error[E0308]: mismatched types
  --> $DIR/issue-1448-2.rs:6:24
   |
LL |     println!("{}", foo(10i32));
   |                        ^^^^^ expected u32, found i32
help: change the type of the numeric literal from `i32` to `u32`
   |
LL |     println!("{}", foo(10u32));
   |                        ^^^^^

error: aborting due to previous error

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