new method incorrectly generated since Scala 2.12.3

[raboof]

This method doesn't seem to show up in javap, so it looks like a bug in genjavadoc that this now shows up?

Originally posted by @raboof in #313 (comment)

[SethTisue]

as per #313 (comment), this isn't a new issue in 2.12.17, but goes way back