Struct VMClosure 

pub struct VMClosure {
    pub chunk: Rc<Chunk>,
    pub upvalues: Vec<NanBox>,
    pub arity: u16,
    pub name: Option<String>,
    pub formals: Vec<(String, bool)>,
}

A compiled closure: the function’s bytecode chunk plus captured values.

Fields

chunk: Rc<Chunk>

The function’s compiled bytecode.

upvalues: Vec<NanBox>

Captured upvalues (values from enclosing scopes).

Stored as NanBox (the runtime frame representation) so that closure capture and invocation are Rc-refcount clones, not deep VMValue<->NanBox round-trips. The runtime CallFrame already holds Vec<NanBox>.

arity: u16

Number of parameters this closure expects (1 for Nix lambdas, but pattern-match destructuring may set multiple locals).

name: Option<String>

Name hint for error messages (e.g., the parameter name).

formals: Vec<(String, bool)>

Formal parameter names and whether they have defaults. Populated for pattern-destructuring lambdas ({ a, b ? 1 }: ...). Empty for simple ident-param lambdas (x: ...). Used by builtins.functionArgs.

Trait Implementations

impl Clone for VMClosure

fn clone(&self) -> VMClosure

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VMClosure

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

Formats the value using the given formatter.