You can clone with
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Bug 15374 at r-project.org does not occur in pqR, but a more elaborate version of it does, as seen below
> l = list(list(list(1)))
> l1 = l[]
> l[[c(1,1,1)]] <- 2
Now fixed on development branch "14". Will also be fixed in the next release.
Now fixed in the release of 2013-07-19.