Enum PromiseState 

pub enum PromiseState {
    Pending(Arc<Closure>),
    Forced(Value),
}

State of a Value::Promise. Created Pending wrapping a thunk (always a unary closure of zero args); on first force, the thunk runs and the result replaces the state with Forced(value). All subsequent forces return the cached value without re-evaluation.

Variants

Pending(Arc<Closure>)

Forced(Value)

Trait Implementations

impl Debug for PromiseState

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

Formats the value using the given formatter.