Enum Error 

pub enum Error {
    InvalidOption {
        option: String,
    },
    InvalidArgument {
        arg: String,
    },
    InvalidCommand {
        arg: String,
    },
    MissingArgument {
        arg: String,
    },
    MissingChoice {
        alternatives: Vec<String>,
    },
    MissingValue {
        option: String,
    },
    UnexpectedValue {
        option: String,
        value: String,
    },
    ConflictingArguments {
        arg0: String,
        arg1: String,
    },
    ParsingFailed {
        value: String,
        error: Box<dyn Error + Send + Sync + 'static>,
    },
    Version {
        message: String,
    },
    Help {
        message: String,
    },
}

Errors returned by argument parser.

Variants

InvalidOption

Invalid option.

Fields

option: String

The option.

InvalidArgument

Invalid argument.

Fields

arg: String

The argument.

InvalidCommand

Invalid command.

Fields

arg: String

The argument.

MissingArgument

Missing argument.

Fields

arg: String

The argument.

MissingChoice

Missing choice.

Fields

alternatives: Vec<String>

The alternatives.

MissingValue

Missing value for option.

Fields

option: String

The option.

UnexpectedValue

Unexpected value for option.

Fields

option: String

The option.

value: String

The value.

ConflictingArguments

Conflicting arguments.

Fields

arg0: String

First argument.

arg1: String

Second argument.

ParsingFailed

Failed to parse value.

Fields

value: String

The value.

error: Box<dyn Error + Send + Sync + 'static>

The error returned by str::parse().

Version

Version information requested. Returned if option --version was used.

Fields

message: String

The automatically generated version message.

Help

Help requested. Returned if option -h or --help was used.

Fields

message: String

The automatically generated help message.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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.