Struct std::option::NoneError [−][src]
pub struct 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 PartialOrd<NoneError> for NoneError
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impl PartialOrd<NoneError> for NoneError
[src]pub fn partial_cmp(&self, other: &NoneError) -> Option<Ordering>
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#[must_use]pub fn lt(&self, other: &Rhs) -> bool
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#[must_use]
pub fn lt(&self, other: &Rhs) -> bool#[must_use]pub fn le(&self, other: &Rhs) -> bool
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#[must_use]
pub fn le(&self, other: &Rhs) -> bool#[must_use]pub fn gt(&self, other: &Rhs) -> bool
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#[must_use]
pub fn gt(&self, other: &Rhs) -> bool#[must_use]pub fn ge(&self, other: &Rhs) -> bool
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#[must_use]
pub fn ge(&self, other: &Rhs) -> boolimpl Copy for NoneError
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impl Eq for NoneError
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impl StructuralEq for NoneError
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impl StructuralPartialEq for NoneError
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Auto Trait Implementations
impl RefUnwindSafe for NoneError
impl Send for NoneError
impl Sync for NoneError
impl Unpin for NoneError
impl UnwindSafe for NoneError
Blanket Implementations
impl<T> Borrow<T> for T where
T: ?Sized,
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impl<T> Borrow<T> for T where
T: ?Sized,
[src]pub fn borrow(&self) -> &TⓘNotable traits for &'_ mut I
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W
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Notable traits for &'_ mut I
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W
impl<T> BorrowMut<T> for T where
T: ?Sized,
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impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]pub fn borrow_mut(&mut self) -> &mut TⓘNotable traits for &'_ mut I
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W
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Notable traits for &'_ mut I
impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W