Fix ANTLR warning
Fix ANTLR warning


Former-commit-id: 402ac3b5b6242616e2e22bca9615f1b8c2759593
julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine