src/test/ui/associated-types/impl-trait-return-missing-constraint.stderr

   1 error[E0271]: type mismatch resolving `<impl Bar as Foo>::Item == i32`
   2   --> $DIR/impl-trait-return-missing-constraint.rs:25:13
   3    |
   4 LL | fn bar() -> impl Bar {
   5    |             -------- the expected opaque type
   6 ...
   7 LL | fn baz() -> impl Bar<Item = i32> {
   8    |             ^^^^^^^^^^^^^^^^^^^^ expected associated type, found `i32`
   9 LL |
  10 LL |     bar()
  11    |     ----- return type was inferred to be `impl Bar` here
  12    |
  13    = note: expected associated type `<impl Bar as Foo>::Item`
  14                          found type `i32`
  15    = help: consider constraining the associated type `<impl Bar as Foo>::Item` to `i32` or calling a method that returns `<impl Bar as Foo>::Item`
  16    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
  17 help: consider constraining the associated type `<impl Bar as Foo>::Item` to `i32`
  18    |
  19 LL | fn bar() -> impl Bar<Item = i32> {
  20    |                     ++++++++++++
  21
  22 error: aborting due to previous error
  23
  24 For more information about this error, try `rustc --explain E0271`.