error[E0308]: mismatched types
  --> $DIR/as-ref.rs:16:27
   |
LL |   opt.map(|arg| takes_ref(arg));
   |       -                   ^^^ expected &Foo, found struct `Foo`
   |       |
   |       help: consider using `as_ref` instead: `as_ref().`
   |
   = note: expected type `&Foo`
              found type `Foo`

error[E0308]: mismatched types
  --> $DIR/as-ref.rs:18:37
   |
LL |   opt.and_then(|arg| Some(takes_ref(arg)));
   |       -                             ^^^ expected &Foo, found struct `Foo`
   |       |
   |       help: consider using `as_ref` instead: `as_ref().`
   |
   = note: expected type `&Foo`
              found type `Foo`

error[E0308]: mismatched types
  --> $DIR/as-ref.rs:21:27
   |
LL |   opt.map(|arg| takes_ref(arg));
   |       -                   ^^^ expected &Foo, found struct `Foo`
   |       |
   |       help: consider using `as_ref` instead: `as_ref().`
   |
   = note: expected type `&Foo`
              found type `Foo`

error[E0308]: mismatched types
  --> $DIR/as-ref.rs:23:35
   |
LL |   opt.and_then(|arg| Ok(takes_ref(arg)));
   |       -                           ^^^ expected &Foo, found struct `Foo`
   |       |
   |       help: consider using `as_ref` instead: `as_ref().`
   |
   = note: expected type `&Foo`
              found type `Foo`

error: aborting due to 4 previous errors

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