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GHC 6.12 dependency checking many times slower than 6.10

Get feldspar-language-0.1 from hackage and build it:

http://hackage.haskell.org/package/feldspar-language

http://hackage.haskell.org/packages/archive/feldspar-language/0.1/feldspar-language-0.1.tar.gz

Performance:

"cabal configure; cabal cuild; time cabal build"

6.12:
real    0m24.316s
user    0m24.063s
sys     0m0.159s

6.10:
real    0m2.252s
user    0m2.021s
sys     0m0.231s

"time cabal build" with 6.10 after "cabal build"-ing it with 6.12 (ie no "rm -rf dist" before building with 6.10)
real    0m24.304s
user    0m24.094s
sys     0m0.139s

The last one is especially strange.

Edited by Ian Lynagh -
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