| error[E0368]: binary assignment operation `+=` cannot be applied to type `&isize` | |
| --> $DIR/issue-5239-1.rs:4:30 | |
| | | |
| LL | let x = |ref x: isize| { x += 1; }; | |
| | -^^^^^ | |
| | | | |
| | cannot use `+=` on type `&isize` | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0368`. |