error[E0384]: cannot assign twice to immutable variable `a`
  --> $DIR/tainted-promoteds.rs:7:5
   |
LL |     let a = 0;
   |         -
   |         |
   |         first assignment to `a`
   |         help: consider making this binding mutable: `mut a`
LL |     a = &0 * &1 * &2 * &3;
   |     ^^^^^^^^^^^^^^^^^^^^^ cannot assign twice to immutable variable

error: aborting due to previous error

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