Enum Quirk 

pub enum Quirk {
    LineNumber,
}

Special characteristics of a variable

While most variables act as a simple store of a value, some variables exhibit special effects when they get expanded or assigned to. Such variables may have their value computed dynamically on expansion or may have an internal state that is updated when the value is set. Quirk determines the nature of a variable and contains the relevant state.

Use Variable::expand to apply the variable’s quirk when expanding a variable.

Variants

LineNumber

Quirk for the $LINENO variable

The value of a variable having this variant of Quirk is computed dynamically from the expanding context. The result is the line number of the location of the parameter expansion. This Quirk is lost when an assignment sets a new value to the variable.

Trait Implementations

impl Clone for Quirk

fn clone(&self) -> Quirk

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Quirk

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

Formats the value using the given formatter.

impl PartialEq for Quirk

fn eq(&self, other: &Quirk) -> 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 Eq for Quirk

impl StructuralPartialEq for Quirk