src/test/ui/consts/const-eval/const_let.rs

   1 fn main() {}
   2
   3 struct FakeNeedsDrop;
   4
   5 impl Drop for FakeNeedsDrop {
   6     fn drop(&mut self) {}
   7 }
   8
   9 // ok
  10 const X: FakeNeedsDrop = { let x = FakeNeedsDrop; x };
  11
  12 // ok (used to incorrectly error, see #62273)
  13 const X2: FakeNeedsDrop = { let x; x = FakeNeedsDrop; x };
  14
  15 // error
  16 const Y: FakeNeedsDrop = { let mut x = FakeNeedsDrop; x = FakeNeedsDrop; x };
  17 //~^ ERROR destructors cannot be evaluated at compile-time
  18
  19 // error
  20 const Y2: FakeNeedsDrop = { let mut x; x = FakeNeedsDrop; x = FakeNeedsDrop; x };
  21 //~^ ERROR destructors cannot be evaluated at compile-time
  22
  23 // error
  24 const Z: () = { let mut x = None; x = Some(FakeNeedsDrop); };
  25 //~^ ERROR destructors cannot be evaluated at compile-time
  26
  27 // error
  28 const Z2: () = { let mut x; x = None; x = Some(FakeNeedsDrop); };
  29 //~^ ERROR destructors cannot be evaluated at compile-time