error[E0308]: mismatched types
  --> $DIR/deref-suggestion.rs:18:9
   |
18 |     foo(s);
   |         ^ expected struct `std::string::String`, found reference
   |
   = note: expected type `std::string::String`
              found type `&std::string::String`
   = help: here are some functions which might fulfill your needs:
           - .escape_debug()
           - .escape_default()
           - .escape_unicode()
           - .to_lowercase()
           - .to_uppercase()

error[E0308]: mismatched types
  --> $DIR/deref-suggestion.rs:23:10
   |
23 |     foo3(u);
   |          ^ expected u32, found &u32
   |
   = note: expected type `u32`
              found type `&u32`
   = help: try with `*u`

error[E0308]: mismatched types
  --> $DIR/deref-suggestion.rs:30:9
   |
30 |     foo(&"aaa".to_owned());
   |         ^^^^^^^^^^^^^^^^^ expected struct `std::string::String`, found reference
   |
   = note: expected type `std::string::String`
              found type `&std::string::String`
   = help: try with `"aaa".to_owned()`

error[E0308]: mismatched types
  --> $DIR/deref-suggestion.rs:31:9
   |
31 |     foo(&mut "aaa".to_owned());
   |         ^^^^^^^^^^^^^^^^^^^^^ expected struct `std::string::String`, found mutable reference
   |
   = note: expected type `std::string::String`
              found type `&mut std::string::String`
   = help: try with `"aaa".to_owned()`

error[E0308]: mismatched types
  --> $DIR/deref-suggestion.rs:12:20
   |
12 |     ($x:expr) => { &$x }
   |                    ^^^ expected u32, found &{integer}
...
32 |     foo3(borrow!(0));
   |          ---------- in this macro invocation
   |
   = note: expected type `u32`
              found type `&{integer}`

error: aborting due to 5 previous errors