def test_vcs_tag_featurenew_build_always_stale(self):
        'https://github.com/mesonbuild/meson/issues/3904'
        vcs_tag = '''version_data = configuration_data()
        version_data.set('PROJVER', '@VCS_TAG@')
        vf = configure_file(output : 'version.h.in', configuration: version_data)
        f = vcs_tag(input : vf, output : 'version.h')
        '''
        msg = '.*WARNING:.*feature.*build_always_stale.*custom_target.*'
        self.assertMesonDoesNotOutput(vcs_tag, msg, meson_version='>=0.43')
https://github.com/mesonbuild/meson/issues/3904
unittests/failuretests.py