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Implied bounds for transparent attribute #149

Merged
merged 2 commits into from Sep 5, 2021
Merged

Implied bounds for transparent attribute #149

merged 2 commits into from Sep 5, 2021

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dtolnay
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@dtolnay dtolnay commented Sep 5, 2021

This is the remaining piece of #79.

The field of a transparent variant is required to implement Display and Error (not necessarily 'static), since we delegate those two traits to it.

#[derive(Error, Debug)]
enum MyError<E> {
    #[error(transparent)]
    Delegate(#[from] E),
}
// generated

impl<E> Error for MyError<E>
where
    E: Error,
    Self: Debug + Display;

impl<E> Display for MyError<E>
where
    E: Display;

impl<E> From<E> for MyError<E>;

@dtolnay dtolnay merged commit 0a1c5bd into master Sep 5, 2021
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@dtolnay dtolnay deleted the bound branch Sep 5, 2021
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