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Auto merge of #47832 - fintelia:vec-index, r=kennytm

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Have Vec use slice's implementations of Index<I> and IndexMut<I>

This PR simplifies the implementation of Index and IndexMut on Vec, and in the process enables indexing Vec by any user types that implement SliceIndex.

The stability annotations probably need to be changed, but I wasn't sure of the right way to do that. It also wasn't completely clear to me if this change could break any existing code.
This commit is contained in:
bors 2018-03-04 12:30:27 +00:00
commit 1e1bfc715f
3 changed files with 19 additions and 134 deletions
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7
src/test/ui/index-help.stderr
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@ -1,10 +1,11 @@
error[E0277]: the trait bound `std::vec::Vec<{integer}>: std::ops::Index<i32>` is not satisfied
error[E0277]: the trait bound `i32: std::slice::SliceIndex<[{integer}]>` is not satisfied
--> $DIR/index-help.rs:13:5
|
LL | x[0i32]; //~ ERROR E0277
| ^^^^^^^ vector indices are of type `usize` or ranges of `usize`
| ^^^^^^^ slice indices are of type `usize` or ranges of `usize`
|
= help: the trait `std::ops::Index<i32>` is not implemented for `std::vec::Vec<{integer}>`
= help: the trait `std::slice::SliceIndex<[{integer}]>` is not implemented for `i32`
= note: required because of the requirements on the impl of `std::ops::Index<i32>` for `std::vec::Vec<{integer}>`
error: aborting due to previous error