function f/0
  <dead compose> "a" "e" : "æ"
end function

# (function (@ 1 0-8) ‘f/0’
#   (.inner
#     (map (@ 2 2-2)
#       (.sequence
#         (keys (@ 2 2-16) ‘<dead compose>’)
#         (string (@ 2 17-20) ‘"a"’)
#         (string (@ 2 21-24) ‘"e"’)
#       )
#       (.result
#         (string (@ 2 27-31) ‘"æ"’)
#       )
#     )
#   )
# )
# :2:2–30: error: mapping-statement inside function definition
#    <dead compose> "a" "e" : "æ"
#    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
#