Struct rustc_middle::ty::sty::AliasTy

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pub struct AliasTy<'tcx> {
    pub args: GenericArgsRef<'tcx>,
    pub def_id: DefId,
    _use_alias_ty_new_instead: (),
}
Expand description

Represents the projection of an associated type.

  • For a projection, this would be <Ty as Trait<...>>::N<...>.
  • For an inherent projection, this would be Ty::N<...>.
  • For an opaque type, there is no explicit syntax.

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§args: GenericArgsRef<'tcx>

The parameters of the associated or opaque item.

For a projection, these are the substitutions for the trait and the GAT substitutions, if there are any.

For an inherent projection, they consist of the self type and the GAT substitutions, if there are any.

For RPIT the substitutions are for the generics of the function, while for TAIT it is used for the generic parameters of the alias.

§def_id: DefId

The DefId of the TraitItem or ImplItem for the associated type N depending on whether this is a projection or an inherent projection or the DefId of the OpaqueType item if this is an opaque.

During codegen, tcx.type_of(def_id) can be used to get the type of the underlying type if the type is an opaque.

Note that if this is an associated type, this is not the DefId of the TraitRef containing this associated type, which is in tcx.associated_item(def_id).container, aka. tcx.parent(def_id).

§_use_alias_ty_new_instead: ()

This field exists to prevent the creation of AliasTy without using AliasTy::new.

Implementations§

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impl<'tcx> AliasTy<'tcx>

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pub fn new( tcx: TyCtxt<'tcx>, def_id: DefId, args: impl IntoIterator<Item: Into<GenericArg<'tcx>>> ) -> AliasTy<'tcx>

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pub fn kind(self, tcx: TyCtxt<'tcx>) -> AliasKind

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pub fn is_opaque(self, tcx: TyCtxt<'tcx>) -> bool

Whether this alias type is an opaque.

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pub fn opt_kind(self, tcx: TyCtxt<'tcx>) -> Option<AliasKind>

FIXME: rename AliasTy to AliasTerm and always handle constants. This function can then be removed.

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pub fn to_ty(self, tcx: TyCtxt<'tcx>) -> Ty<'tcx>

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impl<'tcx> AliasTy<'tcx>

The following methods work only with associated type projections.

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pub fn self_ty(self) -> Ty<'tcx>

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pub fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> Self

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impl<'tcx> AliasTy<'tcx>

The following methods work only with trait associated type projections.

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pub fn trait_def_id(self, tcx: TyCtxt<'tcx>) -> DefId

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pub fn trait_ref_and_own_args( self, tcx: TyCtxt<'tcx> ) -> (TraitRef<'tcx>, &'tcx [GenericArg<'tcx>])

Extracts the underlying trait reference and own args from this projection. For example, if this is a projection of <T as StreamingIterator>::Item<'a>, then this function would return a T: StreamingIterator trait reference and ['a] as the own args

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pub fn trait_ref(self, tcx: TyCtxt<'tcx>) -> TraitRef<'tcx>

Extracts the underlying trait reference from this projection. For example, if this is a projection of <T as Iterator>::Item, then this function would return a T: Iterator trait reference.

WARNING: This will drop the args for generic associated types consider calling Self::trait_ref_and_own_args to get those as well.

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impl<'tcx> AliasTy<'tcx>

The following methods work only with inherent associated type projections.

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pub fn rebase_inherent_args_onto_impl( self, impl_args: GenericArgsRef<'tcx>, tcx: TyCtxt<'tcx> ) -> GenericArgsRef<'tcx>

Transform the substitutions to have the given impl args as the base and the GAT args on top of that.

Does the following transformation:

[Self, P_0...P_m] -> [I_0...I_n, P_0...P_m]

    I_i impl subst
    P_j GAT subst

Trait Implementations§

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impl<'tcx> Clone for AliasTy<'tcx>

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

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'tcx> Debug for AliasTy<'tcx>

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

Formats the value using the given formatter. Read more
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impl<'tcx> DebugWithInfcx<TyCtxt<'tcx>> for AliasTy<'tcx>

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fn fmt<Infcx: InferCtxtLike<Interner = TyCtxt<'tcx>>>( this: WithInfcx<'_, Infcx, &Self>, f: &mut Formatter<'_> ) -> Result

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

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

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impl<'tcx> Display for AliasTy<'tcx>

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

Formats the value using the given formatter. Read more
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impl<'tcx, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for AliasTy<'tcx>

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

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impl<'tcx> EraseType for AliasTy<'tcx>

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type Result = [u8; 16]

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impl<'tcx> Hash for AliasTy<'tcx>

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for AliasTy<'tcx>

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

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impl<'tcx, '__lifted> Lift<'__lifted> for AliasTy<'tcx>

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type Lifted = AliasTy<'__lifted>

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fn lift_to_tcx(self, __tcx: TyCtxt<'__lifted>) -> Option<AliasTy<'__lifted>>

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impl<'tcx> Ord for AliasTy<'tcx>

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fn cmp(&self, other: &AliasTy<'tcx>) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl<'tcx> PartialEq for AliasTy<'tcx>

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fn eq(&self, other: &AliasTy<'tcx>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<'tcx> PartialOrd for AliasTy<'tcx>

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fn partial_cmp(&self, other: &AliasTy<'tcx>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<'tcx, P: PrettyPrinter<'tcx>> Print<'tcx, P> for AliasTy<'tcx>

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impl<'tcx> Relate<'tcx> for AliasTy<'tcx>

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fn relate<R: TypeRelation<'tcx>>( relation: &mut R, a: AliasTy<'tcx>, b: AliasTy<'tcx> ) -> RelateResult<'tcx, AliasTy<'tcx>>

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impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for AliasTy<'tcx>

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fn try_fold_with<__F: FallibleTypeFolder<TyCtxt<'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). Read more
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fn fold_with<F>(self, folder: &mut F) -> Self
where F: TypeFolder<I>,

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.
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impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for AliasTy<'tcx>

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fn visit_with<__V: TypeVisitor<TyCtxt<'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). Read more
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impl<'tcx> Copy for AliasTy<'tcx>

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impl<'tcx> Eq for AliasTy<'tcx>

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impl<'tcx> StructuralPartialEq for AliasTy<'tcx>

Auto Trait Implementations§

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impl<'tcx> !RefUnwindSafe for AliasTy<'tcx>

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impl<'tcx> Send for AliasTy<'tcx>

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impl<'tcx> Sync for AliasTy<'tcx>

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impl<'tcx> Unpin for AliasTy<'tcx>

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impl<'tcx> !UnwindSafe for AliasTy<'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<'tcx, T> ArenaAllocatable<'tcx, IsCopy> for T
where T: Copy,

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fn allocate_on<'a>(self, arena: &'a Arena<'tcx>) -> &'a mut T

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fn allocate_from_iter<'a>( arena: &'a Arena<'tcx>, iter: impl IntoIterator<Item = T> ) -> &'a mut [T]

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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<Tcx, T> DepNodeParams<Tcx> for T
where Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

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default fn fingerprint_style() -> FingerprintStyle

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default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
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default fn to_debug_str(&self, _: Tcx) -> String

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default fn recover(_: Tcx, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes during red-green evaluation. The query system will only call this method if fingerprint_style() is not FingerprintStyle::Opaque. It is always valid to return None here, in which case incremental compilation will treat the query as having changed instead of forcing it.
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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, 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<P> IntoQueryParam<P> for P

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impl<'tcx, T> IsSuggestable<'tcx> for T
where T: TypeVisitable<TyCtxt<'tcx>> + TypeFoldable<TyCtxt<'tcx>>,

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fn is_suggestable(self, tcx: TyCtxt<'tcx>, infer_suggestable: bool) -> bool

Whether this makes sense to suggest in a diagnostic. Read more
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fn make_suggestable( self, tcx: TyCtxt<'tcx>, infer_suggestable: bool ) -> Option<T>

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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> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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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<'tcx, T> TypeVisitableExt<'tcx> for T
where T: TypeVisitable<TyCtxt<'tcx>>,

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

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fn has_projections(&self) -> bool

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fn has_inherent_projections(&self) -> bool

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fn has_opaque_types(&self) -> bool

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fn has_coroutines(&self) -> bool

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fn references_error(&self) -> bool

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

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fn has_non_region_param(&self) -> bool

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fn has_infer_regions(&self) -> bool

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fn has_infer_types(&self) -> bool

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fn has_non_region_infer(&self) -> bool

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fn has_infer(&self) -> bool

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fn has_placeholders(&self) -> bool

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fn has_non_region_placeholders(&self) -> bool

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fn has_param(&self) -> bool

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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.
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fn has_erased_regions(&self) -> bool

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fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.
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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.
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fn has_bound_regions(&self) -> bool

True if there are any late-bound regions
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fn has_non_region_bound_vars(&self) -> bool

True if there are any late-bound non-region variables
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fn has_bound_vars(&self) -> bool

True if there are any bound variables
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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.
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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

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