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Auto merge of #84147 - cuviper:array-method-dispatch, r=nikomatsakis,m-ou-se

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Cautiously add IntoIterator for arrays by value

Add the attribute described in #84133, `#[rustc_skip_array_during_method_dispatch]`, which effectively hides a trait from method dispatch when the receiver type is an array.

Then cherry-pick `IntoIterator for [T; N]` from #65819 and gate it with that attribute. Arrays can now be used as `IntoIterator` normally, but `array.into_iter()` has edition-dependent behavior, returning `slice::Iter` for 2015 and 2018 editions, or `array::IntoIter` for 2021 and later.

r? `@nikomatsakis`
cc `@LukasKalbertodt` `@rust-lang/libs`
This commit is contained in:
bors 2021-04-25 07:26:49 +00:00
commit 13a2615883
18 changed files with 237 additions and 171 deletions
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compiler/rustc_span/src/symbol.rs
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@ -1033,6 +1033,7 @@ symbols! {
rustc_regions,
rustc_reservation_impl,
rustc_serialize,
rustc_skip_array_during_method_dispatch,
rustc_specialization_trait,
rustc_stable,
rustc_std_internal_symbol,