This blog is updated daily..
A general description is here.
‘R CMD check --as-cran’ notes assignments to the global environment, calls to ‘data()’ which load into the global environment, and calls to ‘attach()’.
The ‘tcltk’ namespace can now be re-loaded after unloading.
The Tcl/Tk event loop is inhibited in a forked child (as in e.g. ‘mclapply()’.