src/test/ui/feature-gate/issue-43106-gating-of-derive.rs

   1 // `#![derive]` raises errors when it occurs at contexts other than ADT
   2 // definitions.
   3
   4 #[derive(Debug)]
   5 //~^ ERROR `derive` may only be applied to structs, enums and unions
   6 mod derive {
   7     mod inner { #![derive(Debug)] }
   8     //~^ ERROR `derive` may only be applied to structs, enums and unions
   9
  10     #[derive(Debug)]
  11     //~^ ERROR `derive` may only be applied to structs, enums and unions
  12     fn derive() { }
  13
  14     #[derive(Copy, Clone)] // (can't derive Debug for unions)
  15     union U { f: i32 }
  16
  17     #[derive(Debug)]
  18     struct S;
  19
  20     #[derive(Debug)]
  21     enum E { }
  22
  23     #[derive(Debug)]
  24     //~^ ERROR `derive` may only be applied to structs, enums and unions
  25     type T = S;
  26
  27     #[derive(Debug)]
  28     //~^ ERROR `derive` may only be applied to structs, enums and unions
  29     impl S { }
  30 }
  31
  32 fn main() {}