@Deprecated
  public static void isInstalledAssertion() {
    final ProxySelector aDefault = ProxySelector.getDefault();
    if (CommonProxyCompatibility.mainProxySelector != null && CommonProxyCompatibility.mainProxySelector != aDefault) {
      // to report only once
      if (ourWrong != aDefault || itsTime()) {
        LOG.error("ProxySelector.setDefault() was changed to [" + aDefault.toString() + "] - other than com.intellij.util.proxy.CommonProxy.myMainProxySelector.\n" +
                  "This will make some " + ApplicationNamesInfo.getInstance().getProductName() + " network calls fail.\n" +
                  "Instead, methods of com.intellij.util.net.ProxyService should be used for proxying.");
        ourWrong = aDefault;
      }
      ProxySelector.setDefault(CommonProxyCompatibility.mainProxySelector);
      ourInstance.ensureAuthenticator();
    }
    assertSystemPropertiesSet();
  }
@Deprecated
  public static void isInstalledAssertion()