DKLoehr wrote:
I ended up with the following reproducer:
```
template <typename T> struct S {
template <typename T2>
using Arg = T::template Arg<T2>;
void f(Arg<void>);
void f(Arg<int>);
};
```
Running this with `clang++ repro.cc -fsyntax-only -std=c++20` yields
```
repro.cc:5:8: error: class member cannot be redeclared
5 | void f(Arg<int>);
| ^
repro.cc:4:8: note: previous declaration is here
4 | void f(Arg<void>);
| ^
```
The same error occurs regardless of which types are inside the < >.
https://github.com/llvm/llvm-project/pull/133610
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