28 lines
469 B
Rust
28 lines
469 B
Rust
|
// check-pass
|
||
|
|
|
||
|
|
pub trait ResultExt {
|
||
|
|
type Ok;
|
||
|
|
fn err_eprint_and_ignore(self) -> Option<Self::Ok>;
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<O, E> ResultExt for std::result::Result<O, E>
|
||
|
|
where
|
||
|
|
E: std::error::Error,
|
||
|
|
{
|
||
|
|
type Ok = O;
|
||
|
|
fn err_eprint_and_ignore(self) -> Option<O>
|
||
|
|
where
|
||
|
|
Self: ,
|
||
|
|
{
|
||
|
|
match self {
|
||
|
|
Err(e) => {
|
||
|
|
eprintln!("{}", e);
|
||
|
|
None
|
||
|
|
}
|
||
|
|
Ok(o) => Some(o),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {}
|