haskellemacshaskell-platformhaskell-modehaskell-prelude

How to resolve issues when getting error: Not in scope

*Main> :t putStrn

<interactive>:1:1:
Not in scope: `putStrn'
Perhaps you meant one of these:  
  `putStr' (imported from Prelude),  
  `putStrLn' (imported from Prelude)

Please note that I am practising haskell programming in emacs with haskell mode.

Even while using terminal, I am getting following error:

optimight@optimight:~$ ghci  
GHCi, version 7.4.1: http://www.haskell.org/ghc/  :? for help  
Loading package ghc-prim ... linking ... done. 
Loading package integer-gmp ... linking ... done.  
Loading package base ... linking ... done.  
Prelude> :set prompt ghci>  
ghci>:t putStrln   

<interactive>:1:1:  
    Not in scope: `putStrln'  
    Perhaps you meant one of these:  
      `putStrLn' (imported from Prelude),  
      `putStr' (imported from Prelude)
Solution

  • The I/O action you are looking for is putStrLn. Note the capital L — Haskell symbols are case-sensitive — just before the final n, as in “put a string on a line of its own.”.