1 . . 2 : 3

# (map (@ 1 0-0)
#   (.sequence
#     (string (@ 1 0-1) ‘1’)
#     (string (@ 1 6-7) ‘2’)
#   )
#   (.result
#     (string (@ 1 10-11) ‘3’)
#   )
# )
# nothing_in_map:1:2–3: warning: ‘.’ outside alternation has no effect
#  1 . . 2 : 3
#    ^
# nothing_in_map:1:4–5: warning: ‘.’ outside alternation has no effect
#  1 . . 2 : 3
#      ^