Struct PathLookup 

pub struct PathLookup {
    ns: PathNS,
    path: &'static [Symbol],
    once: OnceLock<Vec<DefId>>,
}

Lazily resolves a path into a list of [DefId]s using lookup_path.

Typically it will contain one [DefId] or none, but in some situations there can be multiple:

• memchr::memchr could return the functions from both memchr 1.0 and memchr 2.0
• alloc::boxed::Box::downcast would return a function for each of the different inherent impls (1, 2, 3)

Fields

ns: PathNS

path: &'static [Symbol]

once: OnceLock<Vec<DefId>>

Implementations

impl PathLookup

pub fn get<'tcx>(&self, tcx: &impl HasTyCtxt<'tcx>) -> &[DefId]

Returns the list of [DefId]s that the path resolves to

pub fn only(&self, cx: &LateContext<'_>) -> Option<DefId>

Returns the single [DefId] that the path resolves to, this can only be used for paths into stdlib crates to avoid the issue of multiple [DefId]s being returned

May return None in no_std/no_core environments

pub fn matches<'tcx>(&self, tcx: &impl HasTyCtxt<'tcx>, def_id: DefId) -> bool

Checks if the path resolves to the given def_id

pub fn matches_path<'tcx>( &self, cx: &LateContext<'_>, maybe_path: impl MaybeQPath<'tcx>, ) -> bool

Resolves maybe_path to a [DefId] and checks if the PathLookup matches it

pub fn matches_ty<'tcx>(&self, tcx: &impl HasTyCtxt<'tcx>, ty: Ty<'_>) -> bool

Checks if the path resolves to ty’s definition, must be an Adt

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: 56 bytes