Struct ExpnId

pub struct ExpnId {
    pub krate: CrateNum,
    pub local_id: ExpnIndex,
}

A unique ID associated with a macro invocation and expansion.

Fields

krate: CrateNum

local_id: ExpnIndex

Implementations

impl ExpnId

pub const fn root() -> ExpnId

The ID of the theoretical expansion that generates freshly parsed, unexpanded AST. Invariant: we do not create any ExpnId with local_id == 0 and krate != 0.

pub fn expn_hash(self) -> ExpnHash

pub fn from_hash(hash: ExpnHash) -> Option<ExpnId>

pub fn as_local(self) -> Option<LocalExpnId>

pub fn expect_local(self) -> LocalExpnId

pub fn expn_data(self) -> ExpnData

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

pub fn outer_expn_is_descendant_of(self, ctxt: SyntaxContext) -> bool

expn_id.outer_expn_is_descendant_of(ctxt) is equivalent to but faster than expn_id.is_descendant_of(ctxt.outer_expn()).

pub fn expansion_cause(self) -> Option<Span>

Returns span for the macro which originally caused this expansion to happen.

Stops backtracing at include! boundary.

Trait Implementations

impl Clone for ExpnId

fn clone(&self) -> ExpnId

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ExpnId

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

Formats the value using the given formatter.

impl<D: SpanDecoder> Decodable<D> for ExpnId

fn decode(s: &mut D) -> ExpnId

impl<E: SpanEncoder> Encodable<E> for ExpnId

fn encode(&self, s: &mut E)

impl Hash for ExpnId

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<CTX: HashStableContext> HashStable<CTX> for ExpnId

fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)

impl PartialEq for ExpnId

fn eq(&self, other: &ExpnId) -> 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 ExpnId

impl Eq for ExpnId

impl StructuralPartialEq for ExpnId

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: 8 bytes