error[E0384]: cannot assign twice to immutable variable `a`
  --> $DIR/mut-ref-mut-2021.rs:9:5
   |
LL |     let Foo(a) = Foo(0);
   |             - first assignment to `a`
LL |     a = 42;
   |     ^^^^^^ cannot assign twice to immutable variable
   |
help: consider making this binding mutable
   |
LL |     let Foo(mut a) = Foo(0);
   |             +++
help: to modify the original value, take a borrow instead
   |
LL |     let Foo(ref mut a) = Foo(0);
   |             +++++++

error[E0384]: cannot assign twice to immutable variable `a`
  --> $DIR/mut-ref-mut-2021.rs:15:5
   |
LL |     let Foo(ref a) = Foo(0);
   |             ----- first assignment to `a`
LL |     a = &42;
   |     ^^^^^^^ cannot assign twice to immutable variable

error[E0384]: cannot assign twice to immutable variable `a`
  --> $DIR/mut-ref-mut-2021.rs:21:5
   |
LL |     let Foo(ref mut a) = Foo(0);
   |             --------- first assignment to `a`
LL |     a = &mut 42;
   |     ^^^^^^^^^^^ cannot assign twice to immutable variable

error[E0384]: cannot assign twice to immutable variable `a`
  --> $DIR/mut-ref-mut-2021.rs:27:5
   |
LL |     let Foo(a) = &Foo(0);
   |             - first assignment to `a`
LL |     a = &42;
   |     ^^^^^^^ cannot assign twice to immutable variable

error[E0384]: cannot assign twice to immutable variable `a`
  --> $DIR/mut-ref-mut-2021.rs:33:5
   |
LL |     let Foo(ref a) = &Foo(0);
   |             ----- first assignment to `a`
LL |     a = &42;
   |     ^^^^^^^ cannot assign twice to immutable variable

error[E0384]: cannot assign twice to immutable variable `a`
  --> $DIR/mut-ref-mut-2021.rs:39:5
   |
LL |     let Foo(a) = &mut Foo(0);
   |             - first assignment to `a`
LL |     a = &mut 42;
   |     ^^^^^^^^^^^ cannot assign twice to immutable variable

error[E0384]: cannot assign twice to immutable variable `a`
  --> $DIR/mut-ref-mut-2021.rs:45:5
   |
LL |     let Foo(ref a) = &mut Foo(0);
   |             ----- first assignment to `a`
LL |     a = &42;
   |     ^^^^^^^ cannot assign twice to immutable variable

error[E0384]: cannot assign twice to immutable variable `a`
  --> $DIR/mut-ref-mut-2021.rs:51:5
   |
LL |     let Foo(ref mut a) = &mut Foo(0);
   |             --------- first assignment to `a`
LL |     a = &mut 42;
   |     ^^^^^^^^^^^ cannot assign twice to immutable variable

error: aborting due to 8 previous errors

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