Enum UnknownTolerance 

pub enum UnknownTolerance {
    Strict,
    Short,
    Long,
    Both,
}

Whether unrecognized flag-shaped tokens are denied or silently accepted as positional arguments. The default (Strict) makes the allowlist authoritative — any unrecognized -X or --foo is denied.

Variants

Strict

Deny every unrecognized flag-shaped token. The safe default.

Short

Accept unknown single-dash tokens (-X, -help, -mayDie) as positional. Reject unknown double-dash. Use for tools like pdftotext that have single-dash long flags.

Long

Accept unknown double-dash tokens (--foo, --foo=value) as positional. Reject unknown single-dash. Dangerous: most modern destructive flags are double-dash, so enabling this can silently accept mutating options. Reserved for tools with genuinely unbounded long-flag surfaces (AWS CLI service flags).

Both

Accept both single-dash and double-dash unknowns as positional. Most permissive; combines the cost of Short and Long.

Implementations

impl UnknownTolerance

pub const fn allows_short(self) -> bool

pub const fn allows_long(self) -> bool

Trait Implementations

impl Clone for UnknownTolerance

fn clone(&self) -> UnknownTolerance

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for UnknownTolerance

impl Debug for UnknownTolerance

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

Formats the value using the given formatter.

impl Default for UnknownTolerance

fn default() -> UnknownTolerance

Returns the “default value” for a type.

impl Eq for UnknownTolerance

impl PartialEq for UnknownTolerance

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for UnknownTolerance