[Haskell-cafe] Odd error message from ghc --make

[Jeff Heard]

I was just running a test that has compiled before just fine, and now
I'm getting this rather odd message:

EventBusTest.hs:20:9:
    Couldn't match expected type `Bus a'
           against inferred type `buster-1.1:App.EventBus.Bus
                                    [buster-1.1:App.EventBus.EData a1]'
      Expected type: MVar (Bus a)
      Inferred type: MVar
                       (buster-1.1:App.EventBus.Bus
[buster-1.1:App.EventBus.EData a1])
    In the expression: mk
    In the first argument of `bus', namely `[mk]'


Any ideas?  I mean, it looks like it type checks to me.