struct BoundVarContext<'a, 'tcx> {
    tcx: TyCtxt<'tcx>,
    map: &'a mut NamedVarMap,
    scope: &'a Scope<'a>,
}

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§tcx: TyCtxt<'tcx>§map: &'a mut NamedVarMap§scope: &'a Scope<'a>

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impl<'a, 'tcx> BoundVarContext<'a, 'tcx>

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fn poly_trait_ref_binder_info( &mut self, ) -> (Vec<BoundVariableKind>, BinderScopeType)

Returns the binders in scope and the type of Binder that should be created for a poly trait ref.

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fn visit_poly_trait_ref_inner( &mut self, trait_ref: &'tcx PolyTraitRef<'tcx>, non_lifetime_binder_allowed: NonLifetimeBinderAllowed, )

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impl<'a, 'tcx> BoundVarContext<'a, 'tcx>

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fn with<F>(&mut self, wrap_scope: Scope<'_>, f: F)
where F: for<'b> FnOnce(&mut BoundVarContext<'b, 'tcx>),

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fn record_late_bound_vars( &mut self, hir_id: HirId, binder: Vec<BoundVariableKind>, )

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fn visit_early_late<F>( &mut self, hir_id: HirId, generics: &'tcx Generics<'tcx>, walk: F, )
where F: for<'b, 'c> FnOnce(&'b mut BoundVarContext<'c, 'tcx>),

Visits self by adding a scope and handling recursive walk over the contents with walk.

Handles visiting fns and methods. These are a bit complicated because we must distinguish early- vs late-bound lifetime parameters. We do this by checking which lifetimes appear within type bounds; those are early bound lifetimes, and the rest are late bound.

For example:

fn foo<’a,’b,’c,T:Trait<’b>>(…)

Here 'a and 'c are late bound but 'b is early bound. Note that early- and late-bound lifetimes may be interspersed together.

If early bound lifetimes are present, we separate them into their own list (and likewise for late bound). They will be numbered sequentially, starting from the lowest index that is already in scope (for a fn item, that will be 0, but for a method it might not be). Late bound lifetimes are resolved by name and associated with a binder ID (binder_id), so the ordering is not important there.

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fn visit_early<F>( &mut self, hir_id: HirId, generics: &'tcx Generics<'tcx>, walk: F, )
where F: for<'b, 'c> FnOnce(&'b mut BoundVarContext<'c, 'tcx>),

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fn resolve_lifetime_ref( &mut self, region_def_id: LocalDefId, lifetime_ref: &'tcx Lifetime, )

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fn resolve_type_ref(&mut self, param_def_id: LocalDefId, hir_id: HirId)

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fn visit_segment_args( &mut self, res: Res, depth: usize, generic_args: &'tcx GenericArgs<'tcx>, )

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fn supertrait_hrtb_vars( tcx: TyCtxt<'tcx>, def_id: DefId, assoc_name: Ident, assoc_kind: AssocKind, ) -> Option<(Vec<BoundVariableKind>, &'tcx AssocItem)>

Returns all the late-bound vars that come into scope from supertrait HRTBs, based on the associated type name and starting trait. For example, imagine we have

trait Foo<'a, 'b> {
  type As;
}
trait Bar<'b>: for<'a> Foo<'a, 'b> {}
trait Bar: for<'b> Bar<'b> {}

In this case, if we wanted to the supertrait HRTB lifetimes for As on the starting trait Bar, we would return Some(['b, 'a]).

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fn visit_fn_like_elision( &mut self, inputs: &'tcx [Ty<'tcx>], output: Option<&'tcx Ty<'tcx>>, in_closure: bool, )

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fn resolve_object_lifetime_default(&mut self, lifetime_ref: &'tcx Lifetime)

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fn insert_lifetime(&mut self, lifetime_ref: &'tcx Lifetime, def: ResolvedArg)

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fn uninsert_lifetime_on_error( &mut self, lifetime_ref: &'tcx Lifetime, bad_def: ResolvedArg, )

Sometimes we resolve a lifetime, but later find that it is an error (esp. around impl trait). In that case, we remove the entry into map.defs so as not to confuse later code.

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impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx>

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type NestedFilter = OnlyBodies

Override this type to control which nested HIR are visited; see NestedFilter for details. If you override this type, you must also override nested_visit_map. Read more
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fn nested_visit_map(&mut self) -> Self::Map

If type NestedFilter is set to visit nested items, this method must also be overridden to provide a map to retrieve nested items.
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fn visit_nested_body(&mut self, body: BodyId)

Invoked to visit the body of a function, method or closure. Like visit_nested_item, does nothing by default unless you override Self::NestedFilter.
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fn visit_expr(&mut self, e: &'tcx Expr<'tcx>)

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fn visit_item(&mut self, item: &'tcx Item<'tcx>)

Visits the top-level item and (optionally) nested items / impl items. See visit_nested_item for details.
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fn visit_precise_capturing_arg( &mut self, arg: &'tcx PreciseCapturingArg<'tcx>, ) -> Self::Result

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fn visit_foreign_item(&mut self, item: &'tcx ForeignItem<'tcx>)

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fn visit_ty(&mut self, ty: &'tcx Ty<'tcx>)

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fn visit_pattern_type_pattern(&mut self, p: &'tcx Pat<'tcx>)

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fn visit_trait_item(&mut self, trait_item: &'tcx TraitItem<'tcx>)

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fn visit_impl_item(&mut self, impl_item: &'tcx ImplItem<'tcx>)

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fn visit_lifetime(&mut self, lifetime_ref: &'tcx Lifetime)

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fn visit_path(&mut self, path: &Path<'tcx>, hir_id: HirId)

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fn visit_fn( &mut self, fk: FnKind<'tcx>, fd: &'tcx FnDecl<'tcx>, body_id: BodyId, _: Span, def_id: LocalDefId, )

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fn visit_generics(&mut self, generics: &'tcx Generics<'tcx>)

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fn visit_where_predicate(&mut self, predicate: &'tcx WherePredicate<'tcx>)

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fn visit_poly_trait_ref(&mut self, trait_ref: &'tcx PolyTraitRef<'tcx>)

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fn visit_anon_const(&mut self, c: &'tcx AnonConst)

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fn visit_generic_param(&mut self, p: &'tcx GenericParam<'tcx>)

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type Map = <Self::NestedFilter as NestedFilter<'v>>::Map

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type Result = ()

The result type of the visit_* methods. Can be either (), or ControlFlow<T>.
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fn visit_nested_item(&mut self, id: ItemId) -> Self::Result

Invoked when a nested item is encountered. By default, when Self::NestedFilter is nested_filter::None, this method does nothing. You probably don’t want to override this method – instead, override Self::NestedFilter or use the “shallow” or “deep” visit patterns described at rustc_hir::intravisit. The only reason to override this method is if you want a nested pattern but cannot supply a Map; see nested_visit_map for advice.
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fn visit_nested_trait_item(&mut self, id: TraitItemId) -> Self::Result

Like visit_nested_item(), but for trait items. See visit_nested_item() for advice on when to override this method.
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fn visit_nested_impl_item(&mut self, id: ImplItemId) -> Self::Result

Like visit_nested_item(), but for impl items. See visit_nested_item() for advice on when to override this method.
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fn visit_nested_foreign_item(&mut self, id: ForeignItemId) -> Self::Result

Like visit_nested_item(), but for foreign items. See visit_nested_item() for advice on when to override this method.
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fn visit_param(&mut self, param: &'v Param<'v>) -> Self::Result

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fn visit_body(&mut self, b: &Body<'v>) -> Self::Result

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fn visit_id(&mut self, _hir_id: HirId) -> Self::Result

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fn visit_name(&mut self, _name: Symbol) -> Self::Result

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fn visit_ident(&mut self, ident: Ident) -> Self::Result

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fn visit_mod(&mut self, m: &'v Mod<'v>, _s: Span, n: HirId) -> Self::Result

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fn visit_local(&mut self, l: &'v LetStmt<'v>) -> Self::Result

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fn visit_block(&mut self, b: &'v Block<'v>) -> Self::Result

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fn visit_stmt(&mut self, s: &'v Stmt<'v>) -> Self::Result

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fn visit_arm(&mut self, a: &'v Arm<'v>) -> Self::Result

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fn visit_pat(&mut self, p: &'v Pat<'v>) -> Self::Result

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fn visit_pat_field(&mut self, f: &'v PatField<'v>) -> Self::Result

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fn visit_array_length(&mut self, len: &'v ArrayLen<'v>) -> Self::Result

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fn visit_inline_const(&mut self, c: &'v ConstBlock) -> Self::Result

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fn visit_const_arg(&mut self, c: &'v ConstArg<'v>) -> Self::Result

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fn visit_expr_field(&mut self, field: &'v ExprField<'v>) -> Self::Result

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fn visit_const_param_default( &mut self, _param: HirId, ct: &'v ConstArg<'v>, ) -> Self::Result

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fn visit_fn_ret_ty(&mut self, ret_ty: &'v FnRetTy<'v>) -> Self::Result

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fn visit_fn_decl(&mut self, fd: &'v FnDecl<'v>) -> Self::Result

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fn visit_use( &mut self, path: &'v Path<'v, SmallVec<[Res; 3]>>, hir_id: HirId, ) -> Self::Result

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fn visit_trait_item_ref(&mut self, ii: &'v TraitItemRef) -> Self::Result

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fn visit_foreign_item_ref(&mut self, ii: &'v ForeignItemRef) -> Self::Result

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fn visit_impl_item_ref(&mut self, ii: &'v ImplItemRef) -> Self::Result

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fn visit_trait_ref(&mut self, t: &'v TraitRef<'v>) -> Self::Result

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fn visit_param_bound(&mut self, bounds: &'v GenericBound<'v>) -> Self::Result

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fn visit_variant_data(&mut self, s: &'v VariantData<'v>) -> Self::Result

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fn visit_field_def(&mut self, s: &'v FieldDef<'v>) -> Self::Result

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fn visit_enum_def( &mut self, enum_definition: &'v EnumDef<'v>, item_id: HirId, ) -> Self::Result

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fn visit_variant(&mut self, v: &'v Variant<'v>) -> Self::Result

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fn visit_label(&mut self, label: &'v Label) -> Self::Result

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fn visit_infer(&mut self, inf: &'v InferArg) -> Self::Result

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fn visit_generic_arg(&mut self, generic_arg: &'v GenericArg<'v>) -> Self::Result

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fn visit_qpath( &mut self, qpath: &'v QPath<'v>, id: HirId, _span: Span, ) -> Self::Result

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fn visit_path_segment( &mut self, path_segment: &'v PathSegment<'v>, ) -> Self::Result

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fn visit_generic_args( &mut self, generic_args: &'v GenericArgs<'v>, ) -> Self::Result

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fn visit_assoc_item_constraint( &mut self, constraint: &'v AssocItemConstraint<'v>, ) -> Self::Result

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fn visit_attribute(&mut self, _attr: &'v Attribute) -> Self::Result

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fn visit_associated_item_kind( &mut self, kind: &'v AssocItemKind, ) -> Self::Result

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fn visit_defaultness(&mut self, defaultness: &'v Defaultness) -> Self::Result

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fn visit_inline_asm( &mut self, asm: &'v InlineAsm<'v>, id: HirId, ) -> Self::Result

Auto Trait Implementations§

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impl<'a, 'tcx> Freeze for BoundVarContext<'a, 'tcx>

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impl<'a, 'tcx> !RefUnwindSafe for BoundVarContext<'a, 'tcx>

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impl<'a, 'tcx> !Send for BoundVarContext<'a, 'tcx>

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impl<'a, 'tcx> !Sync for BoundVarContext<'a, 'tcx>

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impl<'a, 'tcx> Unpin for BoundVarContext<'a, 'tcx>

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impl<'a, 'tcx> !UnwindSafe for BoundVarContext<'a, 'tcx>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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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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impl<T> Borrow<T> for T
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
where T: ?Sized,

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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, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. 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> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for T
where U: Into<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.
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impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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fn upcast(self, interner: I) -> U

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impl<I, T> UpcastFrom<I, T> for T

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fn upcast_from(from: T, _tcx: I) -> T

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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T

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: 24 bytes