Parameter packs not expanded in lambda template list

[llvmbot]

Bugzilla Link	49593
Version	trunk
OS	All
Reporter	LLVM Bugzilla Contributor
CC	@zygoloid

Extended Description

The following code intends to work, even if it fails in three major compilers:

template <typename... Ts>
void f(Ts...) {
([](){}, ...);
}

int main() { f(0, 0.5); }

(goldbot: https://godbolt.org/z/xnM9dY)

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: None (llvmbot)

| | | | --- | --- | | Bugzilla Link | [49593](https://llvm.org/bz49593) | | Version | trunk | | OS | All | | Reporter | LLVM Bugzilla Contributor | | CC | @zygoloid |

Extended Description

The following code intends to work, even if it fails in three major compilers:

template <typename... Ts>
void f(Ts...) {
([]<Ts>(){}, ...);
}

int main() { f(0, 0.5); }

(goldbot: https://godbolt.org/z/xnM9dY)