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divert(`-1') # foreach(x, (item_1, item_2, ..., item_n), stmt) # parenthesized list, simple version define(`foreach', `pushdef(`$1')_foreach($@)popdef(`$1')') define(`_arg1', `$1') define(`_foreach', `ifelse(`$2', `()', `', `define(`$1', _arg1$2)$3`'$0(`$1', (shift$2), `$3')')') divert`'dnl