I sometimes find that a function I have defined has the same name as an R
core function. In most cases I have no desire to redefine the core R
function and would prefer to give my function a different name.

The problem is that R lets users redefine its core functions without any
warning. Is there a way to cause R to generate a warning if a core function
is being redefined?

To give an actual example, in my personal library of functions I have a
'seek' function. I recently noticed that seek(con, ...) is part of base R.
Now I plan to rename my personal 'seek' function but would have benefited
from a warning when I first created this function.

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