Struct SubcommandError 

pub struct SubcommandError { /* private fields */ }

Error returned when subcommand dispatch cannot select a command.

Implementations

impl SubcommandError

pub fn missing(expected: Vec<String>) -> Self

Create a missing-subcommand error.

pub fn unknown(command: String, expected: Vec<String>) -> Self

Create an unknown-subcommand error.

pub fn command(&self) -> Option<&str>

Return the unknown subcommand, or None when no subcommand was provided.

pub fn expected(&self) -> &[String]

Return the expected command names.

Trait Implementations

impl Clone for SubcommandError

fn clone(&self) -> SubcommandError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SubcommandError

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

Formats the value using the given formatter.

impl Display for SubcommandError

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

Formats the value using the given formatter.

impl Error for SubcommandError

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

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for SubcommandError

fn eq(&self, other: &SubcommandError) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for SubcommandError

impl StructuralPartialEq for SubcommandError