By M. Stella Atkins
Communications of the ACM,
January 1973,
Vol. 16 No. 1, Pages 47-48
10.1145/361932.361946
Comments
The Elliott (I.C.L.) Algol 60 compiler contains a restriction on the sequence of declarations such that no identifier may be used before it is declared. This means that direct mutual recursion between procedures declared in the same blockhead is not possible.
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