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error[E0301]: cannot mutably borrow in a pattern guard
--> $DIR/E0301.rs:4:19
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LL | option if option.take().is_none() => {}, //~ ERROR E0301
| ^^^^^^ borrowed mutably in pattern guard
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= help: add #![feature(bind_by_move_pattern_guards)] to the crate attributes to enable
error: aborting due to previous error
For more information about this error, try `rustc --explain E0301`.
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