when typing expression fails, don't try to Show it

[pimlott]

Enter a ghci session, and run "print id":

Prelude> print id

Top level:
    No instance for (Show (IO ()))
      arising from use of `print' at Top level
    Probable fix: add an instance declaration for (Show
(IO ()))
    In a 'do' expression: print it

<interactive>:1:0:
    No instance for (Show (a -> a))
      arising from use of `print' at <interactive>:1:0-4
    Probable fix: add an instance declaration for (Show
(a -> a))
    In the definition of `it': it = print id

It would be nice to make the first error go away.  It
looks as if, when typing "print id" fails, ghci
nonetheless goes ahead and tries to type "let it =
print id; print it", or something.  This just creates
useless noise.

[simonmar]

Logged In: YES 
user_id=48280

duplicate of #1156554, and already fixed in the HEAD:

Prelude> print id

<interactive>:1:0:
    No instance for (Show (a -> a))
      arising from use of `print' at <interactive>:1:0-4
    Probable fix: add an instance declaration for (Show (a
-> a))
    In the definition of `it': it = print id

though this fix won't be in 6.4.1 (it makes some other
changes to the way GHCi interaction works, so I'm being
conservative here).

[pimlott]

Logged In: YES 
user_id=498741

Great. (I realize I was only searching open bugs, so I
didn't see the existing report.)