From: Simon Marlow <simonmar@microsoft.com>
Date: Thu, 26 Apr 2007 08:36:57 +0000 (+0000)
Subject: Give a better error message when we try to print a value of unknown type
X-Git-Tag: 2007-05-06~96
X-Git-Url: http://git.megacz.com/?a=commitdiff_plain;h=97351f5d70e2d5797a092059cb205089d55dacc6;hp=97351f5d70e2d5797a092059cb205089d55dacc6;p=ghc-hetmet.git

Give a better error message when we try to print a value of unknown type

  Stopped at ../Test3.hs:(1,0)-(2,30)
  _result :: [a]
  [../Test3.hs:(1,0)-(2,30)] *Main> _result

  <interactive>:1:0:
      Ambiguous type variable `a' in the constraint:
        `Show a' arising from a use of `print' at <interactive>:1:0-6
      Cannot resolve unkonwn runtime types: a
      Use :print or :force to determine these types
---