Enum ap::Error[−][src]

pub enum Error {
    NoHandler,
    NoArgs,
    UnknownOpt,
    MissingOptName,
    MissingOptArg,
    MissingReqOpt,
    NoPosnArgs,
    NoBundling,
    NoLongOpts,
    HandlerError(String),
    GenericError(String),
    IOError(Error),
}
Expand description

The error type that represents all possible parse errors and handler errors.

Variants

NoHandler

No handler means nothing will happen.

NoArgs

No registered arguments means nothing will happen.

UnknownOpt

User specified an unknown option.

MissingOptName

User specified an invalid argument that looks like an option but doesn’t have a name.

MissingOptArg

Option argument was not specified.

MissingReqOpt

An option that must be specified was not specified.

NoPosnArgs

Positional arguments are not permitted by default.

To allow them, either register an Arg for POSITIONAL_HANDLER_OPT, or set Settings.ignore_unknown_posn_args.

NoBundling

Options must be kept separate on the command line (-d -a foo rather than -da foo).

NoLongOpts

Option names can only be a single character long (-v rather than, say, --verbose).

HandlerError(String)

Custom error that a handler can use if the other errors are not appropriate.

GenericError(String)

An unknown error (used for testing).

IOError(Error)

An I/O error

Trait Implementations

impl Debug for Error[src]

fn fmt(&self, f: &mut Formatter<'_>) -> Result[src]

Formats the value using the given formatter. Read more

impl Display for Error[src]

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result[src]

Formats the value using the given formatter. Read more

impl Error for Error[src]

fn source(&self) -> Option<&(dyn Error + 'static)>[src]

The lower-level source of this error, if any. Read more

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) -> &str1.0.0[src]

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

Read more

fn cause(&self) -> Option<&dyn Error>1.0.0[src]

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

impl From<Error> for Error[src]

fn from(source: Error) -> Self[src]

Performs the conversion.

Auto Trait Implementations

impl !RefUnwindSafe for Error

impl Send for Error

impl Sync for Error

impl Unpin for Error

impl !UnwindSafe for Error

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized, [src]

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
    T: ?Sized, [src]

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src]

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

impl<T, U> Into<U> for T where
    U: From<T>, [src]

pub fn into(self) -> U[src]

Performs the conversion.

impl<T> ToString for T where
    T: Display + ?Sized, [src]

pub default fn to_string(&self) -> String[src]

Converts the given value to a String. Read more

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src]

type Error = Infallible

The type returned in the event of a conversion error.

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

Performs the conversion.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

Performs the conversion.