Enum 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

fn clone(&self) -> InferTy

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for InferTy

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

Formats the value using the given formatter.

impl<__D: SpanDecoder> Decodable<__D> for InferTy

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

impl Display for InferTy

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

Formats the value using the given formatter.

impl<__E: SpanEncoder> Encodable<__E> for InferTy

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

impl Hash for InferTy

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> HashStable<CTX> for InferTy

fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher)

impl Ord for InferTy

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

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

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

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for InferTy

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for InferTy

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl<I: Interner> TypeFoldable<I> for InferTy

fn try_fold_with<F: FallibleTypeFolder<I>>( self, _: &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).

fn fold_with<F: TypeFolder<I>>(self, _: &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.

impl<I: Interner> TypeVisitable<I> for InferTy

fn visit_with<F: TypeVisitor<I>>(&self, _: &mut F) -> F::Result

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

impl Copy for InferTy

impl Eq for InferTy

impl StructuralPartialEq for InferTy

Layout

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: 8 bytes

Size for each variant:

• TyVar: 4 bytes
• IntVar: 4 bytes
• FloatVar: 4 bytes
• FreshTy: 4 bytes
• FreshIntTy: 4 bytes
• FreshFloatTy: 4 bytes