error[E0308]: mismatched types
  --> $DIR/attribute-spans-preserved.rs:7:23
   |
LL | #[ foo ( let y: u32 = "z"; ) ]
   |                       ^^^ expected u32, found reference
   |
   = note: expected type `u32`
              found type `&'static str`

error[E0308]: mismatched types
  --> $DIR/attribute-spans-preserved.rs:8:23
   |
LL | #[ bar { let x: u32 = "y"; } ]
   |                       ^^^ expected u32, found reference
   |
   = note: expected type `u32`
              found type `&'static str`

error: aborting due to 2 previous errors

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