error[E0133]: borrow of layout constrained field with interior mutability is unsafe and requires unsafe function or block
  --> $DIR/ranged_ints3_const.rs:12:13
   |
LL |     let y = &x.0;
   |             ^^^^ borrow of layout constrained field with interior mutability
   |
   = note: references to fields of layout constrained fields lose the constraints. Coupled with interior mutability, the field can be changed to invalid values

error: aborting due to 1 previous error

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