tests/ui/issues/issue-58344.rs

   1 // check-pass
   2
   3 use std::ops::Add;
   4
   5 trait Trait<T> {
   6     fn get(self) -> T;
   7 }
   8
   9 struct Holder<T>(T);
  10
  11 impl<T> Trait<T> for Holder<T> {
  12     fn get(self) -> T {
  13         self.0
  14     }
  15 }
  16
  17 enum Either<L, R> {
  18     Left(L),
  19     Right(R),
  20 }
  21
  22 impl<L, R> Either<L, R> {
  23     fn converge<T>(self) -> T
  24     where
  25         L: Trait<T>,
  26         R: Trait<T>,
  27     {
  28         match self {
  29             Either::Left(val) => val.get(),
  30             Either::Right(val) => val.get(),
  31         }
  32     }
  33 }
  34
  35 fn add_generic<A: Add<B>, B>(
  36     lhs: A,
  37     rhs: B,
  38 ) -> Either<impl Trait<<A as Add<B>>::Output>, impl Trait<<A as Add<B>>::Output>> {
  39     if true { Either::Left(Holder(lhs + rhs)) } else { Either::Right(Holder(lhs + rhs)) }
  40 }
  41
  42 fn add_one(
  43     value: u32,
  44 ) -> Either<impl Trait<<u32 as Add<u32>>::Output>, impl Trait<<u32 as Add<u32>>::Output>> {
  45     add_generic(value, 1u32)
  46 }
  47
  48 pub fn main() {
  49     add_one(3).converge();
  50 }