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Change wording on array_into_iter lint for 1.53 and edition changes.

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This commit is contained in:
Mara Bos 2021-05-25 17:12:45 +02:00
parent 481971978f
commit 37e17803b5
1 changed files with 11 additions and 17 deletions
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28
compiler/rustc_lint/src/array_into_iter.rs
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@ -21,21 +21,15 @@ declare_lint! {
///
/// ### Explanation
///
/// In the future, it is planned to add an `IntoIter` implementation for
/// arrays such that it will iterate over *values* of the array instead of
/// references. Due to how method resolution works, this will change
/// existing code that uses `into_iter` on arrays. The solution to avoid
/// this warning is to use `iter()` instead of `into_iter()`.
///
/// This is a [future-incompatible] lint to transition this to a hard error
/// in the future. See [issue #66145] for more details and a more thorough
/// description of the lint.
///
/// [issue #66145]: https://github.com/rust-lang/rust/issues/66145
/// [future-incompatible]: ../index.md#future-incompatible-lints
/// Since Rust 1.53, arrays implement `IntoIterator`. However, to avoid
/// breakage, `array.into_iter()` in Rust 2015 and 2018 code will still
/// behave as `(&array).into_iter()`, returning an iterator over
/// references, just like in Rust 1.52 and earlier.
/// This only applies to the method call syntax `array.into_iter()`, not to
/// any other syntax such as `for _ in array` or `IntoIterator::into_iter(array)`.
pub ARRAY_INTO_ITER,
Warn,
"detects calling `into_iter` on arrays",
"detects calling `into_iter` on arrays in Rust 2015 and 2018",
@future_incompatible = FutureIncompatibleInfo {
reference: "issue #66145 <https://github.com/rust-lang/rust/issues/66145>",
reason: FutureIncompatibilityReason::EditionSemanticsChange(Edition::Edition2021),
@ -105,10 +99,10 @@ impl<'tcx> LateLintPass<'tcx> for ArrayIntoIter {
};
cx.struct_span_lint(ARRAY_INTO_ITER, *span, |lint| {
lint.build(&format!(
"this method call currently resolves to `<&{} as IntoIterator>::into_iter` (due \
to autoref coercions), but that might change in the future when \
`IntoIterator` impls for arrays are added.",
target,
"this method call resolves to `<&{} as IntoIterator>::into_iter` \
(due to backwards compatibility), \
but will resolve to <{} as IntoIterator>::into_iter in Rust 2021.",
target, target,
))
.span_suggestion(
call.ident.span,