src/test/ui/impl-trait/question_mark.rs

   1 // check-pass
   2
   3 use std::fmt::Debug;
   4
   5 #[derive(Debug)]
   6 pub struct Target;
   7
   8 #[derive(Debug)]
   9 pub struct Source;
  10 impl From<Source> for Target {
  11     fn from(_: Source) -> Self {
  12         Self
  13     }
  14 }
  15
  16 fn maybe_source() -> Result<(), Source> {
  17     todo!()
  18 }
  19
  20 pub fn typaram() -> Result<(), impl Debug> {
  21     maybe_source()?;
  22     Ok::<_, Target>(())
  23 }
  24
  25 pub fn direct() -> Result<(), impl Debug> {
  26     maybe_source()?;
  27     Err(Target)
  28 }
  29
  30 fn main() {}