[Haskell-cafe] Debugging Haskell code

Dougal Stanton ithika at gmail.com
Tue Sep 29 18:05:29 EDT 2009

On Sun, Sep 27, 2009 at 9:17 PM, Paul Moore <p.f.moore at gmail.com> wrote:

> That's odd, it seems to be saying it's not installed at all! Hmm, no -
> I did a cabal install --user (because Vista doesn't let me do
> site-wide installs), looks like cabal list doesn't pick up user
> installs.
> Hmm, cabal install mersenne-random --user didn't do anything, but
> cabal install mersenne-random --user --reinstall did reinstall it, and
> now it seems to work.

To find out what GHC picks up automatically:

$ ghc-pkg list
    Cabal-, HUnit-, QuickCheck-, array-,
    base-, base-, bytestring-, containers-,
    directory-, (dph-base-0.3), (dph-par-0.3),
    (dph-prim-interface-0.3), (dph-prim-par-0.3), (dph-prim-seq-0.3),
    (dph-seq-0.3), extensible-exceptions-, filepath-,
    (ghc-6.10.3), ghc-prim-, haddock-2.4.2, haskell-src-,
    haskell98-, hpc-, html-, integer-,
    mtl-, network-2.2.1, old-locale-, old-time-,
    packedstring-, parallel-, parsec-,
    pretty-, process-, random-,
    regex-base-, regex-compat-, regex-posix-,
    rts-1.0, stm-, syb-, template-haskell-,
    time-1.1.3, unix-, xhtml-3000.2.0.1
    HTTP-4000.0.4, X11-1.4.5, X11-xft-0.3, benchpress-,
    cairo-0.10.1, colour-2.3.0, cpphs-1.9, darcs-2.2.1,
    data-default-0.2, diagrams-0.2, gd-3000.4.0, gio-0.10.1,
    glib-0.10.1, gtk-0.10.1, hashed-storage-0.3.7, haskeline-,
    haskell-src-exts-1.1.4, hscolour-1.15, mmap-0.4.1, soegtk-0.10.1,
    split-0.1.1, svgcairo-0.10.1, tagsoup-0.6, terminfo-,
    terminfo-, uniplate-, utf8-string-0.3.4,
    xmonad-0.8.1, xmonad-contrib-0.8.1, zlib-, zlib-

You should get everything hanging about, installed system-wide or in
your home directory. I assume this works much the same for Windows.


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