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I would like to step through, using debug() or trace(), a function that was not exported. For example, how can I do it for vcov.polr of the package MASS, which is called from the function polr. polr is exported, but vcov.polr is not.
That is, when I run polr, I would like the debug browser to start once the code enters vcov.polr.
try
note that three colon
:::make the hidden object in a package visible.