File: immutable-arg.stderr

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error[E0384]: cannot assign to immutable argument `_x`
  --> $DIR/immutable-arg.rs:2:5
   |
LL |     _x = 4;
   |     ^^^^^^ cannot assign to immutable argument
   |
help: consider making this binding mutable
   |
LL | fn foo(mut _x: u32) {
   |        +++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0384`.