@Override
        public void visitReferenceExpression(@NotNull PsiReferenceExpression expression) {
          if (!result.get().booleanValue()) {
            return;
          }
          super.visitReferenceExpression(expression);
          final PsiElement target = expression.resolve();
          if (!(target instanceof PsiVariable)) {
            return;
          }
          final PsiElement[] defs = DefUseUtil.getDefs(block, (PsiVariable)target, cause);
          for (PsiElement def : defs) {
            if (def.getTextOffset() > offset) {
              result.set(Boolean.FALSE);
            }
          }
        }
@Override
        public void visitReferenceExpression(@NotNull PsiReferenceExpression expression)