> It was just that the guide didn't mention that using > MLton.Rusage,rusage wouldset the flag to true initially OK, I added to the docs. > I didn't see any place in the code that was doing it. It's in basis-library/mlton/rusage.sml. We rely on the unsafe basis-library dead-code elimination to take out the call to "measureGC true" if it's not used.