patch applied (ghc): Help the user when she tries to do :history without :trace

Pepe Iborra mnislaih at gmail.com
Sun Dec 9 13:44:54 EST 2007


Sat Dec  8 10:09:18 PST 2007  Pepe Iborra <mnislaih at gmail.com>
  * Help the user when she tries to do :history without :trace
  
  Teach GHCi to show a "perhaps you forgot to use :trace?" when
  it finds that the user is trying to retrieve an empty :history
  

    M ./compiler/ghci/InteractiveUI.hs -9 +13



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