GrPackageDefinition (@Nullable GrPackageDefinition newPackage) { final GrPackageDefinition oldPackage = getPackageDefinition(); if (oldPackage == null) { if (newPackage != null) { final GrPackageDefinition result = (GrPackageDefinition)addAfter(newPackage, null); getNode().addLeaf(GroovyTokenTypes.mNLS, "\n", result.getNode().getTreeNext()); return result; } } else { if (newPackage != null) { return (GrPackageDefinition)oldPackage.replace(newPackage); } else { oldPackage.delete(); } } return null; }