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error[E0596]: cannot borrow `y.0` as mutable, as it is immutable for the pattern guard
  --> $DIR/guard-mutability-1.rs:8:33
   |
LL |         Some(mut y) if let Some(ref mut z) = y => {
   |                                 ^^^^^^^^^ cannot borrow as mutable
   |
   = note: variables bound in patterns are immutable until the end of the pattern guard

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0596`.