error[E0133]: access to union field is unsafe and requires unsafe function or block
  --> $DIR/union.rs:27:20
   |
LL |         Foo { bar: _a } => {},
   |                    ^^ access to union field
   |
   = note: the field may not be properly initialized: using uninitialized data will cause undefined behavior

error[E0133]: access to union field is unsafe and requires unsafe function or block
  --> $DIR/union.rs:31:20
   |
LL |               pizza: Pizza {
   |  ____________________^
LL | |                 topping: Some(PizzaTopping::Cheese) | Some(PizzaTopping::Pineapple) | None
LL | |             }
   | |_____________^ access to union field
   |
   = note: the field may not be properly initialized: using uninitialized data will cause undefined behavior

error[E0133]: access to union field is unsafe and requires unsafe function or block
  --> $DIR/union.rs:38:20
   |
LL |         Foo { zst: () } => {}
   |                    ^^ access to union field
   |
   = note: the field may not be properly initialized: using uninitialized data will cause undefined behavior

error[E0133]: access to union field is unsafe and requires unsafe function or block
  --> $DIR/union.rs:41:22
   |
LL |         Foo { pizza: Pizza { .. } } => {}
   |                      ^^^^^^^^^^^^ access to union field
   |
   = note: the field may not be properly initialized: using uninitialized data will cause undefined behavior

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0133`.