private void assertNotLiveBeforeX(String src, String var) {
   FlowState<LiveVariablesAnalysis.LiveVariableLattice> state = getFlowStateAtX(src);
   assertTrue("Label X should be in the input program.", state != null);
   assertTrue(
       "Variable" + var + " should not be live before X",
       !state.getIn().isLive(liveness.getVarIndex(var)));
 }
 private void assertLiveBeforeX(String src, String var) {
   FlowState<LiveVariablesAnalysis.LiveVariableLattice> state = getFlowStateAtX(src);
   assertNotNull(src + " should contain a label 'X:'", state);
   assertTrue(
       "Variable" + var + " should be live before X",
       state.getIn().isLive(liveness.getVarIndex(var)));
 }