Enum Expr

pub enum Expr {
    Call(Gc<Prim>, Vec<Gc<Prim>>),
    If(Gc<Prim>, Gc<Expr>, Gc<Expr>),
    Let(Option<Symbol>, Gc<Expr>, Gc<Expr>),
    Prim(Gc<Prim>),
}

A complex expression, i.e. one that can fail to normalize.

Variants

Call(Gc<Prim>, Vec<Gc<Prim>>)

A function call.

If(Gc<Prim>, Gc<Expr>, Gc<Expr>)

A conditional expression.

Let(Option<Symbol>, Gc<Expr>, Gc<Expr>)

A let binding.

Prim(Gc<Prim>)

A primitive expression.

Implementations

impl Expr

pub fn freevars(&self) -> BTreeSet<Symbol>

Returns the free variables of the expression.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a duplicate 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 Display for Expr

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

Formats the value using the given formatter.

impl Drop for Expr

fn drop(&mut self)

Executes the destructor for this type.

impl Finalize for Expr

fn finalize(&self)

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 Trace for Expr

unsafe fn trace(&self)

Marks all contained Gcs.

unsafe fn root(&self)

Increments the root-count of all contained Gcs.

unsafe fn unroot(&self)

Decrements the root-count of all contained Gcs.

fn finalize_glue(&self)

Runs Finalize::finalize() on this object and all contained subobjects

impl StructuralPartialEq for Expr