one would expect the lang tests to be selectable (using `-k`) using
`eval_okay` `eval_fail` etc though this was not the case so far.
This commit renames the functions to reflect the expected names
Change-Id: I4cd340c093d774feeb4d96820d28e49c665b159f
While the err file should always be empty, we prefer not have (easily
avoidable) warnings in the log, in order for actual warnings to be
spotted more easily.
Additionally this way no additional changes are required in case they
make use of some depreacted features in the future.
Change-Id: Ie078e2a851b2035d839f6b95d4188e475eb96b2d