Enum rustc_hir::QPath

pub enum QPath<'hir> {
    Resolved(Option<&'hir Ty<'hir>>, &'hir Path<'hir>),
    TypeRelative(&'hir Ty<'hir>, &'hir PathSegment<'hir>),
    LangItem(LangItem, Span, Option<HirId>),
}

Represents an optionally Self-qualified value/type path or associated extension.

To resolve the path to a DefId, call qpath_res.

Variants

Resolved(Option<&'hir Ty<'hir>>, &'hir Path<'hir>)

Path to a definition, optionally “fully-qualified” with a Self type, if the path points to an associated item in a trait.

E.g., an unqualified path like Clone::clone has None for Self, while <Vec<T> as Clone>::clone has Some(Vec<T>) for Self, even though they both have the same two-segment Clone::clone Path.

TypeRelative(&'hir Ty<'hir>, &'hir PathSegment<'hir>)

Type-related paths (e.g., <T>::default or <T>::Output). Will be resolved by type-checking to an associated item.

UFCS source paths can desugar into this, with Vec::new turning into <Vec>::new, and T::X::Y::method into <<<T>::X>::Y>::method, the X and Y nodes each being a TyKind::Path(QPath::TypeRelative(..)).

LangItem(LangItem, Span, Option<HirId>)

Reference to a #[lang = "foo"] item. HirId of the inner expr.

Implementations

impl<'hir> QPath<'hir>

pub fn span(&self) -> Span

Returns the span of this QPath.

pub fn qself_span(&self) -> Span

Returns the span of the qself of this QPath. For example, () in <() as Trait>::method.

pub fn last_segment_span(&self) -> Span

Returns the span of the last segment of this QPath. For example, method in <() as Trait>::method.

Trait Implementations

impl<'tcx> ArenaAllocatable<'tcx, IsNotCopy> for QPath<'tcx>

fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut Self

fn allocate_from_iter<'a>(
    arena: &'a Arena<'tcx>,
    iter: impl IntoIterator<Item = Self>
) -> &'a mut [Self]

impl<'hir> Debug for QPath<'hir>

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

Formats the value using the given formatter.

impl<'hir, __CTX> HashStable<__CTX> for QPath<'hir>where
    __CTX: HashStableContext,

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

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: 24 bytes

Size for each variant:

• Resolved: 23 bytes
• TypeRelative: 23 bytes
• LangItem: 19 bytes