Struct Mark

pub struct Mark(/* private fields */);

A mark is a unique id associated with a macro expansion.

Implementations

impl Mark

pub fn new() -> Self

Shortcut for Mark::fresh(Mark::root())

pub fn fresh(parent: Mark) -> Self

pub const fn root() -> Self

The mark of the theoretical expansion that generates freshly parsed, unexpanded AST.

pub fn as_u32(self) -> u32

pub fn from_u32(raw: u32) -> Mark

pub fn parent(self) -> Mark

pub fn is_descendant_of(self, ancestor: Mark) -> bool

pub fn least_ancestor(a: Mark, b: Mark) -> Mark

Computes a mark such that both input marks are descendants of (or equal to) the returned mark. That is, the following holds:

let la = least_ancestor(a, b);
assert!(a.is_descendant_of(la))
assert!(b.is_descendant_of(la))

Trait Implementations

impl Clone for Mark

fn clone(&self) -> Mark

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Mark

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

Formats the value using the given formatter.

impl Default for Mark

fn default() -> Self

Returns the “default value” for a type.

impl Hash for Mark

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Mark

fn eq(&self, other: &Mark) -> 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 Copy for Mark

impl Eq for Mark

impl StructuralPartialEq for Mark