src/test/ui/lint/lint-ctypes-73251-2.rs

   1 // revisions: min_tait full_tait
   2 #![feature(min_type_alias_impl_trait)]
   3 #![cfg_attr(full_tait, feature(type_alias_impl_trait))]
   4 //[full_tait]~^ WARN incomplete
   5 #![deny(improper_ctypes)]
   6
   7 pub trait TraitA {
   8     type Assoc;
   9 }
  10
  11 impl TraitA for u32 {
  12     type Assoc = u32;
  13 }
  14
  15 pub trait TraitB {
  16     type Assoc;
  17 }
  18
  19 impl<T> TraitB for T where T: TraitA {
  20     type Assoc = <T as TraitA>::Assoc;
  21 }
  22
  23 type AliasA = impl TraitA<Assoc = u32>;
  24
  25 type AliasB = impl TraitB<Assoc = AliasA>;
  26
  27 fn use_of_a() -> AliasA { 3 }
  28
  29 fn use_of_b() -> AliasB { 3 }
  30
  31 extern "C" {
  32     pub fn lint_me() -> <AliasB as TraitB>::Assoc; //~ ERROR: uses type `impl TraitA`
  33 }
  34
  35 fn main() {}