Struct rustc_middle::ty::OpaqueHiddenType

pub struct OpaqueHiddenType<'tcx> {
    pub span: Span,
    pub ty: Ty<'tcx>,
}

Fields

span: Span

The span of this particular definition of the opaque type. So for example:

type Foo = impl Baz;
fn bar() -> Foo {
//          ^^^ This is the span we are looking for!
}

In cases where the fn returns (impl Trait, impl Trait) or other such combinations, the result is currently over-approximated, but better than nothing.

ty: Ty<'tcx>

The type variable that represents the value of the opaque type that we require. In other words, after we compile this function, we will be created a constraint like:

Foo<'a, T> = ?C

where ?C is the value of this type variable. =) It may naturally refer to the type and lifetime parameters in scope in this function, though ultimately it should only reference those that are arguments to Foo in the constraint above. (In other words, ?C should not include 'b, even though it’s a lifetime parameter on foo.)

Implementations

impl<'tcx> OpaqueHiddenType<'tcx>

pub fn report_mismatch(&self, other: &Self, tcx: TyCtxt<'tcx>)

pub fn remap_generic_params_to_declaration_params(
    self,
    opaque_type_key: OpaqueTypeKey<'tcx>,
    tcx: TyCtxt<'tcx>,
    ignore_errors: bool,
    origin: OpaqueTyOrigin
) -> Self

Trait Implementations

impl<'tcx> Clone for OpaqueHiddenType<'tcx>

fn clone(&self) -> OpaqueHiddenType<'tcx>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx> Debug for OpaqueHiddenType<'tcx>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'tcx, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for OpaqueHiddenType<'tcx>

fn decode(__decoder: &mut __D) -> Self

impl<'tcx, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for OpaqueHiddenType<'tcx>

fn encode(&self, __encoder: &mut __E)

impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for OpaqueHiddenType<'tcx>

fn hash_stable(
    &self,
    __hcx: &mut StableHashingContext<'__ctx>,
    __hasher: &mut StableHasher
)

impl<'tcx> TypeFoldable<'tcx> for OpaqueHiddenType<'tcx>

fn try_fold_with<__F: FallibleTypeFolder<'tcx>>(
    self,
    __folder: &mut __F
) -> Result<Self, __F::Error>

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f).

fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.

impl<'tcx> TypeVisitable<'tcx> for OpaqueHiddenType<'tcx>

fn visit_with<__V: TypeVisitor<'tcx>>(
    &self,
    __visitor: &mut __V
) -> ControlFlow<__V::BreakTy>

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v).

fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.

fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool

Returns true if this type has any regions that escape binder (and hence are not bound by it).

fn has_escaping_bound_vars(&self) -> bool

Return true if this type has regions that are not a part of the type. For example, for<'a> fn(&'a i32) return false, while fn(&'a i32) would return true. The latter can occur when traversing through the former.

fn has_type_flags(&self, flags: TypeFlags) -> bool

fn has_projections(&self) -> bool

fn has_opaque_types(&self) -> bool

fn references_error(&self) -> bool

fn error_reported(&self) -> Result<(), ErrorGuaranteed>

fn has_non_region_param(&self) -> bool

fn has_infer_regions(&self) -> bool

fn has_infer_types(&self) -> bool

fn has_non_region_infer(&self) -> bool

fn needs_infer(&self) -> bool

fn has_placeholders(&self) -> bool

fn needs_subst(&self) -> bool

fn has_free_regions(&self) -> bool

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.

fn has_erased_regions(&self) -> bool

fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.

fn is_global(&self) -> bool

Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching.

fn has_late_bound_regions(&self) -> bool

True if there are any late-bound regions

fn still_further_specializable(&self) -> bool

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.

impl<'tcx> Copy for OpaqueHiddenType<'tcx>

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: 16 bytes