Rollup merge of rust-lang#129500 - fee1-dead-contrib:fxrel, r=compiler-errors

remove invalid `TyCompat` relation for effects

if the current impl uses `Maybe` (`impl const`), the parent impl must use `Maybe` (`impl const`) as well.

I'd like to rename `TyCompat` to `Sub` which is probably clearer. But it would conflict with my other PR.

r? ``@rust-lang/project-const-traits``

Author: matthiaskrgr

core/src/marker.rs

@@ -1097,7 +1097,6 @@ pub mod effects {
     pub trait TyCompat<T: ?Sized> {}
 
     impl<T: ?Sized> TyCompat<T> for T {}
-    impl<T: ?Sized> TyCompat<T> for Maybe {}
     impl<T: ?Sized> TyCompat<Maybe> for T {}
 
     #[lang = "EffectsIntersection"]