rust/tests/ui/command-line-diagnostics.st...

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error[E0384]: cannot assign twice to immutable variable `x`
--> $DIR/command-line-diagnostics.rs:6:5
|
LL | let x = 42;
| - first assignment to `x`
LL | x = 43;
| ^^^^^^ cannot assign twice to immutable variable
|
help: consider making this binding mutable
|
LL | let mut x = 42;
| +++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0384`.