pub struct DefIdForest {
root_ids: SmallVec<[DefId; 1]>,
}
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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.
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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.
🔬 This is a nightly-only experimental API. (rustc_private
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🔬 This is a nightly-only experimental API. (rustc_private
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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.
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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.
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Calculate the union of a collection of forests.
Performs copy-assignment from source
. Read more
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🔬 This is a nightly-only experimental API. (rustc_private
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Creates owned data from borrowed data, usually by cloning. Read more
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recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (try_from
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The type returned in the event of a conversion error.
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Immutably borrows from an owned value. Read more
type Error = <U as TryFrom<T>>::Error
🔬 This is a nightly-only experimental API. (try_from
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The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
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Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (get_type_id
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this method will likely be replaced by an associated static
🔬 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