Enum rustc_middle::ty::InferTy

pub enum InferTy {
    TyVar(TyVid),
    IntVar(IntVid),
    FloatVar(FloatVid),
    FreshTy(u32),
    FreshIntTy(u32),
    FreshFloatTy(u32),
}

A placeholder for a type that hasn't been inferred yet.

E.g., if we have an empty array ([]), then we create a fresh type variable for the element type since we won't know until it's used what the element type is supposed to be.

Variants

TyVar(TyVid)

A type variable.

IntVar(IntVid)

An integral type variable ({integer}).

These are created when the compiler sees an integer literal like 1 that could be several different types (u8, i32, u32, etc.). We don't know until it's used what type it's supposed to be, so we create a fresh type variable.

FloatVar(FloatVid)

A floating-point type variable ({float}).

These are created when the compiler sees an float literal like 1.0 that could be either an f32 or an f64. We don't know until it's used what type it's supposed to be, so we create a fresh type variable.

FreshTy(u32)

A FreshTy is one that is generated as a replacement for an unbound type variable. This is convenient for caching etc. See rustc_infer::infer::freshen for more details.

Compare with TyVar.

FreshIntTy(u32)

Like FreshTy, but as a replacement for IntVar.

FreshFloatTy(u32)

Like FreshTy, but as a replacement for FloatVar.

Trait Implementations

impl Clone for InferTy

pub fn clone(&self) -> InferTy

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for InferTy

impl Debug for InferTy

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

Formats the value using the given formatter.

impl<'tcx, __D: TyDecoder<'tcx>> Decodable<__D> for InferTy

pub fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>

impl Display for InferTy

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

Formats the value using the given formatter.

impl<'tcx, __E: TyEncoder<'tcx>> Encodable<__E> for InferTy

pub fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>

impl Eq for InferTy

impl Hash for InferTy

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for InferTy

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

impl<'tcx> Lift<'tcx> for InferTy

type Lifted = Self

pub fn lift_to_tcx(self, _: TyCtxt<'tcx>) -> Option<Self>

impl Ord for InferTy

pub fn cmp(&self, other: &InferTy) -> Ordering

This method returns an Ordering between self and other.

#[must_use]pub fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]pub fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]pub fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<InferTy> for InferTy

pub fn eq(&self, other: &InferTy) -> bool

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

pub fn ne(&self, other: &InferTy) -> bool

This method tests for !=.

impl PartialOrd<InferTy> for InferTy

pub fn partial_cmp(&self, other: &InferTy) -> Option<Ordering>

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

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

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

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

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

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

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

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

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

impl<'tcx, P: PrettyPrinter<'tcx>> Print<'tcx, P> for InferTy

type Output = P

type Error = Error

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

impl StructuralEq for InferTy

impl StructuralPartialEq for InferTy

impl<'tcx> TypeFoldable<'tcx> for InferTy

pub fn super_fold_with<F: TypeFolder<'tcx>>(self, _: &mut F) -> InferTy

pub fn super_visit_with<F: TypeVisitor<'tcx>>(
    &self,
    _: &mut F
) -> ControlFlow<F::BreakTy>

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

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

pub 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.

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

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

pub fn has_escaping_bound_vars(&self) -> bool

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

pub fn has_projections(&self) -> bool

pub fn has_opaque_types(&self) -> bool

pub fn references_error(&self) -> bool

pub fn has_param_types_or_consts(&self) -> bool

pub fn has_infer_regions(&self) -> bool

pub fn has_infer_types(&self) -> bool

pub fn has_infer_types_or_consts(&self) -> bool

pub fn needs_infer(&self) -> bool

pub fn has_placeholders(&self) -> bool

pub fn needs_subst(&self) -> bool

pub 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.

pub fn has_erased_regions(&self) -> bool

pub fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.

pub 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.

pub fn has_late_bound_regions(&self) -> bool

True if there are any late-bound regions

pub 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.