error[E0381]: assign to part of possibly-uninitialized variable: `x`
  --> $DIR/reassignment_immutable_fields_overlapping.rs:12:5
   |
LL |     x.a = 1;
   |     ^^^^^^^ use of possibly-uninitialized `x`

error[E0594]: cannot assign to `x.b`, as `x` is not declared as mutable
  --> $DIR/reassignment_immutable_fields_overlapping.rs:13:5
   |
LL |     let x: Foo;
   |         - help: consider changing this to be mutable: `mut x`
LL |     x.a = 1;
LL |     x.b = 22;
   |     ^^^^^^^^ cannot assign

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0381, E0594.
For more information about an error, try `rustc --explain E0381`.