</pre>

<p>
The following built-in functions are not permitted in statement context:
</p>

<pre>
append cap complex imag len make new real
unsafe.Add unsafe.Alignof unsafe.Offsetof unsafe.Sizeof unsafe.Slice unsafe.SliceData unsafe.String unsafe.StringData
</pre>

<pre>
h(x+y)
f.Close()
&lt;-ch
(&lt;-ch)
len("foo")  // illegal if len is the built-in function
</pre>

- If a bad flag is supplied to a kubectl command, only a tip to run `--help` is printed, instead of the usage menu.  Usage menu is printed upon running `kubectl command --help`. ([#82423](https://github.com/kubernetes/kubernetes/pull/82423), [@sallyom](https://github.com/sallyom))

* removed unsafe double RLock in cpumanager ([#62464](https://github.com/kubernetes/kubernetes/pull/62464), [@choury](https://github.com/choury))

* Removed unsafe double RLock in cpumanager ([#62464](https://github.com/kubernetes/kubernetes/pull/62464), [@choury](https://github.com/choury))

## Non-user-facing changes

* azure: Add allow unsafe read from cache ([#83685](https://github.com/kubernetes/kubernetes/pull/83685), [@aramase](https://github.com/aramase))

* Bugfix allowing use of IP-aliases with custom-mode network in GCE setup scripts. ([#62172](https://github.com/kubernetes/kubernetes/pull/62172), [@shyamjvs](https://github.com/shyamjvs))
* removed unsafe double RLock in cpumanager ([#62464](https://github.com/kubernetes/kubernetes/pull/62464), [@choury](https://github.com/choury))



# v1.8.12

- Fixed a potential deadlock in the resource quota controller. Enabled recording partial usage info for quota objects specifying multiple resources, when only some of the resources' usage can be determined. ([#74747](https://github.com/kubernetes/kubernetes/pull/74747), [@liggitt](https://github.com/liggitt))

    * See https://istio.io/news/releases/0.x/announcing-0.6/ for full Isto release notes.
* removed unsafe double RLock in cpumanager ([#62464](https://github.com/kubernetes/kubernetes/pull/62464), [@choury](https://github.com/choury))

* azure: Add allow unsafe read from cache ([#83685](https://github.com/kubernetes/kubernetes/pull/83685), [@aramase](https://github.com/aramase))

// ---
// New uses of this type are discouraged because of difficulty describing its usage when embedded in APIs.
//  1. Ignored fields.  It includes many fields which are not generally honored.  For instance, ResourceVersion and FieldPath are both very rarely valid in actual usage.
//  2. Invalid usage help.  It is impossible to add specific help for individual usage.  In most embedded usages, there are particular