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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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5
compiler/rustc_feature/src/builtin_attrs.rs
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@ -544,6 +544,11 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
rustc_main, Normal, template!(Word),
"the `#[rustc_main]` attribute is used internally to specify test entry point function",
),
rustc_attr!(
rustc_skip_array_during_method_dispatch, Normal, template!(Word),
"the `#[rustc_skip_array_during_method_dispatch]` attribute is used to exclude a trait \
from method dispatch when the receiver is an array, for compatibility in editions < 2021."
),
// ==========================================================================
// Internal attributes, Testing: