javascript - PureScript does not compose `trace` and `show` -

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तो निम्न कार्य करता है 

  मुख्य = ट्रेस $ $ $ दिखाने   
 लेकिन यह नहीं है  
  मुख्य = do (ट्रेस। शो) 5   
 में psci का प्रकार है  
  forall r Prim.String - & gt; Control.Monad.Eff.Eff (trace :: debug.Trace.Trace | r) प्रस्तावना। यूनिट   
 और शो का प्रकार है  
  forall ए। (प्रील्यू। एक देखें) = & gt; ए - & gt; Prim.String   
 क्योंकि शो का रिटर्न वैल्यू  Prim.String  है और पहले इनपुट में ट्रेस है  Prim.String  उन्हें चाहिए कंपोज़ योग्य हो इसके आगे यह पता चला है कि  ट्रेस $ शो  प्रकार जांच से गुजरता है लेकिन इसके बजाय मुझे यह त्रुटि मिलती है:  
  त्रुटि 1 लाइन में, कॉलम 10: घोषणा में त्रुटि यह Prim.Function Prim.String के साथ Prim.Object को एकजुट नहीं कर सकता।   
 मुझे यहाँ क्या याद आ रही है? अभी मेरा मानसिक मॉडल यह है कि हाससेल में  ट्रेस  बहुत ही  putStrLn  जैसा है, और यह निश्चित रूप से  शो  से बना हो सकता है।  (putStrLn। Show) 5  काम करता है।  
 ट्रेस और शो के रचना परिणाम का अपेक्षित प्रकार:  
  एक आर (प्रील्यू। एक देखें) = & gt; ए - & gt; Control.Monad.Eff.Eff (trace :: debug.Trace.Trace | r) प्रस्तावना। यूनिट    
 
 
 ।  फ़ंक्शन संरचना नहीं है, लेकिन शुद्ध स्क्रिप्ट में, जैसा कि  
  मुख्य = शो $ {test:" नमस्कार, स्ट्रिंग प्रॉपर्टी "}   
 फ़ंक्शन संरचना ऑपरेटर को  & lt; & lt; & lt;  कहा जाता है, संभवतः उसके बाद।

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