pub fn eval_const_node<'a>(
engine: TrackedMut<'_, Engine<'_>>,
node: ExpressionNode,
instance: Option<NodeInstance>,
) -> Option<Value>pub fn eval_const_node<'a>(
engine: TrackedMut<'_, Engine<'_>>,
node: ExpressionNode,
instance: Option<NodeInstance>,
) -> Option<Value>