Enum kailua_types::ty::Nil

pub enum Nil {
    Silent,
    Noisy,
    Absent,
}

Different kinds of nil.

Variants

Silent

nil is assumed to be present, but the assumption is not checked.

Noisy

nil is assumed to be present, and the assumption gets checked (e.g. integer? doesn't support arithmetic operations).

Absent

nil is assumed to be absent.

Methods

impl Nil

fn with_nil(&self) -> Nil

fn without_nil(&self) -> Nil

fn union(&self, other: Nil) -> Nil

fn is_sub(&self, other: Nil) -> bool

fn is_eq(&self, other: Nil) -> bool

Trait Implementations

impl Copy for Nil

impl Clone for Nil

fn clone(&self) -> Nil

Returns a copy of the value.

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

Performs copy-assignment from source.

impl PartialEq for Nil

fn eq(&self, __arg_0: &Nil) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl Eq for Nil

impl Debug for Nil

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.