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Also note that the current specification is not correct: Procedure: hash-table-ref/default hash-table key default -> value Equivalent to (hash-table-ref hash-table key (lambda () default)).Consider default = ((lambda (x) (x x)) (lambda (x) (x x))). The program (hash-table-ref ht k (lambda () default)) diverges only when the key k is not found. The program (hash-table-ref/default ht k default) always diverges.
David