Enum StackType 

pub enum StackType {
    Empty,
    Cons {
        rest: Box<StackType>,
        top: Type,
    },
    RowVar(String),
}

Stack types with row polymorphism

Variants

Empty

Empty stack

Cons

Stack with a value on top of rest Example: Int on top of ..a

Fields

rest: Box<StackType>

The rest of the stack (may be Empty, another Cons, or RowVar)

top: Type

The type on top of the stack

RowVar(String)

Row variable representing “rest of stack” Example: ..a in ( ..a Int – ..a Bool )

Implementations

impl StackType

pub fn empty() -> Self

Create an empty stack type

pub fn singleton(ty: Type) -> Self

Create a stack type with a single value

pub fn push(self, ty: Type) -> Self

Push a type onto a stack type

pub fn from_vec(types: Vec<Type>) -> Self

Create a stack type from a vector of types (bottom to top)

pub fn pop(self) -> Option<(StackType, Type)>

Pop a type from a stack type, returning (rest, top) if successful

Trait Implementations

impl Clone for StackType

fn clone(&self) -> StackType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StackType

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

Formats the value using the given formatter.

impl Display for StackType

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

Formats the value using the given formatter.

impl Hash for StackType

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 PartialEq for StackType

fn eq(&self, other: &StackType) -> 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 Eq for StackType

impl StructuralPartialEq for StackType