Struct rustc_middle::ty::TraitRef

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pub struct TraitRef<'tcx> {
    pub def_id: DefId,
    pub args: GenericArgsRef<'tcx>,
    pub(super) _use_trait_ref_new_instead: (),
}
Expand description

A complete reference to a trait. These take numerous guises in syntax, but perhaps the most recognizable form is in a where-clause:

T: Foo<U>

This would be represented by a trait-reference where the DefId is the DefId for the trait Foo and the args define T as parameter 0, and U as parameter 1.

Trait references also appear in object types like Foo<U>, but in that case the Self parameter is absent from the substitutions.

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§def_id: DefId§args: GenericArgsRef<'tcx>§_use_trait_ref_new_instead: ()

This field exists to prevent the creation of TraitRef without calling TraitRef::new.

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impl<'tcx> TraitRef<'tcx>

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impl<'tcx> TraitRef<'tcx>

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

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pub fn from_lang_item( tcx: TyCtxt<'tcx>, trait_lang_item: LangItem, span: Span, args: impl IntoIterator<Item: Into<GenericArg<'tcx>>> ) -> Self

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pub fn from_method( tcx: TyCtxt<'tcx>, trait_id: DefId, args: GenericArgsRef<'tcx> ) -> TraitRef<'tcx>

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pub fn identity(tcx: TyCtxt<'tcx>, def_id: DefId) -> TraitRef<'tcx>

Returns a TraitRef of the form P0: Foo<P1..Pn> where Pi are the parameters defined on trait.

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

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

Trait Implementations§

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impl<'tcx> Clone for TraitRef<'tcx>

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fn clone(&self) -> TraitRef<'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 TraitRef<'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, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for TraitRef<'tcx>

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

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impl<'tcx> Display for TraitRef<'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 TraitRef<'tcx>

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

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impl<'tcx> EraseType for TraitRef<'tcx>

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type Result = [u8; 16]

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impl<'tcx> Hash for TraitRef<'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 TraitRef<'tcx>

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

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impl<'tcx> IntoDiagnosticArg for TraitRef<'tcx>

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

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type Lifted = TraitRef<'__lifted>

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

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impl<'tcx> Ord for TraitRef<'tcx>

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

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

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

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

Restrict a value to a certain interval. Read more
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impl ParameterizedOverTcx for TraitRef<'static>

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type Value<'tcx> = TraitRef<'tcx>

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impl<'tcx> PartialEq<TraitRef<'tcx>> for TraitRef<'tcx>

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fn eq(&self, other: &TraitRef<'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<TraitRef<'tcx>> for TraitRef<'tcx>

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fn partial_cmp(&self, other: &TraitRef<'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 TraitRef<'tcx>

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type Output = P

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type Error = Error

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fn print(&self, cx: P) -> Result<Self::Output, Self::Error>

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impl<'tcx> Relate<'tcx> for TraitRef<'tcx>

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

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impl<'tcx> ToPredicate<'tcx, Clause<'tcx>> for TraitRef<'tcx>

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fn to_predicate(self, tcx: TyCtxt<'tcx>) -> Clause<'tcx>

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impl<'tcx> ToPredicate<'tcx, Predicate<'tcx>> for TraitRef<'tcx>

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fn to_predicate(self, tcx: TyCtxt<'tcx>) -> Predicate<'tcx>

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impl<'tcx> ToPredicate<'tcx, TraitPredicate<'tcx>> for TraitRef<'tcx>

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> TraitPredicate<'tcx>

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impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for TraitRef<'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) -> Selfwhere 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 TraitRef<'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 TraitRef<'tcx>

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impl<'tcx> Eq for TraitRef<'tcx>

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impl<'tcx> StructuralEq for TraitRef<'tcx>

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impl<'tcx> StructuralPartialEq for TraitRef<'tcx>

Auto Trait Implementations§

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

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impl<'tcx> Send for TraitRef<'tcx>

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impl<'tcx> Sync for TraitRef<'tcx>

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impl<'tcx> Unpin for TraitRef<'tcx>

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impl<'tcx> !UnwindSafe for TraitRef<'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 Twhere 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 Twhere 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 Twhere 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 Twhere 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) -> Rwhere 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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_generators(&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_late_bound_regions(&self) -> bool

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

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

True if there are any late-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 Twhere Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle: &[QueryInfo], _guar: ErrorGuaranteed ) -> T

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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