error[E0277]: cannot add `()` to `{integer}` --> $DIR/issue-11771.rs:3:7 | LL | 1 + | ^ no implementation for `{integer} + ()` | = help: the trait `Add<()>` is not implemented for `{integer}` = help: the following other types implement trait `Add`: > > > > and 48 others error[E0277]: cannot add `()` to `{integer}` --> $DIR/issue-11771.rs:8:7 | LL | 1 + | ^ no implementation for `{integer} + ()` | = help: the trait `Add<()>` is not implemented for `{integer}` = help: the following other types implement trait `Add`: > > > > and 48 others error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0277`.