quoting in error messages

Hi,

This is quite a minor issue but I just wanted to point out that it
would be a little easier on the eye to use double quotes rather than
paired single quotes in error messages e.g.:

    Couldn't match the rigid variable `d'' against `Bar a'
      `d'' is bound by the polymorphic type `forall d d'.
                                             (Data d, Data d') =>
                                             t d d' -> t d d''

Thanks,

Frederik

-- 
http://ofb.net/~frederik/