Enum HeadForm 

pub enum HeadForm {
    BVar(u32),
    FVar,
    Const(Name),
    Sort,
    Lambda,
    Pi,
    Lit,
    Let,
    Proj,
    BetaRedex,
}

The head form of an expression.

Variants

BVar(u32)

Expression headed by a bound variable.

FVar

Expression headed by a free variable.

Const(Name)

Expression headed by a constant.

Sort

Expression headed by a sort.

Lambda

Expression is a lambda abstraction.

Pi

Expression is a Pi type.

Lit

Expression is a literal.

Let

Expression is a let binding (reducible).

Proj

Expression is a projection.

BetaRedex

Expression is a beta-redex (reducible).

Implementations

impl HeadForm

pub fn is_reducible(&self) -> bool

Returns true if this head form indicates the expression is reducible.

pub fn is_variable(&self) -> bool

Returns true if this is a variable head.

pub fn is_neutral(&self) -> bool

Returns true if this is a canonical/neutral form.

Trait Implementations

impl Clone for HeadForm

fn clone(&self) -> HeadForm

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HeadForm

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

Formats the value using the given formatter.

impl PartialEq for HeadForm

fn eq(&self, other: &HeadForm) -> 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 HeadForm

impl StructuralPartialEq for HeadForm