haskell if exception -

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मेरे पास ऐसा कुछ है 

  isLastPermutation (h: t) = पकड़ (nextPermutation H: t)) (\ e- & gt; वापस सही) वापस लौटें   
 कुछ मामलों में  अगलाप्रतिष्ठापन  एक अपवाद फेंकता है और मैं अपना कार्य चाहते हैं  isLastPermutation  सही करने के लिए अगर  अगलाप्रतिष्ठापन  अपवाद अन्यथा गलत है।   
 
 
 अन्यथा शुद्ध हास्केल में प्रवाह-नियंत्रण के लिए अपवाद का उपयोग न करें।  शायद  या  या तो  का उपयोग करें।

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