error[E0277]: cannot add `()` to `{integer}`
  --> $DIR/issue-11771.rs:3:7
   |
LL |     1 +
   |       ^ no implementation for `{integer} + ()`
   |
   = help: the trait `std::ops::Add<()>` is not implemented for `{integer}`

error[E0277]: cannot add `()` to `{integer}`
  --> $DIR/issue-11771.rs:8:7
   |
LL |     1 +
   |       ^ no implementation for `{integer} + ()`
   |
   = help: the trait `std::ops::Add<()>` is not implemented for `{integer}`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.