src/test/ui/issues/issue-47412.rs

   1 // revisions: mir thir
   2 // [thir]compile-flags: -Z thir-unsafeck
   3
   4 #[derive(Copy, Clone)]
   5 enum Void {}
   6
   7 // Tests that we detect unsafe places (specifically, union fields and
   8 // raw pointer dereferences), even when they're matched on while having
   9 // an uninhabited type (equivalent to `std::intrinsics::unreachable()`).
  10
  11 fn union_field() {
  12     union Union { unit: (), void: Void }
  13     let u = Union { unit: () };
  14     match u.void {}
  15     //~^ ERROR access to union field is unsafe
  16 }
  17
  18 fn raw_ptr_deref() {
  19     let ptr = std::ptr::null::<Void>();
  20     match *ptr {}
  21     //~^ ERROR dereference of raw pointer is unsafe
  22 }
  23
  24 fn main() {}