rust/tests/ui/methods/issues/issue-94581.rs

//@ run-rustfix
fn get_slice() -> &'static [i32] {
    &[1, 2, 3, 4]
}

fn main() {
    let _sqsum: i32 = get_slice().map(|i| i * i).sum(); //~ ERROR [E0599]
}
Be more lax in `.into_iter()` suggestion when encountering `Iterator` methods on non-`Iterator` ``` error[E0599]: no method named `map` found for struct `Vec<bool>` in the current scope --> $DIR/vec-on-unimplemented.rs:3:23 \| LL \| vec![true, false].map(\|v\| !v).collect::<Vec<_>>(); \| ^^^ `Vec<bool>` is not an iterator \| help: call `.into_iter()` first \| LL \| vec![true, false].into_iter().map(\|v\| !v).collect::<Vec<_>>(); \| ++++++++++++ ``` We used to provide some help through `rustc_on_unimplemented` on non-`impl Trait` and non-type-params, but this lets us get rid of some otherwise unnecessary conditions in the annotation on `Iterator`. 2024-03-01 21:37:56 +00:00			`//@ run-rustfix`
diagnostics: use rustc_on_unimplemented to recommend `[].iter()` To make this work, the `#[rustc_on_unimplemented]` data needs to be used to report method resolution errors, which is most of what this commit does. Fixes #94581 2022-03-08 11:04:20 -07:00			`fn get_slice() -> &'static [i32] {`
			`&[1, 2, 3, 4]`
			`}`

			`fn main() {`
Be more lax in `.into_iter()` suggestion when encountering `Iterator` methods on non-`Iterator` ``` error[E0599]: no method named `map` found for struct `Vec<bool>` in the current scope --> $DIR/vec-on-unimplemented.rs:3:23 \| LL \| vec![true, false].map(\|v\| !v).collect::<Vec<_>>(); \| ^^^ `Vec<bool>` is not an iterator \| help: call `.into_iter()` first \| LL \| vec![true, false].into_iter().map(\|v\| !v).collect::<Vec<_>>(); \| ++++++++++++ ``` We used to provide some help through `rustc_on_unimplemented` on non-`impl Trait` and non-type-params, but this lets us get rid of some otherwise unnecessary conditions in the annotation on `Iterator`. 2024-03-01 21:37:56 +00:00			`let _sqsum: i32 = get_slice().map(\|i\| i * i).sum(); //~ ERROR [E0599]`
diagnostics: use rustc_on_unimplemented to recommend `[].iter()` To make this work, the `#[rustc_on_unimplemented]` data needs to be used to report method resolution errors, which is most of what this commit does. Fixes #94581 2022-03-08 11:04:20 -07:00			`}`