Extreme memory usage (probably type functions)

This is with the ghc 6.10.1 rc:

http://darcs.haskell.org/ghc-STABLE-2008-09-19-ghc-corelibs-testsuite.tar.bz2, unpacked, then ./darcs-all --extra get and ./darcs-all pull -a

Then a perf build.

Then, wget http://hackage.haskell.org/packages/archive/sessions/2008.7.18/sessions-2008.7.18.tar.gz, unpack and cd sessions-2008.7.18

ghci-6.8.3 Tests/Tests.hs. This takes 40 seconds to get to the prompt and uses about 700MB memory.

ghci-6.10.0.20081004 Tests/Tests.hs. This has not finished type checking yet (well over 5 mins now - it exhaused my 4GB RAM and is now eating its way through 16GB of swap). top reports it's currently using about 5GB memory.

Trac metadata

Trac field	Value
Version	6.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Type checker)
Test case
Differential revisions
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Blocking
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Operating system
Architecture