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Based on ferg's answer to a related question, in the arduino IDE I went to File, Preferences and selected verbose build. With that I discovered that the IDE was using an old, backup copy of ros_lib. I thought it would not do that since I had renamed the folder ros_lib_old, but forgot that odd things happen in arduino libraries that have more than one file with the same name, even if they are in different directories.

So just moving the backup copy from the libraries folder fixed the problem.