[Haskell-cafe] ghc6.8: hiding uninstalled package?
Albert Y. C. Lai
trebla at vex.net
Thu Jan 17 13:08:58 EST 2008
Magnus Therning wrote:
> This might seem like a silly question, but what's the reasoning behind
> the following behaviour?
> % ghc-pkg list dataenc
> % ghc --make -hide-package dataenc -isrc UT.hs
> ghc-6.8.2 : unknown package: dataenc
> Hiding an uninstalled package doesn't seem to warrant failing compilation!
"I cannot find it, therefore I cannot hide it"? XD
The following is fairly widely accepted behaviour:
$ rm phd-thsies
rm: cannot remove `phd-thsies': No such file or directory
If a file is absent and you want it absent, is that an error?
(Now you might get into a long thread debating whether deletion is
analogous to hiding...)
If I want to hide or delete something, and the computer can't find that
something, it may be because I have a typo. If the computer remains
silent about it, I fail to hide or delete the true thing. I want to
delete phd-thesis, but I typed phd-thsies, and I appreciate the error
report. If I fail to delete phd-thesis, at worst more people read it and
be enlightened :) but if I fail to hide a package and I don't know about
it, the ensuing problems will be much more mysterious.
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