add find_mut method to the Map trait #5528
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bors
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Mar 26, 2013
This currently requires workarounds for the borrow checker not being flow-sensitive for `LinearMap` and `TrieMap`, but it can already be expressed for `TreeMap` and `SmallIntMap` without that.
tesuji
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Jun 9, 2020
Cleanup: Use rustc's `same_type` for our `same_tys` This delegates our `same_tys` to [ty::TyS::same_type][same_type] to remove some duplication. Our `same_tys` was introduced 4 years ago in rust-lang#730. Before, it was building an inference context to be able to call `can_eq` to compare the types. The `rustc-dev-guide` has some more details about `can_eq` in [Type Inference -> Trying equality][try_eq]. Now, using the rustc function, we are essentially comparing the `DefId`s of the given types, which also makes more sense, IMO. I also confirmed that the FIXME is resolved via a bit of `dbg!`, however no UI tests seem to have been affected. [same_type]: https://github.com/rust-lang/rust/blob/659951c4a0d7450e43f61c61c0e87d0ceae17087/src/librustc_middle/ty/util.rs#L777 [try_eq]: https://rustc-dev-guide.rust-lang.org/type-inference.html#trying-equality --- changelog: none
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This currently requires workarounds for the borrow checker not being flow-sensitive for
LinearMapandTrieMap, but it can already be expressed forTreeMapandSmallIntMapwithout that.