Enum WhichMatcher 

pub(crate) enum WhichMatcher {
    Args,
    Body,
}

A selection of a matcher in a MacroRule.

MacroRule::Attr has two different matchers (args and body). This enum allows distinguishing between them, even when used for other kinds of rules.

This type implements Ord. The arms within a rule come in a fixed order and this type is consistent with that ordering.

Variants

Args

The arguments of an attr macro (MacroRule::Attr::args).

Body

The body of an attr macro (MacroRule::Attr::body), or the only arm of the rule.

This is also used to express the only arm in a MacroRule::Func or MacroRule::Derive.

Implementations

impl WhichMatcher

pub(crate) const FOR_FUNC: Self = Self::Body

The WhichMatcher for MacroRule::Func.

pub(crate) const FOR_DERIVE: Self = Self::Body

The WhichMatcher for MacroRule::Derive.

Trait Implementations

impl Clone for WhichMatcher

fn clone(&self) -> WhichMatcher

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for WhichMatcher

impl Debug for WhichMatcher

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

Formats the value using the given formatter.

impl Eq for WhichMatcher

impl Ord for WhichMatcher

fn cmp(&self, other: &WhichMatcher) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for WhichMatcher

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for WhichMatcher

fn partial_cmp(&self, other: &WhichMatcher) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for WhichMatcher

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• Args: 0 bytes
• Body: 0 bytes