@Nullable
  private static PsiType doNormalizeWildcardByPosition(
      final PsiType type, final GrExpression expression, final GrExpression toplevel) {
    if (type instanceof PsiCapturedWildcardType) {
      return doNormalizeWildcardByPosition(
          ((PsiCapturedWildcardType) type).getWildcard(), expression, toplevel);
    }

    if (type instanceof PsiWildcardType) {
      final PsiWildcardType wildcardType = (PsiWildcardType) type;

      if (PsiUtil.isAccessedForWriting(toplevel)) {
        return wildcardType.isSuper()
            ? wildcardType.getBound()
            : PsiCapturedWildcardType.create(wildcardType, expression);
      } else {
        if (wildcardType.isExtends()) {
          return wildcardType.getBound();
        } else {
          return PsiType.getJavaLangObject(expression.getManager(), expression.getResolveScope());
        }
      }
    } else if (type instanceof PsiArrayType) {
      final PsiType componentType = ((PsiArrayType) type).getComponentType();
      final PsiType normalizedComponentType =
          doNormalizeWildcardByPosition(componentType, expression, toplevel);
      if (normalizedComponentType != componentType) {
        assert normalizedComponentType != null;
        return normalizedComponentType.createArrayType();
      }
    }

    return type;
  }
  @Nullable
  public static PsiType normalizeWildcardTypeByPosition(
      @NotNull PsiType type, @NotNull GrExpression expression) {
    GrExpression toplevel = expression;
    while (toplevel.getParent() instanceof GrIndexProperty
        && ((GrIndexProperty) toplevel.getParent()).getInvokedExpression() == toplevel) {
      toplevel = (GrExpression) toplevel.getParent();
    }

    final PsiType normalized = doNormalizeWildcardByPosition(type, expression, toplevel);
    if (normalized instanceof PsiClassType && !PsiUtil.isAccessedForWriting(toplevel)) {
      return com.intellij.psi.util.PsiUtil.captureToplevelWildcards(normalized, expression);
    }

    return normalized;
  }
  @Override
  protected void processIntention(@NotNull PsiElement element, Project project, Editor editor)
      throws IncorrectOperationException {
    final GrField field;
    if (element.getParent() instanceof GrField) {
      field = (GrField) element.getParent();
    } else {
      final PsiReference ref = element.getReference();
      LOG.assertTrue(ref != null);
      PsiElement resolved = ref.resolve();
      if (resolved instanceof GrAccessorMethod) {
        resolved = ((GrAccessorMethod) resolved).getProperty();
      }
      LOG.assertTrue(resolved instanceof GrField);
      field = (GrField) resolved;
    }

    final HashSet<PsiReference> usages = new HashSet<PsiReference>();
    usages.addAll(ReferencesSearch.search(field).findAll());
    final GrAccessorMethod[] getters = field.getGetters();
    for (GrAccessorMethod getter : getters) {
      usages.addAll(MethodReferencesSearch.search(getter).findAll());
    }
    final GrAccessorMethod setter = field.getSetter();
    if (setter != null) {
      usages.addAll(MethodReferencesSearch.search(setter).findAll());
    }

    final String fieldName = field.getName();
    LOG.assertTrue(fieldName != null);
    final Collection<PsiElement> fieldUsages = new HashSet<PsiElement>();
    MultiMap<PsiElement, String> conflicts = new MultiMap<PsiElement, String>();
    for (PsiReference usage : usages) {
      final PsiElement psiElement = usage.getElement();
      if (PsiUtil.isMethodUsage(psiElement)) continue;
      if (!GroovyFileType.GROOVY_LANGUAGE.equals(psiElement.getLanguage())) {
        conflicts.putValue(
            psiElement,
            GroovyIntentionsBundle.message("closure.is.accessed.outside.of.groovy", fieldName));
      } else {
        if (psiElement instanceof GrReferenceExpression) {
          fieldUsages.add(psiElement);
          if (PsiUtil.isAccessedForWriting((GrExpression) psiElement)) {
            conflicts.putValue(
                psiElement,
                GroovyIntentionsBundle.message("write.access.to.closure.variable", fieldName));
          }
        } else if (psiElement instanceof GrArgumentLabel) {
          conflicts.putValue(
              psiElement,
              GroovyIntentionsBundle.message("field.is.used.in.argument.label", fieldName));
        }
      }
    }
    final PsiClass containingClass = field.getContainingClass();
    final GrExpression initializer = field.getInitializerGroovy();
    LOG.assertTrue(initializer != null);
    final PsiType type = initializer.getType();
    LOG.assertTrue(type instanceof GrClosureType);
    final GrSignature signature = ((GrClosureType) type).getSignature();
    final List<MethodSignature> signatures =
        GrClosureSignatureUtil.generateAllMethodSignaturesBySignature(fieldName, signature);
    for (MethodSignature s : signatures) {
      final PsiMethod method = MethodSignatureUtil.findMethodBySignature(containingClass, s, true);
      if (method != null) {
        conflicts.putValue(
            method,
            GroovyIntentionsBundle.message(
                "method.with.signature.already.exists",
                GroovyPresentationUtil.getSignaturePresentation(s)));
      }
    }
    if (conflicts.size() > 0) {
      final ConflictsDialog conflictsDialog =
          new ConflictsDialog(
              project,
              conflicts,
              new Runnable() {
                @Override
                public void run() {
                  execute(field, fieldUsages);
                }
              });
      conflictsDialog.show();
      if (conflictsDialog.getExitCode() != DialogWrapper.OK_EXIT_CODE) return;
    }
    execute(field, fieldUsages);
  }