1 error[E0631]: type mismatch in closure arguments
2 --> $DIR/issue-36053-2.rs:7:32
4 LL | once::<&str>("str").fuse().filter(|a: &str| true).count();
5 | ^^^^^^ -------------- found signature of `for<'r> fn(&'r str) -> _`
7 | expected signature of `for<'r> fn(&'r &str) -> _`
9 note: required by a bound in `filter`
10 --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
12 LL | P: FnMut(&Self::Item) -> bool,
13 | ^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `filter`
15 error[E0599]: the method `count` exists for struct `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:53]>`, but its trait bounds were not satisfied
16 --> $DIR/issue-36053-2.rs:7:55
18 LL | once::<&str>("str").fuse().filter(|a: &str| true).count();
19 | -------------- ^^^^^ method cannot be called on `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:53]>` due to unsatisfied trait bounds
21 | doesn't satisfy `<_ as FnOnce<(&&str,)>>::Output = bool`
22 | doesn't satisfy `_: FnMut<(&&str,)>`
24 ::: $SRC_DIR/core/src/iter/adapters/filter.rs:LL:COL
26 LL | pub struct Filter<I, P> {
27 | ----------------------- doesn't satisfy `_: Iterator`
29 = note: the following trait bounds were not satisfied:
30 `<[closure@$DIR/issue-36053-2.rs:7:39: 7:53] as FnOnce<(&&str,)>>::Output = bool`
31 which is required by `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:53]>: Iterator`
32 `[closure@$DIR/issue-36053-2.rs:7:39: 7:53]: FnMut<(&&str,)>`
33 which is required by `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:53]>: Iterator`
34 `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:53]>: Iterator`
35 which is required by `&mut Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:53]>: Iterator`
37 error: aborting due to 2 previous errors
39 Some errors have detailed explanations: E0599, E0631.
40 For more information about an error, try `rustc --explain E0599`.