[][src]Struct rustc::ty::inhabitedness::DefIdForest

pub struct DefIdForest {
    root_ids: SmallVec<[DefId; 1]>,
}
🔬 This is a nightly-only experimental API. (rustc_private)

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Represents a forest of DefIds closed under the ancestor relation. That is, if a DefId representing a module is contained in the forest then all DefIds defined in that module or submodules are also implicitly contained in the forest.

This is used to represent a set of modules in which a type is visibly uninhabited.

Fields

🔬 This is a nightly-only experimental API. (rustc_private)

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The minimal set of DefIds required to represent the whole set. If A and B are DefIds in the DefIdForest, and A is a descendant of B, then only B will be in root_ids. We use a SmallVec here because (for its use for caching inhabitedness) its rare that this will contain even two ids.

Methods

impl<'a, 'gcx, 'tcx> DefIdForest
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Create an empty forest.

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Create a forest consisting of a single tree representing the entire crate.

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Create a forest containing a DefId and all its descendants.

🔬 This is a nightly-only experimental API. (rustc_private)

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Test whether the forest is empty.

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Test whether the forest contains a given DefId.

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Calculate the intersection of a collection of forests.

🔬 This is a nightly-only experimental API. (rustc_private)

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Calculate the union of a collection of forests.

Trait Implementations

impl Clone for DefIdForest
[src]

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Auto Trait Implementations

impl Send for DefIdForest

impl Sync for DefIdForest

Blanket Implementations

impl<T> MaybeResult for T
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

impl<'a, T> Captures for T where
    T: ?Sized
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
[src]

🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T
[src]

impl<T> Send for T where
    T: ?Sized
[src]

impl<T> Sync for T where
    T: ?Sized
[src]

impl<T> Erased for T