|  | error[E0133]: initializing type with `rustc_layout_scalar_valid_range` attr is unsafe and requires unsafe function or block | 
|  | --> $DIR/ranged_ints_const.rs:8:34 | 
|  | | | 
|  | LL | const fn foo() -> NonZero<u32> { NonZero(0) } | 
|  | |                                  ^^^^^^^^^^ initializing type with `rustc_layout_scalar_valid_range` attr | 
|  | | | 
|  | = note: initializing a layout restricted type's field with a value outside the valid range is undefined behavior | 
|  |  | 
|  | error: aborting due to 1 previous error | 
|  |  | 
|  | For more information about this error, try `rustc --explain E0133`. |