Struct rustc_type_ir::ty_kind::AliasTy

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pub struct AliasTy<I: Interner> {
    pub args: I::GenericArgs,
    pub def_id: I::DefId,
    pub(crate) _use_alias_ty_new_instead: (),
}
Expand description

Represents the projection of an associated, opaque, or lazy-type-alias 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: I::GenericArgs

The parameters of the associated or opaque type.

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

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

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

§def_id: I::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, interner.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 interner.associated_item(def_id).container, aka. interner.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<I: Interner> AliasTy<I>

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pub fn new( interner: I, def_id: I::DefId, args: impl IntoIterator<Item: Into<I::GenericArg>>, ) -> AliasTy<I>

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pub fn kind(self, interner: I) -> AliasTyKind

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pub fn is_opaque(self, interner: I) -> bool

Whether this alias type is an opaque.

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pub fn to_ty(self, interner: I) -> I::Ty

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impl<I: Interner> AliasTy<I>

The following methods work only with (trait) associated type projections.

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pub fn self_ty(self) -> I::Ty

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pub fn with_self_ty(self, interner: I, self_ty: I::Ty) -> Self

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pub fn trait_def_id(self, interner: I) -> I::DefId

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pub fn trait_ref_and_own_args( self, interner: I, ) -> (TraitRef<I>, I::GenericArgsSlice)

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, interner: I) -> TraitRef<I>

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<I: Interner> AliasTy<I>

The following methods work only with inherent associated type projections.

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pub fn rebase_inherent_args_onto_impl( self, impl_args: I::GenericArgs, interner: I, ) -> I::GenericArgs

Transform the generic parameters 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 args
    P_j GAT args

Trait Implementations§

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impl<I: Interner> Clone for AliasTy<I>

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fn clone(&self) -> Self

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<I: Interner> Debug for AliasTy<I>

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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<I: Interner, __D: TyDecoder<I = I>> Decodable<__D> for AliasTy<I>
where I::GenericArgs: Decodable<__D>, I::DefId: Decodable<__D>,

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

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impl<I: Interner> Display for AliasTy<I>

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

Formats the value using the given formatter. Read more
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impl<I: Interner, __E: TyEncoder<I = I>> Encodable<__E> for AliasTy<I>
where I::GenericArgs: Encodable<__E>, I::DefId: Encodable<__E>,

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

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impl<I: Interner> From<AliasTy<I>> for AliasTerm<I>

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fn from(ty: AliasTy<I>) -> Self

Converts to this type from the input type.
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impl<I: Interner> Hash for AliasTy<I>

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fn hash<__HI>(&self, __state: &mut __HI)
where __HI: Hasher,

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<I: Interner, __CTX> HashStable<__CTX> for AliasTy<I>
where I::GenericArgs: HashStable<__CTX>, I::DefId: HashStable<__CTX>,

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fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

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impl<I, J> Lift<J> for AliasTy<I>
where I: Interner, J: Interner, I::GenericArgs: Lift<J, Lifted = J::GenericArgs>, I::DefId: Lift<J, Lifted = J::DefId>, (): Lift<J, Lifted = ()>,

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type Lifted = AliasTy<J>

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fn lift_to_tcx(self, interner: J) -> Option<Self::Lifted>

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impl<I: Interner> PartialEq for AliasTy<I>

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fn eq(&self, other: &Self) -> 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<I: Interner> Relate<I> for AliasTy<I>

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

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impl<I> TypeFoldable<I> for AliasTy<I>

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fn try_fold_with<__F: FallibleTypeFolder<I>>( 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: TypeFolder<I>>(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.
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impl<I> TypeVisitable<I> for AliasTy<I>

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fn visit_with<__V: TypeVisitor<I>>(&self, __visitor: &mut __V) -> __V::Result

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<I: Interner> Copy for AliasTy<I>

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impl<I: Interner> Eq for AliasTy<I>

Auto Trait Implementations§

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impl<I> DynSend for AliasTy<I>
where <I as Interner>::GenericArgs: DynSend, <I as Interner>::DefId: DynSend,

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impl<I> DynSync for AliasTy<I>
where <I as Interner>::GenericArgs: DynSync, <I as Interner>::DefId: DynSync,

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impl<I> Freeze for AliasTy<I>
where <I as Interner>::GenericArgs: Freeze, <I as Interner>::DefId: Freeze,

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impl<I> RefUnwindSafe for AliasTy<I>

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impl<I> Send for AliasTy<I>
where <I as Interner>::GenericArgs: Send, <I as Interner>::DefId: Send,

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impl<I> Sync for AliasTy<I>
where <I as Interner>::GenericArgs: Sync, <I as Interner>::DefId: Sync,

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impl<I> Unpin for AliasTy<I>
where <I as Interner>::GenericArgs: Unpin, <I as Interner>::DefId: Unpin,

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impl<I> UnwindSafe for AliasTy<I>

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<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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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<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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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> 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<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<I, T> TypeVisitableExt<I> for T
where I: Interner, T: TypeVisitable<I>,

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

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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 error_reported(&self) -> Result<(), <I as Interner>::ErrorGuaranteed>

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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_aliases(&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 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<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<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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Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.