Function try_dispatch_builtin 

pub fn try_dispatch_builtin(
    cyclers: &mut Vec<CyclerState>,
    joiners: &mut Vec<JoinerState>,
    is_defined: bool,
    binding: Option<&Value>,
    name: &str,
    arg_vals: &[Value],
) -> Option<Result<Value>>

Dispatches builtin function calls (range, cycler, joiner).