Containers patch for GHC 7.0

Dear Container folk GHC 7.0 is going to warn about lambdas with incomplete patterns (if you have -fwarn-incomplete-patterns), such as \[x] -> e The Sequence module in 'containers' has a couple of occurrences, which the enclosed patch fixes. Of course there's no change in functionality, or even what code is generated. Can you apply please Simon