Brian R makes good points.
I made a mistake in the prior post, it should have said
new.env(parent=globalenv())
for pspline. You want the saved function to pay attention to the search()
path.
This is what is actually in the code, I was guilty of mistyping.
If the print function uses a not-exported function from the enclosing package
then we need to be more careful. This is the case for rpart.
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