Enum rustc_trait_selection::infer::canonical::CanonicalTyVarKind

pub enum CanonicalTyVarKind {
    General(UniverseIndex),
    Int,
    Float,
}

Rust actually has more than one category of type variables; notably, the type variables we create for literals (e.g., 22 or 22.) can only be instantiated with integral/float types (e.g., usize or f32). In order to faithfully reproduce a type, we need to know what set of types a given type variable can be unified with.

Variants

General(UniverseIndex)

General type variable ?T that can be unified with arbitrary types.

Int

Integral type variable ?I (that can only be unified with integral types).

Float

Floating-point type variable ?F (that can only be unified with float types).

Trait Implementations

impl Clone for CanonicalTyVarKind

fn clone(&self) -> CanonicalTyVarKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for CanonicalTyVarKind

impl Debug for CanonicalTyVarKind

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

Formats the value using the given formatter.

impl Eq for CanonicalTyVarKind

impl Hash for CanonicalTyVarKind

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

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 PartialEq<CanonicalTyVarKind> for CanonicalTyVarKind

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

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

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

This method tests for !=.