erichkeane added a comment.
In D145892#4191220 <https://reviews.llvm.org/D145892#4191220>, @HerrCai0907
wrote:
> I cannot find an example that throw `error: expression contains unexpanded
> parameter pack 'T'` in fold expression because code like ` (foo<T>(10 +
> (static_cast<U>(1))) + ...);` can be unpack both `T` and `U` in same `...`
> operator
>
> But this code can be diagnosed correctly
>
> template <typename... U> struct A {
> template <typename... T> void foo(T &&...Params) {
> (foo<T>(1 + (static_cast<U>(1))) + ...); // ok
>
> // error: expression contains unexpanded parameter pack 'T'
> foo<T>((... + static_cast<U>(1)));
>
> (foo<T>((... + static_cast<U>(1))) + ...); // ok
> }
> };
>
> Should I add this case into test?
I spent some time on this and I can't come up with any counter examples either.
Please add this to the test, add a release note, then this LGTM.
Repository:
rG LLVM Github Monorepo
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https://reviews.llvm.org/D145892/new/
https://reviews.llvm.org/D145892
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