error[E0301]: cannot mutably borrow in a pattern guard
  --> $DIR/E0301.rs:4:19
   |
LL |         option if option.take().is_none() => {},
   |                   ^^^^^^ borrowed mutably in pattern guard
   |
   = help: add `#![feature(bind_by_move_pattern_guards)]` to the crate attributes to enable

error[E0596]: cannot borrow `option` as mutable, as it is immutable for the pattern guard
  --> $DIR/E0301.rs:4:19
   |
LL |         option if option.take().is_none() => {},
   |                   ^^^^^^ cannot borrow as mutable
   |
   = note: variables bound in patterns are immutable until the end of the pattern guard

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0301, E0596.
For more information about an error, try `rustc --explain E0301`.