error[E0308]: mismatched types
  --> $DIR/as-ref.rs:6:27
   |
LL |   opt.map(|arg| takes_ref(arg));
   |       ---                 ^^^ expected &Foo, found struct `Foo`
   |       |
   |       help: consider using `as_ref` instead: `as_ref().map`
   |
   = note: expected type `&Foo`
              found type `Foo`

error[E0308]: mismatched types
  --> $DIR/as-ref.rs:8:37
   |
LL |   opt.and_then(|arg| Some(takes_ref(arg)));
   |       --------                      ^^^ expected &Foo, found struct `Foo`
   |       |
   |       help: consider using `as_ref` instead: `as_ref().and_then`
   |
   = note: expected type `&Foo`
              found type `Foo`

error[E0308]: mismatched types
  --> $DIR/as-ref.rs:11:27
   |
LL |   opt.map(|arg| takes_ref(arg));
   |       ---                 ^^^ expected &Foo, found struct `Foo`
   |       |
   |       help: consider using `as_ref` instead: `as_ref().map`
   |
   = note: expected type `&Foo`
              found type `Foo`

error[E0308]: mismatched types
  --> $DIR/as-ref.rs:13:35
   |
LL |   opt.and_then(|arg| Ok(takes_ref(arg)));
   |       --------                    ^^^ expected &Foo, found struct `Foo`
   |       |
   |       help: consider using `as_ref` instead: `as_ref().and_then`
   |
   = note: expected type `&Foo`
              found type `Foo`

error[E0308]: mismatched types
  --> $DIR/as-ref.rs:16:27
   |
LL |   let y: Option<&usize> = x;
   |                           ^
   |                           |
   |                           expected enum `std::option::Option`, found reference
   |                           help: you can convert from `&Option<T>` to `Option<&T>` using `.as_ref()`: `x.as_ref()`
   |
   = note: expected type `std::option::Option<&usize>`
              found type `&std::option::Option<usize>`

error[E0308]: mismatched types
  --> $DIR/as-ref.rs:19:35
   |
LL |   let y: Result<&usize, &usize> = x;
   |                                   ^ expected enum `std::result::Result`, found reference
   |
   = note: expected type `std::result::Result<&usize, &usize>`
              found type `&std::result::Result<usize, usize>`
help: you can convert from `&Result<T, E>` to `Result<&T, &E>` using `.as_ref()`
   |
LL |   let y: Result<&usize, &usize> = x.as_ref();
   |                                   ^^^^^^^^^^

error[E0308]: mismatched types
  --> $DIR/as-ref.rs:23:34
   |
LL |   let y: Result<&usize, usize> = x;
   |                                  ^ expected enum `std::result::Result`, found reference
   |
   = note: expected type `std::result::Result<&usize, usize>`
              found type `&std::result::Result<usize, usize>`

error: aborting due to 7 previous errors

For more information about this error, try `rustc --explain E0308`.