jcsxky wrote:
> This still doesn't handle cases such as:
>
> ```c++
> template<typename T, typename U, typename V, typename W>
> concept E = sizeof(T) == sizeof(U) && sizeof(V) == sizeof(W);
>
> template<typename T> // T = char
> struct A
> {
> template<typename U> // U = signed char
> struct B
> {
> template<typename V, typename W, typename X> // V = int, W = int, X =
> short
> requires E<T, U, V, W> // incorrectly substitutes T = int, U = short,
> V = int, V = int
> static void f();
> };
> };
>
>
> template<typename T, typename U> // T = int, U = int
> struct C
> {
> template<typename V> // V = short
> struct D
> {
> friend void A<char>::B<signed char>::f<T, U, V>();
> };
> };
>
> template struct C<int, int>::D<short>;
>
> extern template void A<char>::B<signed char>::f<int, int, short>();
> ```
>
> (which is handled by
> [be79079](https://github.com/llvm/llvm-project/commit/be79079507ffbd9b29683498f405dc2c32dd8ba7))
Thanks for your patience and testcases! They really make me understand these
related issues more clearly.
https://github.com/llvm/llvm-project/pull/90646
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