error[E0308]: mismatched types --> $DIR/integral-variable-unification-error.rs:5:9 | LL | let mut x | ----- expected due to the type of this binding LL | = LL | 2; | - expected due to this value LL | x = 5.0; | ^^^ expected integer, found floating-point number error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.