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6aa015ae9d
Allow `IndexSlice` to be indexed by ranges. This comes with some annoyances as the index type can no longer inferred from indexing expressions. The biggest offender for this is `IndexVec::from_fn_n(|idx| ..., n)` where the index type won't be inferred from the call site or any index expressions inside the closure. My main use case for this is mapping a `Place` to `Range<Idx>` for value tracking where the range represents all the values the place contains.