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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2016-02-24T21:09:52Z"
+ content="""
+`checkResult` is the key to understanding this. Its (simplified) type
+signature:
+
+	checkResult :: m a -> (a -> m Result) -> p i -> Property i
+
+It's being given getstat as the first parameter. It runs that before the
+property does anything, and it passes that value to comparestat.
+
+So, oldstat is the getstat value from before the property did anything.
+"""]]