src/test/ui/mismatched_types/issue-36053-2.stderr

   1 error[E0631]: type mismatch in closure arguments
   2   --> $DIR/issue-36053-2.rs:7:32
   3    |
   4 LL |     once::<&str>("str").fuse().filter(|a: &str| true).count();
   5    |                                ^^^^^^ -------------- found signature of `for<'r> fn(&'r str) -> _`
   6    |                                |
   7    |                                expected signature of `for<'r> fn(&'r &str) -> _`
   8    |
   9 note: required by a bound in `filter`
  10   --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
  11    |
  12 LL |         P: FnMut(&Self::Item) -> bool,
  13    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `filter`
  14
  15 error[E0599]: the method `count` exists for struct `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:53]>`, but its trait bounds were not satisfied
  16   --> $DIR/issue-36053-2.rs:7:55
  17    |
  18 LL |     once::<&str>("str").fuse().filter(|a: &str| true).count();
  19    |                                       --------------  ^^^^^ method cannot be called on `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:53]>` due to unsatisfied trait bounds
  20    |                                       |
  21    |                                       doesn't satisfy `<_ as FnOnce<(&&str,)>>::Output = bool`
  22    |                                       doesn't satisfy `_: FnMut<(&&str,)>`
  23    |
  24   ::: $SRC_DIR/core/src/iter/adapters/filter.rs:LL:COL
  25    |
  26 LL | pub struct Filter<I, P> {
  27    | ----------------------- doesn't satisfy `_: Iterator`
  28    |
  29    = note: the following trait bounds were not satisfied:
  30            `<[closure@$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`
  36
  37 error: aborting due to 2 previous errors
  38
  39 Some errors have detailed explanations: E0599, E0631.
  40 For more information about an error, try `rustc --explain E0599`.