By James H. Morris
Communications of the ACM,
Vol. 15 No. 8, Page 773
In  van Wijngaarden presented a rather remarkable technique for rewriting ALGOL 60 programs to eliminate all labels. The purpose of this note is to point out that the rewriting would also eliminate the use of array returning (procedure returning, label returning, etc.) procedures had they been legal constructs of ALGOL 60. Hence, the many languages which allow such things to be returned as procedure values are not such large extensions of ALGOL 60 as one might think [2, 3, 4, 5].
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