Enum UnknownFlags 

pub enum UnknownFlags {
    Value,
    Error,
}

What to do with a flag-like token that names no flag in scope.

The default is UnknownFlags::Value: the token carries on to the positional arguments, because a spec is often parsing a command line whose flags belong to something else — a wrapped tool, a task script. A CLI that owns all of its flags declares UnknownFlags::Error and gets typo detection instead.

Stored per command and already resolved: inheritance is a question for whoever builds the tables, and answering it at compile time keeps it out of the parse.

Variants

Value

Offer the token to the positionals. If none can take it, it is an unexpected argument.

Error

Reject the token.

Trait Implementations

impl Clone for UnknownFlags

fn clone(&self) -> UnknownFlags

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for UnknownFlags

impl Debug for UnknownFlags

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

Formats the value using the given formatter.

impl Default for UnknownFlags

fn default() -> UnknownFlags

Returns the “default value” for a type.

impl Eq for UnknownFlags

impl PartialEq for UnknownFlags

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for UnknownFlags