// elapses.
	//
	// Done is provided for use in select statements:
	//
	//  // Stream generates values with DoSomething and sends them to out
	//  // until DoSomething returns an error or ctx.Done is closed.
	//  func Stream(ctx context.Context, out chan<- Value) error {
	//  	for {
	//  		v, err := DoSomething(ctx)
	//  		if err != nil {
	//  			return err
	//  		}
	//  		select {
	//  		case <-ctx.Done():

[[invalid_use_of_cacheable_annotation]]
== Invalid use of cacheable annotation

This error indicates that you have annotated a type with `@CacheableTransform` on something that is not an artifact transform, or `@CacheableTask` on something which is not a `Task`.

The solution is to remove the annotation.

For tasks, the annotation to use is `@CacheableTask`.

`Optional[Something]` là một cách viết ngắn gọn của `Union[Something, None]`, chúng là tương đương nhau.

Điều này cũng có nghĩa là trong Python 3.10, bạn có thể sử dụng `Something | None`:

=== "Python 3.10+"

    ```Python hl_lines="1"
    {!> ../../../docs_src/python_types/tutorial009_py310.py!}
    ```

But at some point, there was no other option than creating something that provided all these features, taking the best ideas from previous tools, and combining them in the best way possible, using language features that weren't even available before (Python 3.6+ type hints).

## Previous tools

		if !modfile.GoVersionRE.MatchString(*editGo) {
			base.Fatalf(`go work: invalid -go option; expecting something like "-go %s"`, gover.Local())
		}
	}
	if *editToolchain != "" && *editToolchain != "none" {
		if !modfile.ToolchainRE.MatchString(*editToolchain) {
			base.Fatalf(`go work: invalid -toolchain option; expecting something like "-toolchain go%s"`, gover.Local())
		}
	}

	anyFlags := *editGo != "" ||

  // Ensure that it compile
  ASSERT_TRUE(compilation_result.ok());
  // Assert that the tensor list operation is lowered to something.
  ASSERT_THAT(compilation_result,
              Not(ComputationProtoContains("%.*= \"tf.TensorListSetItem")));
  // Assert that the tensor list operation is lowered to something that doesn't
  // get stuck on a broken dynamic update slice.
  ASSERT_THAT(compilation_result,

func (l *gcCPULimiterState) startGCTransition(enableGC bool, now int64) {
	if !l.tryLock() {
		// This must happen during a STW, so we can't fail to acquire the lock.
		// If we did, something went wrong. Throw.
		throw("failed to acquire lock to start a GC transition")
	}
	if l.gcEnabled == enableGC {
		throw("transitioning GC to the same state as before?")
	}

        }
    }

    def "reports failed project configuration progress events"() {
        given:
        buildFile << """
            throw new GradleException("something went horribly wrong")
        """

        when:
        runBuild("tasks")

        then:
        thrown(BuildException)
        with(events.operation("Configure project :")) {
            failed

        // This test is checking only for successful (single) matches. If we matched multiple configurations
        // in the first round, something is wrong here. Fail before attempting the second round of variant matching.
        assert configurationMatches.size() == 1

`Optional[Something]` ist tatsächlich eine Abkürzung für `Union[Something, None]`, diese beiden sind äquivalent.

Das bedeutet auch, dass Sie in Python 3.10 `Something | None` verwenden können:

=== "Python 3.10+"

    ```Python hl_lines="1"
    {!> ../../../docs_src/python_types/tutorial009_py310.py!}