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 | my_macro([[1 2] [3 4]])
# (macro_call (@ 1 0-8) ‘my_macro/1’
#   (.arguments
#     (string (@ 1 11-12) ‘1’)
#   )
# )
# (macro_call (@ 1 0-8) ‘my_macro/1’
#   (.arguments
#     (string (@ 1 13-14) ‘2’)
#   )
# )
# (macro_call (@ 1 0-8) ‘my_macro/1’
#   (.arguments
#     (string (@ 1 17-18) ‘3’)
#   )
# )
# (macro_call (@ 1 0-8) ‘my_macro/1’
#   (.arguments
#     (string (@ 1 19-20) ‘4’)
#   )
# )
# :1:10–11: warning: alternation inside alternation is unnecessary
#  my_macro([[1 2] [3 4]])
#            ^
# :1:16–17: warning: alternation inside alternation is unnecessary
#  my_macro([[1 2] [3 4]])
#                  ^
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