error: used binding `_foo` which is prefixed with an underscore. A leading underscore signals that a binding will not be used. --> $DIR/used_underscore_binding.rs:17:5 | 17 | _foo + 1 | ^^^^ | = note: `-D used-underscore-binding` implied by `-D warnings` error: used binding `_foo` which is prefixed with an underscore. A leading underscore signals that a binding will not be used. --> $DIR/used_underscore_binding.rs:22:20 | 22 | println!("{}", _foo); | ^^^^ error: used binding `_foo` which is prefixed with an underscore. A leading underscore signals that a binding will not be used. --> $DIR/used_underscore_binding.rs:23:16 | 23 | assert_eq!(_foo, _foo); | ^^^^ error: used binding `_foo` which is prefixed with an underscore. A leading underscore signals that a binding will not be used. --> $DIR/used_underscore_binding.rs:23:22 | 23 | assert_eq!(_foo, _foo); | ^^^^ error: used binding `_underscore_field` which is prefixed with an underscore. A leading underscore signals that a binding will not be used. --> $DIR/used_underscore_binding.rs:36:5 | 36 | s._underscore_field += 1; | ^^^^^^^^^^^^^^^^^^^ error: aborting due to 5 previous errors