public void visitClosure(GrClosableBlock closure) {
    // do not go inside closures except gstring injections
    if (closure.getParent() instanceof GrStringInjection) {
      for (GrParameter parameter : closure.getAllParameters()) {
        if (myPolicy.isVariableInitialized(parameter)) {
          addNode(new ReadWriteVariableInstruction(parameter.getName(), parameter, WRITE));
        }
      }
      addNode(new ReadWriteVariableInstruction("owner", closure.getLBrace(), WRITE));

      super.visitClosure(closure);
      return;
    }

    ReadWriteVariableInstruction[] reads =
        ControlFlowBuilderUtil.getReadsWithoutPriorWrites(closure.getControlFlow(), false);
    for (ReadWriteVariableInstruction read : reads) {
      PsiElement element = read.getElement();
      if (!(element instanceof GrReferenceExpression)
          || myPolicy.isReferenceAccepted((GrReferenceExpression) element)) {
        addNodeAndCheckPending(
            new ReadWriteVariableInstruction(read.getVariableName(), closure, READ));
      }
    }

    addNodeAndCheckPending(new InstructionImpl(closure));
  }
  private void buildFlowForClosure(final GrClosableBlock closure) {
    for (GrParameter parameter : closure.getAllParameters()) {
      if (myPolicy.isVariableInitialized(parameter)) {
        addNode(new ReadWriteVariableInstruction(parameter.getName(), parameter, WRITE));
      }
    }

    addNode(new ReadWriteVariableInstruction("owner", closure.getLBrace(), WRITE));

    PsiElement child = closure.getFirstChild();
    while (child != null) {
      if (child instanceof GroovyPsiElement) {
        ((GroovyPsiElement) child).accept(this);
      }
      child = child.getNextSibling();
    }

    final GrStatement[] statements = closure.getStatements();
    if (statements.length > 0) {
      handlePossibleReturn(statements[statements.length - 1]);
    }
  }