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If the calling environment does not have the next method to be invoked in the inheritance chain cached yet, this will find the next method (using findNextMethod(), and cache it in the calling environment such that a subsequent call to methods::callNextMethod() will find and use it.




As per the description, what this function does would normally already be done by invoking methods::callNextMethod(), so in theory this should be entirely redundant at best. However, methods::addNextMethod(), which is invoked by callNextMethod() if a next method isn't cached yet, is broken (errors out) if one of the classes in the signature name-clashes with a class defined in another package. Calling this function prior to callNextMethod() is meant to work around that.