[haskell-platform] #143: System.Process readProcess incorrect documentation of return value

[haskell-platform]

#143: System.Process readProcess incorrect documentation of return value
------------------------------+---------------------------------------------
 Reporter:  benc              |       Owner:     
     Type:  defect            |      Status:  new
 Priority:  minor             |   Milestone:     
Component:  (none-specified)  |    Keywords:     
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 The System.Process docs here:

 http://haskell.org/ghc/docs/6.12.2/html/libraries/process-1.0.1.2/System-
 Process.html#v%3AreadProcess

 describes the return value as:

 > returns either the output string, or, in the case of non-zero exit
 > status, an error code, and any output.

 and the given example output is:

 >   Right "Thu Feb  7 10:03:39 PST 2008\n"

 This suggests that the return value looks like:

 IO (Either ? String)

 But the return type is shown (in that same documentation, and in ghci
 6.12.3) as IO String, and my own experimentation shows no "Right" being
 returned in the case of a successful operation - instead I get only the
 String containing the program output, not wrapped.

 Perhaps this is historic.

-- 
Ticket URL: <http://trac.haskell.org/haskell-platform/ticket/143>
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