[ ghc-Bugs-1247773 ] when typing expression fails, don't try to Show it

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Bugs item #1247773, was opened at 2005-07-29 19:15
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Category: GHCi
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Andrew Pimlott (pimlott)
Assigned to: Nobody/Anonymous (nobody)
Summary: when typing expression fails, don't try to Show it

Initial Comment:
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.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=108032&aid=1247773&group_id=8032