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According to Hewitt, Peter Landin had introduced an even more powerful control structure using his " J " ( for Jump ) operator that could perform a non-local goto into the middle of a procedure invocation.
In fact the " J " operator could jump back into the middle of a procedure invocation even after it had already returned.
Drew McDermott and Gerald Sussman called Landin's concept the " Hairy Control Structure " and used it in the form of a nonlocal goto for the Conniver programming language.
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