fix tiny typo in arith.rkt
in racket guide
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@ -40,7 +40,7 @@
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(define op (to-syntax (string->symbol op-str)
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(define op (to-syntax (string->symbol op-str)
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(+ delta a-len) op-str))
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(+ delta a-len) op-str))
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(to-syntax (list op a b) delta s)]
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(to-syntax (list op a b) delta s)]
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[else (to-syntax (or (string->number s)
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[_ (to-syntax (or (string->number s)
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(string->symbol s))
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(string->symbol s))
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delta s)]))
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delta s)]))
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