Inconsistent compile times with multidimensional arrays

[infalmo]

UPD: See comment

Compiling (rust nightly, release mode) this takes 4x as much time as this. The only difference between the two snippets is the size of the array (20 vs 100), which is surprising, since one would expect the compilation of the bigger array to take more time.

[Rageking8]

@rustbot label +I-compiletime

[Noratrieb]

This has nothing to do with OnceLock, I was able to reproduce this (I think, I was only able to test this on the playground which is fairly unreliable, but the results seem significant to me) even without it in a more minimal example.

I tried removing the generic_arg_infer feature as well but the playground was even more unreliable after that so I can't really say whether the feature isn't needed until I can test it on my computer.

[Mark-Simulacrum]

Seems to be equally fast either way with my local rustc.