Clean build ASSERT failure

[Simon Peyton Jones]

I'm seeing this assertion failure when using the stage1 compiler (built with -DDEBUG) to compile the stage2 compiler.  Is anyone else seeing this?
Simon

ghc-stage1.exe: panic! (the 'impossible' happened)
  (GHC version 7.9.20140227 for i386-unknown-mingw32):
          ASSERT failed!
    file compiler\basicTypes\Demand.lhs line 445
    3
    [U]

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

compiler/ghc.mk:642: recipe for target 'compiler/stage2/build/ParserCore.o' failed
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/ghc-devs/attachments/20140228/2c6e605d/attachment.html>