeof(T) == sizeof(U);
template<typename T>
struct A
{
template<typename U, typename V> requires D<U, V>
static void f();
};
template<typename T, typename U>
struct B
{
template<typename V>
struct C
{
friend void A<char>::f<T, U>();
};
};
template struct B<int, int>::C<short>;
extern template void A<char>::f<int, int>(); // crash here
```
https://github.com/llvm/llvm-project/pull/90646
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