Enum FlagError

pub enum FlagError {
    BadFlag {
        flag: String,
    },
    UnknownFlag {
        name: String,
    },
    ArgumentNeeded {
        name: String,
    },
    ParseError {
        error: FlagParseError,
    },
}

Common errors for flag parsing.

Variants

BadFlag

Bad flag syntax. E.g. --=foo

Fields

flag: String

UnknownFlag

Flag provided but not defined.

Fields

name: String

ArgumentNeeded

Flag needs an argument.

Fields

name: String

ParseError

Failed to parse a flag argument. E.g. --lines=10XYZ

Fields

error: FlagParseError

Trait Implementations

impl Debug for FlagError

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

Formats the value using the given formatter.

impl Display for FlagError

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

Formats the value using the given formatter.

impl Error for FlagError

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

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

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

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.