| error[E0404]: expected trait, found builtin type `isize` | |
| --> $DIR/test.rs:4:6 | |
| | | |
| LL | impl isize for usize { fn foo(&self) {} } | |
| | ^^^^^ not a trait | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0404`. |