Struct rustc::ty::Binder

pub struct Binder<T>(T);

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Binder is a binder for higher-ranked lifetimes or types. It is part of the compiler's representation for things like for<'a> Fn(&'a isize) (which would be represented by the type PolyTraitRef == Binder<TraitRef>). Note that when we instantiate, erase, or otherwise "discharge" these bound vars, we change the type from Binder<T> to just T (see e.g., liberate_late_bound_regions).

Methods

impl<'tcx> Binder<TraitRef<'tcx>>

pub fn print_only_trait_path(self) -> Binder<TraitRefPrintOnlyTraitPath<'tcx>>

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

impl<'tcx> Binder<ExistentialPredicate<'tcx>>

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

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

impl<'tcx> Binder<&'tcx List<ExistentialPredicate<'tcx>>>

pub fn principal(&self) -> Option<Binder<ExistentialTraitRef<'tcx>>>

⚙️ This is an internal compiler API. (rustc_private)

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pub fn principal_def_id(&self) -> Option<DefId>

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pub fn projection_bounds<'a>(
    &'a self
) -> impl Iterator<Item = PolyExistentialProjection<'tcx>> + 'a

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pub fn auto_traits<'a>(&'a self) -> impl Iterator<Item = DefId> + 'a

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pub fn iter<'a>(
    &'a self
) -> impl DoubleEndedIterator<Item = Binder<ExistentialPredicate<'tcx>>> + 'tcx

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impl<'tcx> Binder<TraitRef<'tcx>>

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

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pub fn def_id(&self) -> DefId

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pub fn to_poly_trait_predicate(&self) -> PolyTraitPredicate<'tcx>

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impl<'tcx> Binder<ExistentialTraitRef<'tcx>>

pub fn def_id(&self) -> DefId

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

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Object types don't have a self type specified. Therefore, when we convert the principal trait-ref into a normal trait-ref, you must give some self type. A common choice is mk_err() or some placeholder type.

impl<T> Binder<T>

pub fn dummy<'tcx>(value: T) -> Binder<T> where
    T: TypeFoldable<'tcx>, 

⚙️ This is an internal compiler API. (rustc_private)

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Wraps value in a binder, asserting that value does not contain any bound vars that would be bound by the binder. This is commonly used to 'inject' a value T into a different binding level.

pub fn bind(value: T) -> Binder<T>

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Wraps value in a binder, binding higher-ranked vars (if any).

pub fn skip_binder(&self) -> &T

⚙️ This is an internal compiler API. (rustc_private)

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Skips the binder and returns the "bound" value. This is a risky thing to do because it's easy to get confused about De Bruijn indices and the like. It is usually better to discharge the binder using no_bound_vars or replace_late_bound_regions or something like that. skip_binder is only valid when you are either extracting data that has nothing to do with bound vars, you are doing some sort of test that does not involve bound regions, or you are being very careful about your depth accounting.

Some examples where skip_binder is reasonable:

• extracting the DefId from a PolyTraitRef;
• comparing the self type of a PolyTraitRef to see if it is equal to a type parameter X, since the type X does not reference any regions

pub fn as_ref(&self) -> Binder<&T>

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pub fn map_bound_ref<F, U>(&self, f: F) -> Binder<U> where
    F: FnOnce(&T) -> U, 

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pub fn map_bound<F, U>(self, f: F) -> Binder<U> where
    F: FnOnce(T) -> U, 

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pub fn no_bound_vars<'tcx>(self) -> Option<T> where
    T: TypeFoldable<'tcx>, 

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Unwraps and returns the value within, but only if it contains no bound vars at all. (In other words, if this binder -- and indeed any enclosing binder -- doesn't bind anything at all.) Otherwise, returns None.

(One could imagine having a method that just unwraps a single binder, but permits late-bound vars bound by enclosing binders, but that would require adjusting the debruijn indices, and given the shallow binding structure we often use, would not be that useful.)

pub fn fuse<U, F, R>(self, u: Binder<U>, f: F) -> Binder<R> where
    F: FnOnce(T, U) -> R, 

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Given two things that have the same binder level, and an operation that wraps on their contents, executes the operation and then wraps its result.

f should consider bound regions at depth 1 to be free, and anything it produces with bound regions at depth 1 will be bound in the resulting return value.

pub fn split<U, V, F>(self, f: F) -> (Binder<U>, Binder<V>) where
    F: FnOnce(T) -> (U, V), 

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

Splits the contents into two things that share the same binder level as the original, returning two distinct binders.

f should consider bound regions at depth 1 to be free, and anything it produces with bound regions at depth 1 will be bound in the resulting return values.

impl<'tcx> Binder<GenSig<'tcx>>

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

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

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impl<'tcx> Binder<FnSig<'tcx>>

pub fn inputs(&self) -> Binder<&'tcx [Ty<'tcx>]>

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pub fn input(&self, index: usize) -> Binder<Ty<'tcx>>

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pub fn inputs_and_output(&self) -> Binder<&'tcx List<Ty<'tcx>>>

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

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pub fn c_variadic(&self) -> bool

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pub fn unsafety(&self) -> Unsafety

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pub fn abi(&self) -> Abi

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impl<'tcx> Binder<ExistentialProjection<'tcx>>

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

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pub fn item_def_id(&self) -> DefId

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impl<'tcx> Binder<TraitPredicate<'tcx>>

pub fn def_id(&self) -> DefId

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

impl<'tcx> Binder<ProjectionPredicate<'tcx>>

pub fn item_def_id(&self) -> DefId

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Returns the DefId of the associated item being projected.

pub fn to_poly_trait_ref(&self, tcx: TyCtxt<'tcx>) -> PolyTraitRef<'tcx>

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This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

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

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pub fn projection_def_id(&self) -> DefId

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The DefId of the TraitItem for the associated type.

Note that this is not the DefId of the TraitRef containing this associated type, which is in tcx.associated_item(projection_def_id()).container.

Trait Implementations

impl<T: Clone> Clone for Binder<T>

fn clone(&self) -> Binder<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Copy> Copy for Binder<T>

impl<T: Debug> Debug for Binder<T>

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

Formats the value using the given formatter.

impl<T: Decodable> Decodable for Binder<T>

fn decode<__D: Decoder>(d: &mut __D) -> Result<Binder<T>, __D::Error>

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

impl<'tcx> Display for Binder<&'tcx List<ExistentialPredicate<'tcx>>>

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

Formats the value using the given formatter.

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

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

Formats the value using the given formatter.

impl<'tcx> Display for Binder<TraitRefPrintOnlyTraitPath<'tcx>>

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

Formats the value using the given formatter.

impl<'tcx> Display for Binder<FnSig<'tcx>>

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

Formats the value using the given formatter.

impl<'tcx> Display for Binder<TraitPredicate<'tcx>>

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

Formats the value using the given formatter.

impl<'tcx> Display for Binder<SubtypePredicate<'tcx>>

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

Formats the value using the given formatter.

impl<'tcx> Display for Binder<ProjectionPredicate<'tcx>>

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

Formats the value using the given formatter.

impl<'tcx> Display for Binder<OutlivesPredicate<Ty<'tcx>, Region<'tcx>>>

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

Formats the value using the given formatter.

impl<'tcx> Display for Binder<OutlivesPredicate<Region<'tcx>, Region<'tcx>>>

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

Formats the value using the given formatter.

impl<T: Encodable> Encodable for Binder<T>

fn encode<__S: Encoder>(&self, s: &mut __S) -> Result<(), __S::Error>

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impl<T: Eq> Eq for Binder<T>

impl<T: Hash> Hash for Binder<T>

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

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl<'a, T> HashStable<StableHashingContext<'a>> for Binder<T> where
    T: HashStable<StableHashingContext<'a>>, 

fn hash_stable(
    &self,
    hcx: &mut StableHashingContext<'a>,
    hasher: &mut StableHasher
)

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impl<'tcx, T: Lift<'tcx>> Lift<'tcx> for Binder<T>

type Lifted = Binder<T::Lifted>

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fn lift_to_tcx(&self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted>

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

impl<T: Ord> Ord for Binder<T>

fn cmp(&self, other: &Binder<T>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval.

impl<T: PartialEq> PartialEq<Binder<T>> for Binder<T>

fn eq(&self, other: &Binder<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Binder<T>) -> bool

This method tests for !=.

impl<T: PartialOrd> PartialOrd<Binder<T>> for Binder<T>

fn partial_cmp(&self, other: &Binder<T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Binder<T>) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Binder<T>) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Binder<T>) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Binder<T>) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'tcx, T, P: PrettyPrinter<'tcx>> Print<'tcx, P> for Binder<T> where
    T: Print<'tcx, P, Output = P, Error = P::Error> + TypeFoldable<'tcx>, 

type Output = P

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type Error = P::Error

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

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This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

impl<'tcx, T: Relate<'tcx>> Relate<'tcx> for Binder<T>

fn relate<R: TypeRelation<'tcx>>(
    relation: &mut R,
    a: &Binder<T>,
    b: &Binder<T>
) -> RelateResult<'tcx, Binder<T>>

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

impl<T> StructuralEq for Binder<T>

impl<T> StructuralPartialEq for Binder<T>

impl<'tcx, T: TypeFoldable<'tcx>> TypeFoldable<'tcx> for Binder<T>

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

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

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This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

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fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> bool

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

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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

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

fn has_escaping_bound_vars(&self) -> bool

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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 references_error(&self) -> bool

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fn has_param_types(&self) -> bool

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fn has_infer_types(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

fn has_infer_consts(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

fn has_local_value(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

fn needs_infer(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

fn has_placeholders(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

fn needs_subst(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

fn has_re_placeholders(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

fn has_closure_types(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

fn has_free_regions(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

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

fn has_erasable_regions(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

True if there are any un-erased free regions.

fn is_global(&self) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

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

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

True if there are any late-bound regions

fn visit_tys_shallow(&self, visit: impl FnMut(Ty<'tcx>) -> bool) -> bool

⚙️ This is an internal compiler API. (rustc_private)

This crate is being loaded from the sysroot, a permanently unstable location for private compiler dependencies. It is not intended for general use. Prefer using a public version of this crate from crates.io via Cargo.toml.

A visitor that does not recurse into types, works like fn walk_shallow in Ty.