[
(let)
(binding)
(simple_fun)
(def)
(arglist)
(if)
(if_condition)
(if_then)
(elsif_condition)
(elsif_then)
(if_else)
(for)
(for_do)
(while)
(while_do)
(try)
(try_body)
(try_do)
(block)
] @fold
