Add a FIXME.

bd25285f · Mikhail Glushenkov · d6545bc2 · bd25285f
Commit bd25285f authored Sep 04, 2013 by Mikhail Glushenkov
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Cabal/Distribution/Simple/PackageIndex.hs Cabal/Distribution/Simple/PackageIndex.hs +2 -0

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--- a/Cabal/Distribution/Simple/PackageIndex.hs
+++ b/Cabal/Distribution/Simple/PackageIndex.hs
@@ -106,6 +106,8 @@ data PackageIndex = PackageIndex
  -- of the same package version. These are unique by InstalledPackageId
  -- and are kept in preference order.
  --
+  -- FIXME: Clarify what "preference order" means. Check that this invariant is
+  -- preserved. See #1463 for discussion.
  !(Map PackageName (Map Version [InstalledPackageInfo]))

  deriving (Show, Read)