2bca5c4fc1
Introduce `structurally_normalize_const`, use it in `rustc_hir_typeck`
Introduces `structurally_normalize_const` to typecking to separate the "eval a const" step from the "try to turn a valtree into a target usize" in HIR typeck, where we may still have infer vars and stuff around.
I also changed `check_expr_repeat` to move a double evaluation of a const into a single one. I'll leave inline comments.
r? ```@BoxyUwU```
I hesitated to really test this on the new solver where it probably matters for unevaluated consts. If you're worried about the side-effects, I'd be happy to craft some more tests 😄
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