Struct tower::util::error::optional::None [−][src]
pub struct None(_);
This is supported on crate feature
util
only.Expand description
Error returned if the inner Service
has not been set.
Trait Implementations
impl Error for None
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impl Error for None
[src]fn source(&self) -> Option<&(dyn Error + 'static)>
1.30.0[src]
fn source(&self) -> Option<&(dyn Error + 'static)>
1.30.0[src]The lower-level source of this error, if any. Read more
fn backtrace(&self) -> Option<&Backtrace>
[src]
fn backtrace(&self) -> Option<&Backtrace>
[src]🔬 This is a nightly-only experimental API. (
backtrace
)Returns a stack backtrace, if available, of where this error occurred. Read more
fn description(&self) -> &str
1.0.0[src]
fn description(&self) -> &str
1.0.0[src]👎 Deprecated since 1.42.0:
use the Display impl or to_string()
Auto Trait Implementations
impl RefUnwindSafe for None
impl Send for None
impl Sync for None
impl Unpin for None
impl UnwindSafe for None
Blanket Implementations
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
[src]
pub fn borrow_mut(&mut self) -> &mut T
[src]Mutably borrows from an owned value. Read more
impl<T> Instrument for T
[src]
impl<T> Instrument for T
[src]fn instrument(self, span: Span) -> Instrumented<Self>
[src]
fn instrument(self, span: Span) -> Instrumented<Self>
[src]Instruments this type with the provided Span
, returning an
Instrumented
wrapper. Read more
fn in_current_span(self) -> Instrumented<Self>
[src]
fn in_current_span(self) -> Instrumented<Self>
[src]impl<V, T> VZip<V> for T where
V: MultiLane<T>,
impl<V, T> VZip<V> for T where
V: MultiLane<T>,