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error[E0384]: cannot assign to immutable argument `_x`
--> $DIR/immutable-arg.rs:2:5
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LL | fn foo(_x: u32) {
| -- help: make this binding mutable: `mut _x`
LL | _x = 4;
| ^^^^^^ cannot assign to immutable argument
error: aborting due to previous error
For more information about this error, try `rustc --explain E0384`.
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