The `primitive` package exports a lifted version of the undocumented `touch#`
http://hackage.haskell.org/package/ghc-prim-0.3.1.0/docs/GHC-Prim.html
which has type:
touch :: PrimMonad m => a -> m ()
I'd like to know if this works correctly in general, or will it suffer
from the same gotches w/r/t unboxing as with addFinalizer and Weak
references? i.e. must it only be passed an unboxed type?
Brandon
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