[−][src]Struct core::option::NoneError
The error type that results from applying the try operator (?
) to a None
value. If you wish
to allow x?
(where x
is an Option<T>
) to be converted into your error type, you can
implement impl From<NoneError>
for YourErrorType
. In that case, x?
within a function that
returns Result<_, YourErrorType>
will translate a None
value into an Err
result.
Trait Implementations
impl Copy for NoneError
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impl PartialEq<NoneError> for NoneError
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impl Eq for NoneError
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impl Ord for NoneError
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impl PartialOrd<NoneError> for NoneError
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impl Clone for NoneError
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impl Hash for NoneError
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impl Debug for NoneError
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Auto Trait Implementations
Blanket Implementations
impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,