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use std::io;
struct MyError(()); // doesn't implement Debug
#[derive(Debug)]
struct MyErrorWithParam<T> {
x: T,
}
fn main() {
let res: Result<i32, ()> = Ok(0);
let _ = res.unwrap();
res.ok().expect("disaster!");
// the following should not warn, since `expect` isn't implemented unless
// the error type implements `Debug`
let res2: Result<i32, MyError> = Ok(0);
res2.ok().expect("oh noes!");
let res3: Result<u32, MyErrorWithParam<u8>> = Ok(0);
res3.ok().expect("whoof");
let res4: Result<u32, io::Error> = Ok(0);
res4.ok().expect("argh");
let res5: io::Result<u32> = Ok(0);
res5.ok().expect("oops");
let res6: Result<u32, &str> = Ok(0);
res6.ok().expect("meh");
}
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