Struct PathLookup

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

Lazily resolves a path into a list of DefIds 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)

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§ns: PathNS§path: &'static [Symbol]§once: OnceLock<Vec<DefId>>

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impl PathLookup

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pub fn get(&self, cx: &LateContext<'_>) -> &[DefId]

Returns the list of DefIds that the path resolves to

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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 DefIds being returned

May return None in no_std/no_core environments

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pub fn matches(&self, cx: &LateContext<'_>, def_id: DefId) -> bool

Checks if the path resolves to the given def_id

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

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

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pub fn matches_ty(&self, cx: &LateContext<'_>, ty: Ty<'_>) -> bool

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

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T, U> TryFrom<U> for T
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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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