error[E0301]: cannot mutably borrow in a pattern guard | |
--> $DIR/E0301.rs:14:19 | |
| | |
LL | option if option.take().is_none() => {}, //~ ERROR E0301 | |
| ^^^^^^ borrowed mutably in pattern guard | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0301`. |