Enum Error 

#[non_exhaustive]
pub enum Error {
    MissingValue(String),
    UnexpectedArgument(String),
    UnknownOption {
        token: String,
        suggestions: Vec<String>,
    },
    UnknownCommand {
        token: String,
        suggestions: Vec<String>,
    },
    GroupViolation(String),
    MissingPositional(String),
    TooManyPositional(String),
    Callback(Box<dyn Error>),
    Exit(i32),
    User(&'static str),
}

Error type

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

MissingValue(String)

Missing value

UnexpectedArgument(String)

Unexpected argument

UnknownOption

Unknown option

Fields

token: String

Token

suggestions: Vec<String>

Suggestions

UnknownCommand

Unknown command

Fields

token: String

Token

suggestions: Vec<String>

Suggestions

GroupViolation(String)

Group violation

MissingPositional(String)

Missing positional

TooManyPositional(String)

Too many positionals

Callback(Box<dyn Error>)

Callback error

Exit(i32)

Exit with code

User(&'static str)

User error

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.