Enum Expr

pub enum Expr {
    Term(TypeId, TermId, Vec<Expr>),
    Var(TypeId, VarId),
    ConstBool(TypeId, bool),
    ConstInt(TypeId, i128),
    ConstPrim(TypeId, Sym),
    Let {
        ty: TypeId,
        bindings: Vec<(VarId, TypeId, Box<Expr>)>,
        body: Box<Expr>,
    },
}

A right-hand side expression of some rule.

Variants

Term(TypeId, TermId, Vec<Expr>)

Invoke this term constructor with the given arguments.

Var(TypeId, VarId)

Get the value of a variable that was bound in the left-hand side.

ConstBool(TypeId, bool)

Get a constant boolean.

ConstInt(TypeId, i128)

Get a constant integer.

ConstPrim(TypeId, Sym)

Get a constant primitive.

Let

Evaluate the nested expressions and bind their results to the given variables, then evaluate the body expression.

Fields

ty: TypeId

The type of the result of this let expression.

bindings: Vec<(VarId, TypeId, Box<Expr>)>

The expressions that are evaluated and bound to the given variables.

body: Box<Expr>

The body expression that is evaluated after the bindings.

Implementations

impl Expr

pub fn ty(&self) -> TypeId

Get this expression’s type.

pub fn visit<V: ExprVisitor>( &self, visitor: &mut V, termenv: &TermEnv, vars: &HashMap<VarId, V::ExprId>, ) -> V::ExprId

Recursively visit every subexpression.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.

impl PartialEq for Expr

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

impl StructuralPartialEq for Expr