error[E0277]: the trait bound `u32: std::ops::Add<()>` is not satisfied
  --> $DIR/multiline-span-simple.rs:23:18
   |
23 |     foo(1 as u32 +
   |                  ^ no implementation for `u32 + ()`
   |
   = help: the trait `std::ops::Add<()>` is not implemented for `u32`

error: aborting due to previous error