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

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// check-pass
use std::fmt::Debug;
#[derive(Debug)]
pub struct Target;
#[derive(Debug)]
pub struct Source;
impl From<Source> for Target {
fn from(_: Source) -> Self {
Self
}
}
fn maybe_source() -> Result<(), Source> {
todo!()
}
pub fn typaram() -> Result<(), impl Debug> {
maybe_source()?;
Ok::<_, Target>(())
}
pub fn direct() -> Result<(), impl Debug> {
maybe_source()?;
Err(Target)
}
fn main() {}