Struct rustc_ty_utils::opaque_types::OpaqueTypeCollector

struct OpaqueTypeCollector<'tcx> {
    tcx: TyCtxt<'tcx>,
    opaques: Vec<LocalDefId>,
    item: LocalDefId,
    seen: FxHashSet<LocalDefId>,
    span: Option<Span>,
}

Fields

tcx: TyCtxt<'tcx>

opaques: Vec<LocalDefId>

item: LocalDefId

The DefId of the item which we are collecting opaque types for.

seen: FxHashSet<LocalDefId>

Avoid infinite recursion due to recursive declarations.

span: Option<Span>

Implementations

impl<'tcx> OpaqueTypeCollector<'tcx>

fn new(tcx: TyCtxt<'tcx>, item: LocalDefId) -> Self

fn span(&self) -> Span

fn visit_spanned(&mut self, span: Span, value: impl TypeVisitable<TyCtxt<'tcx>>)

fn parent_trait_ref(&self) -> Option<TraitRef<'tcx>>

fn parent(&self) -> Option<LocalDefId>

fn check_tait_defining_scope(&self, opaque_def_id: LocalDefId) -> bool

Returns true if opaque_hir_id is a sibling or a child of a sibling of self.item.

Example:

pub mod foo {
    pub mod bar {
        pub trait Bar { /* ... */ }
        pub type Baz = impl Bar;

        fn f1() -> Baz { /* ... */ }
    }
    fn f2() -> bar::Baz { /* ... */ }
}

and opaque_def_id is the DefId of the definition of the opaque type Baz. For the above example, this function returns true for f1 and false for f2.

fn collect_taits_declared_in_body(&mut self)

Trait Implementations

impl<'tcx> SpannedTypeVisitor<'tcx> for OpaqueTypeCollector<'tcx>

fn visit( &mut self, span: Span, value: impl TypeVisitable<TyCtxt<'tcx>> ) -> ControlFlow<!>

type BreakTy = !

impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for OpaqueTypeCollector<'tcx>

fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<!>

type BreakTy = !

fn visit_binder<T>( &mut self, t: &<I as Interner>::Binder<T> ) -> ControlFlow<Self::BreakTy>

where T: TypeVisitable<I>, <I as Interner>::Binder<T>: TypeSuperVisitable<I>,

fn visit_region( &mut self, _r: <I as Interner>::Region ) -> ControlFlow<Self::BreakTy>

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: 80 bytes