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 defined here
   6    |                                |
   7    |                                expected due to this
   8    |
   9    = note: expected closure signature `for<'r> fn(&'r &str) -> _`
  10               found closure signature `for<'r> fn(&'r str) -> _`
  11 note: required by a bound in `filter`
  12   --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
  13    |
  14 LL |         P: FnMut(&Self::Item) -> bool,
  15    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `filter`
  16
  17 error[E0599]: the method `count` exists for struct `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:48]>`, but its trait bounds were not satisfied
  18   --> $DIR/issue-36053-2.rs:7:55
  19    |
  20 LL |     once::<&str>("str").fuse().filter(|a: &str| true).count();
  21    |                                       ---------       ^^^^^ method cannot be called on `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:48]>` due to unsatisfied trait bounds
  22    |                                       |
  23    |                                       doesn't satisfy `<_ as FnOnce<(&&str,)>>::Output = bool`
  24    |                                       doesn't satisfy `_: FnMut<(&&str,)>`
  25    |
  26   ::: $SRC_DIR/core/src/iter/adapters/filter.rs:LL:COL
  27    |
  28 LL | pub struct Filter<I, P> {
  29    | ----------------------- doesn't satisfy `_: Iterator`
  30    |
  31    = note: the following trait bounds were not satisfied:
  32            `<[closure@$DIR/issue-36053-2.rs:7:39: 7:48] as FnOnce<(&&str,)>>::Output = bool`
  33            which is required by `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:48]>: Iterator`
  34            `[closure@$DIR/issue-36053-2.rs:7:39: 7:48]: FnMut<(&&str,)>`
  35            which is required by `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:48]>: Iterator`
  36            `Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:48]>: Iterator`
  37            which is required by `&mut Filter<Fuse<std::iter::Once<&str>>, [closure@$DIR/issue-36053-2.rs:7:39: 7:48]>: Iterator`
  38
  39 error: aborting due to 2 previous errors
  40
  41 Some errors have detailed explanations: E0599, E0631.
  42 For more information about an error, try `rustc --explain E0599`.