Struct rustc::middle::region::ScopeTree

pub struct ScopeTree { /* fields omitted */ }

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The region scope tree encodes information about region relationships.

Methods

impl<'tcx> ScopeTree

pub fn record_scope_parent(&mut self, child: Scope, parent: Option<Scope>)

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pub fn each_encl_scope<E>(&self, e: E) where
    E: FnMut(Scope, Scope), 

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pub fn each_var_scope<E>(&self, e: E) where
    E: FnMut(&ItemLocalId, Scope), 

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pub fn opt_destruction_scope(&self, n: ItemLocalId) -> Option<Scope>

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pub fn opt_encl_scope(&self, id: Scope) -> Option<Scope>

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Returns the narrowest scope that encloses id, if any.

pub fn encl_scope(&self, id: Scope) -> Scope

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Returns the narrowest scope that encloses id, if any.

pub fn var_scope(&self, var_id: ItemLocalId) -> Scope

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Returns the lifetime of the local variable var_id

pub fn temporary_scope(&self, expr_id: ItemLocalId) -> Option<Scope>

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Returns the scope when temp created by expr_id will be cleaned up

pub fn var_region(&self, id: ItemLocalId) -> RegionKind

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Returns the lifetime of the variable id.

pub fn scopes_intersect(&self, scope1: Scope, scope2: Scope) -> bool

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pub fn is_subscope_of(&self, subscope: Scope, superscope: Scope) -> bool

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Returns true if subscope is equal to or is lexically nested inside superscope and false otherwise.

pub fn nearest_common_ancestor(&self, scope_a: Scope, scope_b: Scope) -> Scope

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Finds the nearest common ancestor (if any) of two scopes. That is, finds the smallest scope which is greater than or equal to both scope_a and scope_b.

pub fn early_free_scope<'a, 'gcx>(
    &self,
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    br: &EarlyBoundRegion
) -> Scope

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Assuming that the provided region was defined within this ScopeTree, returns the outermost Scope that the region outlives.

pub fn free_scope<'a, 'gcx>(
    &self,
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    fr: &FreeRegion
) -> Scope

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Assuming that the provided region was defined within this ScopeTree, returns the outermost Scope that the region outlives.

pub fn yield_in_scope(&self, scope: Scope) -> Option<(Span, usize)>

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Checks whether the given scope contains a yield. If so, returns Some((span, expr_count)) with the span of a yield we found and the number of expressions appearing before the yield in the body.

pub fn body_expr_count(&self, body_id: BodyId) -> Option<usize>

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Gives the number of expressions visited in a body. Used to sanity check visit_expr call count when calculating generator interiors.

Trait Implementations

impl Default for ScopeTree

fn default() -> ScopeTree

Returns the "default value" for a type.

impl Debug for ScopeTree

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl<'gcx> HashStable<StableHashingContext<'gcx>> for ScopeTree

fn hash_stable<W: StableHasherResult>(
    &self,
    hcx: &mut StableHashingContext<'gcx>,
    hasher: &mut StableHasher<W>
)

🔬 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?