function f/0
  information
  end information
end function

# (function (@ 1 0-8) ‘f/0’
#   (.inner
#     (information (@ 2 2-13)
#       (.inner nil)
#     )
#   )
# )
# :2:2–13: error: information clause inside function definition
#    information
#    ^^^^^^^^^^^
# :1:0–8: note: outer function definition defined here
#  function f/0
#  ^^^^^^^^