src/test/ui/generic-associated-types/issue-76535.rs

   1 #![feature(generic_associated_types)]
   2
   3 pub trait SubTrait {}
   4
   5 pub trait SuperTrait {
   6     type SubType<'a>: SubTrait;
   7
   8     fn get_sub<'a>(&'a mut self) -> Self::SubType<'a>;
   9 }
  10
  11 pub struct SubStruct<'a> {
  12     sup: &'a mut SuperStruct,
  13 }
  14
  15 impl<'a> SubTrait for SubStruct<'a> {}
  16
  17 pub struct SuperStruct {
  18     value: u8,
  19 }
  20
  21 impl SuperStruct {
  22     pub fn new(value: u8) -> SuperStruct {
  23         SuperStruct { value }
  24     }
  25 }
  26
  27 impl SuperTrait for SuperStruct {
  28     type SubType<'a> = SubStruct<'a>;
  29
  30     fn get_sub<'a>(&'a mut self) -> Self::SubType<'a> {
  31         SubStruct { sup: self }
  32     }
  33 }
  34
  35 fn main() {
  36     let sub: Box<dyn SuperTrait<SubType = SubStruct>> = Box::new(SuperStruct::new(0));
  37       //~^ ERROR missing generics for associated type
  38       //~^^ ERROR the trait
  39       //~| ERROR the trait
  40 }