Struct rustc_middle::ty::subst::EarlyBinder

pub struct EarlyBinder<T>(pub T);

Similar to super::Binder except that it tracks early bound generics, i.e. struct Foo<T>(T) needs T substituted immediately. This type primarily exists to avoid forgetting to call subst.

If you don’t have anything to subst, you may be looking for subst_identity or skip_binder.

Tuple Fields

0: T

Implementations

impl<T> EarlyBinder<T>

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

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

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

pub fn try_map_bound<F, U, E>(self, f: F) -> Result<EarlyBinder<U>, E>where F: FnOnce(T) -> Result<U, E>,

pub fn rebind<U>(&self, value: U) -> EarlyBinder<U>

pub fn skip_binder(self) -> T

Skips the binder and returns the “bound” value. This can be used to extract data that does not depend on generic parameters (e.g., getting the DefId of the inner value or getting the number of arguments of an FnSig). Otherwise, consider using subst_identity.

See also Binder::skip_binder, which is the analogous operation on super::Binder.

impl<T> EarlyBinder<Option<T>>

pub fn transpose(self) -> Option<EarlyBinder<T>>

impl<T, U> EarlyBinder<(T, U)>

pub fn transpose_tuple2(self) -> (EarlyBinder<T>, EarlyBinder<U>)

impl<'tcx, 's, I: IntoIterator> EarlyBinder<I>where I::Item: TypeFoldable<TyCtxt<'tcx>>,

pub fn subst_iter( self, tcx: TyCtxt<'tcx>, substs: &'s [GenericArg<'tcx>] ) -> SubstIter<'s, 'tcx, I>

impl<'tcx, 's, I: IntoIterator> EarlyBinder<I>where I::Item: Deref, <<I as IntoIterator>::Item as Deref>::Target: Copy + TypeFoldable<TyCtxt<'tcx>>,

pub fn subst_iter_copied( self, tcx: TyCtxt<'tcx>, substs: &'s [GenericArg<'tcx>] ) -> SubstIterCopied<'s, 'tcx, I>

impl<T: IntoIterator> EarlyBinder<T>

pub fn transpose_iter(self) -> EarlyBinderIter<T::IntoIter>

impl<'tcx, T: TypeFoldable<TyCtxt<'tcx>>> EarlyBinder<T>

pub fn subst(self, tcx: TyCtxt<'tcx>, substs: &[GenericArg<'tcx>]) -> T

pub fn subst_identity(self) -> T

Makes the identity substitution T0 => T0, ..., TN => TN. Conceptually, this converts universally bound variables into placeholders when inside of a given item.

For example, consider for<T> fn foo<T>(){ .. }:

• Outside of foo, T is bound (represented by the presence of EarlyBinder).
• Inside of the body of foo, we treat T as a placeholder by calling subst_identity to discharge the EarlyBinder.

pub fn no_bound_vars(self) -> Option<T>

Returns the inner value, but only if it contains no bound vars.

Trait Implementations

impl<T: Clone> Clone for EarlyBinder<T>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for EarlyBinder<T>

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

Formats the value using the given formatter.

impl<T, __D: Decoder> Decodable<__D> for EarlyBinder<T>where T: Decodable<__D>,

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

impl<T, __E: Encoder> Encodable<__E> for EarlyBinder<T>where T: Encodable<__E>,

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

impl<T: Hash> Hash for EarlyBinder<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, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'__ctx, T> HashStable<StableHashingContext<'__ctx>> for EarlyBinder<T>where T: HashStable<StableHashingContext<'__ctx>>,

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

impl<T: Ord> Ord for EarlyBinder<T>

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

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl<T: ParameterizedOverTcx> ParameterizedOverTcx for EarlyBinder<T>

type Value<'tcx> = EarlyBinder<<T as ParameterizedOverTcx>::Value<'tcx>>

impl<T: PartialEq> PartialEq<EarlyBinder<T>> for EarlyBinder<T>

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

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

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.

impl<T: PartialOrd> PartialOrd<EarlyBinder<T>> for EarlyBinder<T>

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

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

fn lt(&self, other: &Rhs) -> bool

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

fn le(&self, other: &Rhs) -> bool

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

fn gt(&self, other: &Rhs) -> bool

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

fn ge(&self, other: &Rhs) -> bool

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

impl<'tcx, T> !TypeFoldable<TyCtxt<'tcx>> for EarlyBinder<T>

For early binders, you should first call subst before using any visitors.

fn try_fold_with<F>( self, folder: &mut F ) -> Result<Self, <F as FallibleTypeFolder<I>>::Error>where F: FallibleTypeFolder<I>,

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

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.

impl<'tcx, T> !TypeVisitable<TyCtxt<'tcx>> for EarlyBinder<T>

fn visit_with<V>( &self, visitor: &mut V ) -> ControlFlow<<V as TypeVisitor<I>>::BreakTy, ()>where V: TypeVisitor<I>,

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

impl<'tcx> Value<TyCtxt<'tcx>, DepKind> for EarlyBinder<Binder<'_, FnSig<'_>>>

fn from_cycle_error(tcx: TyCtxt<'tcx>, cycle: &[QueryInfo<DepKind>]) -> Self

impl<'tcx> Value<TyCtxt<'tcx>, DepKind> for EarlyBinder<Ty<'_>>

fn from_cycle_error(tcx: TyCtxt<'tcx>, cycle: &[QueryInfo<DepKind>]) -> Self

impl<T: Copy> Copy for EarlyBinder<T>

impl<T: Eq> Eq for EarlyBinder<T>

impl<T> StructuralEq for EarlyBinder<T>

impl<T> StructuralPartialEq for EarlyBinder<T>

Layout

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