Trait glib::value::private::FromValueOptionalSealed

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pub trait FromValueOptionalSealed<'a> { }

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impl<'a, T, C, E> FromValueOptionalSealed<'a> for T
where T: FromValue<'a, Checker = C>, C: ValueTypeChecker<Error = ValueTypeMismatchOrNoneError<E>>, E: Error + Send + Sized + 'static,