Enum go_flag::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 of BadFlag

flag: String

UnknownFlag

Flag provided but not defined.

Fields of UnknownFlag

name: String

ArgumentNeeded

Flag needs an argument.

Fields of ArgumentNeeded

name: String

ParseError

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

Fields of ParseError

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

This method is soft-deprecated.

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

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

The lower-level cause of this error, if any.

fn backtrace(&self) -> Option<&Backtrace>

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

Returns a stack backtrace, if available, of where this error ocurred.