[beta] backports #37266
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[beta] backports #37266
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In another attempt to fix rust-lang#36793 this commit attempts to head off any future problems by adding a custom `WidentUsizeHasher` which will widen any hashing of `isize` and `usize` to a `u64` as necessary. This obviates the need for a previous number of `as u64` annotations and will hopefully protect us against future problems here. Closes rust-lang#36793 (hopefully)
cc [`?` tracking issue](rust-lang#31436)
Note that attributes on expressions are still unstable and are behind the `stmt_expr_attributes` flag. cc [Tracking issue](rust-lang#15701)
[tracking issue](rust-lang#27749)
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extern crates (with a warning) #37023r? @alexcrichton