[Hackage] #597: non-exhaustive patterns when trying to install
base
Hackage
trac at galois.com
Sat Oct 3 04:43:33 EDT 2009
#597: non-exhaustive patterns when trying to install base
---------------------------------+------------------------------------------
Reporter: guest | Owner:
Type: defect | Status: new
Priority: normal | Milestone:
Component: cabal-install tool | Version: 1.6.0.2
Severity: minor | Resolution:
Keywords: | Difficulty: normal
Ghcversion: 6.10.1 | Platform:
---------------------------------+------------------------------------------
Changes (by duncan):
* difficulty: unknown => normal
* summary: non-exhaustive patterns in lambda => non-exhaustive patterns
when trying to install base
* severity: normal => minor
* platform: Mac OS =>
Comment:
The key bit is:
{{{
$ cabal install base
Resolving dependencies...
cabal: Distribution/Client/Dependency/TopDown.hs:170:37-73: Non-exhaustive
patterns in lambda
}}}
Yep, trying to install base will not work. We should produce a better
error message though.
As for the other bits, your getting confused about the error messages. The
message you get when the profiled version is missing is different. The
regex-dfa-0.91 package really is from the ghc-6.6 era and is missing the
dependency on the containers package.
The problem when you build containers is that the package does not specify
the version of base that it needs. It needs version 4 but does not say so,
and by default cabal will pick base 3, because that's the choice that
makes all the older stuff work. But as I say, you've got the profiled
version of containers already, so don't re-install it.
--
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/597#comment:1>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects
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