#[target_feature(enable = "avx2")] can be applied to non-functions, but doesn't do anything

[nicokoch]

Playground link demonstrating the problem

Playground link when it works

The compiler should tell me that the annotation will not do anything (in the first case)

[thomwiggers]

Your example doesn't work anymore, because the playground doesn't require target_feature(enable="avx2") to compile/run AVX2 code anymore. Similarly, avx512 intrinsics also just work...

[jethrogb]

Issue remains.

cc @gnzlbg