#143: System.Process readProcess incorrect documentation of return value
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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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