sdkrystian wrote:
@erichkeane the most recent commit results in the following:
```cpp
template<typename T> void f(T);
void g() { }
template<typename T>
struct A {
// error: cannot declare an explicit specialization in a friend
template<> friend void f<>(T) { }
// error: friend function specialization cannot be defined
friend void f<>(T) { }
// error: cannot declare an explicit specialization in a friend
template<> friend void ::g() { }
// error: friend function definition cannot be qualified with '::'
friend void ::g() { }
};
void h() {
void i();
struct B {
// error: templates can only be declared in namespace or class scope
// error: cannot declare an explicit specialization in a friend
template<> friend void i() { }
// error: friend function cannot be defined in a local class
friend void i() { }
};
}
```
Unrelated, but it also seems that `template<> friend void f<>(T) { }` causes
[this
assert](https://github.com/llvm/llvm-project/blob/main/clang/lib/Sema/SemaDecl.cpp#L10477)
to fire. This happens because we clear `HasExplicitTemplateArgs` for invalid
declarations
[here](https://github.com/llvm/llvm-project/blob/main/clang/lib/Sema/SemaDecl.cpp#L10427).
I could include a fix, but it might fall outside the scope of this PR.
I also added a release note as requested.
https://github.com/llvm/llvm-project/pull/72863
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