1.0.0[−][src]Trait af_lib::prelude::af_core::test::prelude::Error
Error
is a trait representing the basic expectations for error values,
i.e., values of type E
in Result<T, E>
. Errors must describe
themselves through the Display
and Debug
traits, and may provide
cause chain information:
Error::source()
is generally used when errors cross
"abstraction boundaries". If one module must report an error that is caused
by an error from a lower-level module, it can allow accessing that error
via Error::source()
. This makes it possible for the high-level
module to provide its own errors while also revealing some of the
implementation for debugging via source
chains.
Provided methods
pub fn source(&self) -> Option<&(dyn Error + 'static)>
1.30.0[src]
The lower-level source of this error, if any.
Examples
use std::error::Error; use std::fmt; #[derive(Debug)] struct SuperError { side: SuperErrorSideKick, } impl fmt::Display for SuperError { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "SuperError is here!") } } impl Error for SuperError { fn source(&self) -> Option<&(dyn Error + 'static)> { Some(&self.side) } } #[derive(Debug)] struct SuperErrorSideKick; impl fmt::Display for SuperErrorSideKick { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "SuperErrorSideKick is here!") } } impl Error for SuperErrorSideKick {} fn get_super_error() -> Result<(), SuperError> { Err(SuperError { side: SuperErrorSideKick }) } fn main() { match get_super_error() { Err(e) => { println!("Error: {}", e); println!("Caused by: {}", e.source().unwrap()); } _ => println!("No error"), } }
pub fn backtrace(&self) -> Option<&Backtrace>
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backtrace
)Returns a stack backtrace, if available, of where this error occurred.
This function allows inspecting the location, in code, of where an error
happened. The returned Backtrace
contains information about the stack
trace of the OS thread of execution of where the error originated from.
Note that not all errors contain a Backtrace
. Also note that a
Backtrace
may actually be empty. For more information consult the
Backtrace
type itself.
pub fn description(&self) -> &str
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use the Display impl or to_string()
if let Err(e) = "xc".parse::<u32>() { // Print `e` itself, no need for description(). eprintln!("Error: {}", e); }
pub fn cause(&self) -> Option<&dyn Error>
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replaced by Error::source, which can support downcasting
Implementations
impl dyn Error + 'static
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pub fn is<T>(&self) -> bool where
T: 'static + Error,
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T: 'static + Error,
Returns true
if the boxed type is the same as T
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: 'static + Error,
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T: 'static + Error,
Returns some reference to the boxed value if it is of type T
, or
None
if it isn't.
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
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T: 'static + Error,
Returns some mutable reference to the boxed value if it is of type T
, or
None
if it isn't.
impl dyn Error + 'static + Send
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pub fn is<T>(&self) -> bool where
T: 'static + Error,
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T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
impl dyn Error + 'static + Send + Sync
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pub fn is<T>(&self) -> bool where
T: 'static + Error,
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T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
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T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
impl dyn Error + 'static
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pub fn downcast<T>(
self: Box<dyn Error + 'static, Global>
) -> Result<Box<T, Global>, Box<dyn Error + 'static, Global>> where
T: 'static + Error,
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self: Box<dyn Error + 'static, Global>
) -> Result<Box<T, Global>, Box<dyn Error + 'static, Global>> where
T: 'static + Error,
Attempts to downcast the box to a concrete type.
pub fn chain(&self) -> Chain<'_>ⓘ
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error_iter
)Returns an iterator starting with the current error and continuing with
recursively calling Error::source
.
If you want to omit the current error and only use its sources,
use skip(1)
.
Examples
#![feature(error_iter)] use std::error::Error; use std::fmt; #[derive(Debug)] struct A; #[derive(Debug)] struct B(Option<Box<dyn Error + 'static>>); impl fmt::Display for A { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "A") } } impl fmt::Display for B { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "B") } } impl Error for A {} impl Error for B { fn source(&self) -> Option<&(dyn Error + 'static)> { self.0.as_ref().map(|e| e.as_ref()) } } let b = B(Some(Box::new(A))); // let err : Box<Error> = b.into(); // or let err = &b as &(dyn Error); let mut iter = err.chain(); assert_eq!("B".to_string(), iter.next().unwrap().to_string()); assert_eq!("A".to_string(), iter.next().unwrap().to_string()); assert!(iter.next().is_none()); assert!(iter.next().is_none());
impl dyn Error + 'static + Send
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pub fn downcast<T>(
self: Box<dyn Error + 'static + Send, Global>
) -> Result<Box<T, Global>, Box<dyn Error + 'static + Send, Global>> where
T: 'static + Error,
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self: Box<dyn Error + 'static + Send, Global>
) -> Result<Box<T, Global>, Box<dyn Error + 'static + Send, Global>> where
T: 'static + Error,
Attempts to downcast the box to a concrete type.
impl dyn Error + 'static + Send + Sync
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pub fn downcast<T>(
self: Box<dyn Error + 'static + Send + Sync, Global>
) -> Result<Box<T, Global>, Box<dyn Error + 'static + Send + Sync, Global>> where
T: 'static + Error,
1.3.0[src]
self: Box<dyn Error + 'static + Send + Sync, Global>
) -> Result<Box<T, Global>, Box<dyn Error + 'static + Send + Sync, Global>> where
T: 'static + Error,
Attempts to downcast the box to a concrete type.
Trait Implementations
Implementations on Foreign Types
impl Error for !
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impl Error for FromUtf16Error
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pub fn description(&self) -> &str
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impl Error for JoinPathsError
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pub fn description(&self) -> &str
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impl Error for FromUtf8Error
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pub fn description(&self) -> &str
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impl Error for FromBytesWithNulError
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pub fn description(&self) -> &str
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impl Error for TryFromIntError
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pub fn description(&self) -> &str
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impl Error for AddrParseError
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pub fn description(&self) -> &str
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impl Error for Error
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pub fn description(&self) -> &str
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pub fn cause(&self) -> Option<&dyn Error>
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pub fn source(&self) -> Option<&(dyn Error + 'static)>
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impl Error for NulError
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pub fn description(&self) -> &str
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impl Error for TryReserveError
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impl Error for AllocError
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impl<T> Error for TryLockError<T>
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impl Error for ParseIntError
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pub fn description(&self) -> &str
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impl Error for ParseFloatError
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pub fn description(&self) -> &str
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impl Error for StripPrefixError
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pub fn description(&self) -> &str
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impl<T> Error for Box<T, Global> where
T: Error,
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T: Error,
pub fn description(&self) -> &str
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pub fn cause(&self) -> Option<&dyn Error>
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pub fn source(&self) -> Option<&(dyn Error + 'static)>
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impl Error for LayoutError
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impl Error for TryRecvError
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pub fn description(&self) -> &str
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impl Error for RecvTimeoutError
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pub fn description(&self) -> &str
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impl<W> Error for IntoInnerError<W> where
W: Send + Debug,
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W: Send + Debug,
pub fn description(&self) -> &str
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impl Error for IntoStringError
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impl<T> Error for PoisonError<T>
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pub fn description(&self) -> &str
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impl<T> Error for TrySendError<T> where
T: Send,
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T: Send,
pub fn description(&self) -> &str
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impl Error for TryFromSliceError
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pub fn description(&self) -> &str
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impl<T> Error for SendError<T> where
T: Send,
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T: Send,
pub fn description(&self) -> &str
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impl Error for SystemTimeError
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pub fn description(&self) -> &str
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impl Error for VarError
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pub fn description(&self) -> &str
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impl Error for FromVecWithNulError
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impl Error for RecvError
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pub fn description(&self) -> &str
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impl Error for AccessError
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impl Error for RecvError
impl<T> Error for SendError<T>
impl Error for TryRecvError
impl<T> Error for TrySendError<T>
impl Error for PopError
impl<T> Error for PushError<T> where
T: Debug,
T: Debug,
impl Error for Error
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pub fn description(&self) -> &str
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impl Error for ReadError
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impl Error for BernoulliError
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impl Error for WeightedError
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impl Error for Error
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impl Error for Error
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impl Error for Error
pub fn description(&self) -> &str
impl Error for Error
pub fn description(&self) -> &str
impl Error for CaseFoldError
impl Error for Error
pub fn description(&self) -> &str
impl Error for UnicodeWordError
impl Error for Error
pub fn description(&self) -> &str
impl Error for Error
pub fn description(&self) -> &str
impl Error for ParseError
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pub fn description(&self) -> &str
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impl Error for RoundingError
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pub fn description(&self) -> &str
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impl Error for OutOfRangeError
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pub fn description(&self) -> &str
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impl Error for ParseError
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pub fn description(&self) -> &str
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impl Error for Error
pub fn description(&self) -> &str
impl Error for ParseBigIntError
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pub fn description(&self) -> &str
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impl<E> Error for ParseComplexError<E> where
E: Error,
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E: Error,
pub fn description(&self) -> &str
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impl Error for ParseRatioError
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pub fn description(&self) -> &str
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impl Error for Error
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impl Error for InvalidOutputSize
impl Error for Error
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pub fn description(&self) -> &str
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impl Error for DecodeError
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
impl Error for Error
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impl Error for Error
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impl Error for TryRecvError
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impl Error for RecvError
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impl<T> Error for SendError<T> where
T: Debug,
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T: Debug,
impl<T> Error for SendError<T> where
T: Debug,
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T: Debug,
impl Error for AcquireError
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impl Error for TryLockError
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impl Error for Error
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impl Error for TryAcquireError
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impl Error for TryRecvError
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impl Error for RecvError
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impl Error for JoinError
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impl Error for ReuniteError
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impl Error for RecvError
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impl Error for RecvError
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impl<T> Error for SendError<T> where
T: Debug,
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T: Debug,
impl<T> Error for TrySendError<T> where
T: Debug,
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T: Debug,
impl<T> Error for SendTimeoutError<T> where
T: Debug,
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T: Debug,
impl Error for Elapsed
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impl Error for ReuniteError
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impl<S> Error for HandshakeError<S> where
S: Any + Debug,
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S: Any + Debug,
impl Error for Error
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impl Error for ErrorStack
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impl<S> Error for HandshakeError<S> where
S: Debug,
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S: Debug,
impl Error for Error
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impl Error for Error
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impl Error for X509VerifyResult
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impl Error for Error
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impl Error for NoTlsError
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impl Error for DbError
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impl Error for Aborted
impl<T, Item> Error for ReuniteError<T, Item> where
T: Any,
T: Any,
impl<T> Error for ReuniteError<T> where
T: Any,
T: Any,
impl Error for SpawnError
impl<T> Error for TrySendError<T> where
T: Any,
T: Any,
impl Error for Canceled
impl Error for TryRecvError
impl Error for SendError
impl Error for EnterError
impl Error for LinesCodecError
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impl Error for LengthDelimitedCodecError
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impl Error for ParseAuthError
impl Error for ParseDsnError
impl Error for ParseSessionStatusError
impl Error for ParseProjectIdError
impl Error for ParseLevelError
impl Error for ParseError
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impl Error for ParseDebugIdError
impl Error for ParseCodeIdError
impl Error for BernoulliError
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impl Error for WeightedError
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impl Error for ReadError
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impl Error for Error
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
impl Error for Error
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impl Error for Error
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impl Error for InvalidHeaderName
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impl Error for ToStrError
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impl Error for InvalidUriParts
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impl Error for InvalidUri
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impl Error for InvalidStatusCode
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impl Error for InvalidMethod
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impl Error for InvalidHeaderValue
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impl Error for RecvError
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impl Error for TryRecvError
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impl<T> Error for SendTimeoutError<T> where
T: Debug,
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T: Debug,
impl Error for Elapsed
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impl Error for ReuniteError
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impl Error for RecvError
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impl Error for ClosedError
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impl Error for TryRecvError
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impl Error for TryCurrentError
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impl Error for Error
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impl Error for JoinError
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impl<T> Error for SendError<T> where
T: Debug,
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T: Debug,
impl Error for RecvError
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impl<T> Error for SendError<T> where
T: Debug,
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T: Debug,
impl Error for TryRecvError
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impl Error for TryLockError
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impl<T> Error for TrySendError<T> where
T: Debug,
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T: Debug,
impl Error for Error
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impl Error for InvalidNameError
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impl Error for SetGlobalDefaultError
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impl Error for ParseLevelFilterError
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impl Error for ParseLevelError
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impl Error for Error
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impl Error for LengthDelimitedCodecError
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impl Error for LinesCodecError
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impl Error for Error
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pub fn description(&self) -> &str
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impl Error for FromStrError
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pub fn description(&self) -> &str
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impl Error for Error
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
replaced by Error::source, which can support downcasting
The lower-level cause of this error, in the case of a Utf8
error.
pub fn source(&self) -> Option<&(dyn Error + 'static)>
The lower-level source of this error, in the case of a Utf8
error.
impl Error for AddrParseError
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pub fn description(&self) -> &str
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impl Error for PrefixLenError
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pub fn description(&self) -> &str
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impl Error for Error
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impl Error for InvalidNameError
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impl Error for Error
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impl Error for Error
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impl Error for Error
Loading content...Implementors
impl Error for SendErrorReason
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impl Error for af_lib::env::VarError
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impl Error for WorkingPathError
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impl Error for af_lib::postgres::Error
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impl Error for af_lib::prelude::af_core::test::runner::Error
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impl Error for Infallible
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pub fn description(&self) -> &str
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impl Error for af_lib::slack::api::Error
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impl Error for af_lib::slack::chat::Error
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impl Error for af_lib::channel::ClosedError
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impl Error for af_lib::fmt::Error
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pub fn description(&self) -> &str
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impl Error for WasNull
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impl Error for WrongType
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impl Error for PanickedTask
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impl Error for af_lib::prelude::af_core::task::Canceled
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impl Error for BorrowError
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pub fn description(&self) -> &str
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impl Error for BorrowMutError
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pub fn description(&self) -> &str
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impl Error for CharTryFromError
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pub fn description(&self) -> &str
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impl Error for DecodeUtf16Error
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pub fn description(&self) -> &str
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impl Error for ParseCharError
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pub fn description(&self) -> &str
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impl Error for af_lib::prelude::af_core::test::prelude::json::Error
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impl Error for ParseBoolError
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pub fn description(&self) -> &str
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impl Error for Utf8Error
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pub fn description(&self) -> &str
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impl Error for Panic
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impl<E> Error for FailedTask<E> where
E: Debug + Display,
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E: Debug + Display,
impl<I> Error for ExactlyOneError<I> where
I: Iterator + Debug,
<I as Iterator>::Item: Debug,
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I: Iterator + Debug,
<I as Iterator>::Item: Debug,