16 lines
258 B
Racket
16 lines
258 B
Racket
#;
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(exn:pred #rx"Expected Zero, but got (U Negative-Integer Positive-Integer)")
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#lang typed/racket
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;; test even? filter
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(: foo (Integer -> String))
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(define (foo n)
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(if (even? n)
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"dummy"
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(z n)))
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(: z (Zero -> String))
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(define (z x) "dummy")
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