• Simon Marlow's avatar
    Give a better error message when we try to print a value of unknown type · 97351f5d
    Simon Marlow authored
      Stopped at ../Test3.hs:(1,0)-(2,30)
      _result :: [a]
      [../Test3.hs:(1,0)-(2,30)] *Main> _result
          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
GHC.hs 86.5 KB