// This allows another goroutine to close the reader.
	pr.closedMu.Lock()
	defer pr.closedMu.Unlock()
	if pr.closed {
		return 0, errors.New("progressReader: read after Close")
	}
	return pr.processedReader.Read(p)
}

func (pr *progressReader) Close() error {
	pr.closedMu.Lock()
	defer pr.closedMu.Unlock()
	if pr.closed {
		return nil
	}
	pr.closed = true

                                    TracingTensorHandle**) = 0;

  // Finalize this context and make a function out of it. The context is in a
  // invalid state after this call and must be destroyed.
  virtual absl::Status Finalize(OutputList* outputs, AbstractFunction**) = 0;

  // For LLVM style RTTI.
  static bool classof(const AbstractContext* ptr) {

            val introStart = content.indexOf(FIXED_ISSUES_INTRO)
            val afterIntro = introStart + FIXED_ISSUES_INTRO.length
            // Find the end of the issues list: the first non-list line after the intro
            val listEnd = findEndOfListSection(content, afterIntro)
            content.substring(0, introStart) + newSection + "\n" + content.substring(listEnd)
        } else {

  public void testAddAtIndex_nullUnsupported() {
    assertThrows(NullPointerException.class, () -> getList().add(0, null));
    expectUnchanged();
    expectNullMissingWhenNullUnsupported("Should not contain null after unsupported add(n, null)");
  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)
  public void testAddAtIndex_negative() {
    assertThrows(IndexOutOfBoundsException.class, () -> getList().add(-1, e3()));

Pruning the entire Cache to clear space temporarily can be done using evictAll.

```kotlin
cache.evictAll()
```

Removing individual items can be done using the urls iterator.
This would be typical after a user initiates a force refresh by a pull to refresh type action.

```java
    val urlIterator = cache.urls()
    while (urlIterator.hasNext()) {
      if (urlIterator.next().startsWith("https://www.google.com/")) {

        file("src/test/java/org/acme/${clazzName}.java") << """
            import org.junit.Test;
            import org.junit.Before;
            import org.junit.After;
            import org.junit.Assert;
            import java.nio.*;
            import java.nio.file.*;
            import java.io.IOException;
            
            public class $clazzName {

		return errors.New("ScanRange: No Start or End specified")
	}
	if s.Start == nil || s.End == nil {
		return nil
	}
	if *s.Start > *s.End {
		return errors.New("ScanRange: Start cannot be after end")
	}
	return nil
}

// StartLen returns start offset plus length from range.
func (s *ScanRange) StartLen() (start, length int64, err error) {
	if s == nil {
		return 0, -1, nil
	}

    assertThrows(NullPointerException.class, () -> getList().addAll(0, containsNull));
    expectUnchanged();
    expectNullMissingWhenNullUnsupported(
        "Should not contain null after unsupported addAll(n, containsNull)");
  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)
  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testAddAllAtIndex_middle() {
    assertTrue(

			return prefix, token, startAfter, delimiter, fetchOwner, maxkeys, encodingType, errCode
		}
	} else {
		maxkeys = maxObjectList
	}

	prefix = values.Get("prefix")
	startAfter = values.Get("start-after")
	delimiter = values.Get("delimiter")
	fetchOwner = values.Get("fetch-owner") == "true"
	encodingType = values.Get("encoding-type")

	if token = values.Get("continuation-token"); token != "" {

While there are competing ways to represent absence (`Optional`, "Null Object" pattern, method overloads),
it is unlikely that we'll be able to remove `null` entirely.

After migrating to Java 8, we can use pluggable type checkers to ensure that our annotations are consistent, 
and there are no missing null checks.

## Decision