Letlang basic structure of a block of code

letlang_block_skel.rs

let task_args: Vec<Value> = vec![];
let mut block = func.call(&mut context, task_args);

let ignored = Value::Boolean(bool::default());
let mut state = block.resume_with(ignored);

loop {
  match &state {
    GeneratorState::Yielded(FunctionInterruption::Effect { name, args }) => {
      // try to handle side effect

      if unknown_side_effect {
        // print debug information
        return Err(RuntimeError::EffectNotImplemented);
      }
      else {
        let effect_return_value = { /* ... */ };
        state = block.resume_with(effect_return_value);
      }
    },
    GeneratorState::Yielded(FunctionInterruption::Exception(exc)) => {
      // print exception
      return Err(RuntimeError::UncaughtException);
    },
    GeneratorState::Complete(val) => {
      // type check function's return value
      break;
    }
  }
}