Work around or suppress forthcoming nullness errors.

This CL also provides a little more progress toward #3679: One of the workarounds involves removing a call to the long-obsolete `Iterators.cast`, and I went ahead and removed the method itself, too.

RELNOTES=n/a
PiperOrigin-RevId: 584417248

android/guava/src/com/google/common/collect/Iterators.java

@@ -42,7 +42,6 @@
 import java.util.Enumeration;
 import java.util.Iterator;
 import java.util.List;
-import java.util.ListIterator;
 import java.util.NoSuchElementException;
 import java.util.PriorityQueue;
 import java.util.Queue;
@@ -1444,9 +1443,4 @@ public void remove() {
       toRemove = null;
     }
   }
-
-  /** Used to avoid http://bugs.sun.com/view_bug.do?bug_id=6558557 */
-  static <T extends @Nullable Object> ListIterator<T> cast(Iterator<T> iterator) {
-    return (ListIterator<T>) iterator;
-  }
 }

android/guava/src/com/google/common/collect/TableCollectors.java

@@ -93,7 +93,7 @@ final class TableCollectors {
           java.util.function.Function<? super T, ? extends C> columnFunction,
           java.util.function.Function<? super T, ? extends V> valueFunction,
           java.util.function.Supplier<I> tableSupplier) {
-    return toTable(
+    return TableCollectors.<T, R, C, V, I>toTable(
         rowFunction,
         columnFunction,
         valueFunction,

android/guava/src/com/google/common/collect/TransformedListIterator.java

@@ -36,7 +36,7 @@ abstract class TransformedListIterator<F extends @Nullable Object, T extends @Nu
   }
 
   private ListIterator<? extends F> backingIterator() {
-    return Iterators.cast(backingIterator);
+    return (ListIterator<? extends F>) backingIterator;
   }
 
   @Override

guava-testlib/src/com/google/common/testing/CollectorTester.java

@@ -147,6 +147,7 @@ A result(Collector<T, A, R> collector, Iterable<T> inputs) {
    */
   @SafeVarargs
   @CanIgnoreReturnValue
+  @SuppressWarnings("nullness") // TODO(cpovirk): Remove after we fix whatever the bug is.
   public final CollectorTester<T, A, R> expectCollects(R expectedResult, T... inputs) {
     List<T> list = Arrays.asList(inputs);
     doExpectCollects(expectedResult, list);

guava/src/com/google/common/collect/Iterators.java

@@ -42,7 +42,6 @@
 import java.util.Enumeration;
 import java.util.Iterator;
 import java.util.List;
-import java.util.ListIterator;
 import java.util.NoSuchElementException;
 import java.util.PriorityQueue;
 import java.util.Queue;
@@ -1444,9 +1443,4 @@ public void remove() {
       toRemove = null;
     }
   }
-
-  /** Used to avoid http://bugs.sun.com/view_bug.do?bug_id=6558557 */
-  static <T extends @Nullable Object> ListIterator<T> cast(Iterator<T> iterator) {
-    return (ListIterator<T>) iterator;
-  }
 }

guava/src/com/google/common/collect/Multimaps.java

@@ -122,7 +122,7 @@ private Multimaps() {}
           java.util.function.Function<? super T, ? extends K> keyFunction,
           java.util.function.Function<? super T, ? extends V> valueFunction,
           java.util.function.Supplier<M> multimapSupplier) {
-    return CollectCollectors.toMultimap(keyFunction, valueFunction, multimapSupplier);
+    return CollectCollectors.<T, K, V, M>toMultimap(keyFunction, valueFunction, multimapSupplier);
   }
 
   /**
@@ -167,7 +167,8 @@ private Multimaps() {}
           java.util.function.Function<? super T, ? extends K> keyFunction,
           java.util.function.Function<? super T, ? extends Stream<? extends V>> valueFunction,
           java.util.function.Supplier<M> multimapSupplier) {
-    return CollectCollectors.flatteningToMultimap(keyFunction, valueFunction, multimapSupplier);
+    return CollectCollectors.<T, K, V, M>flatteningToMultimap(
+        keyFunction, valueFunction, multimapSupplier);
   }
 
   /**

guava/src/com/google/common/collect/TableCollectors.java

@@ -90,7 +90,7 @@ final class TableCollectors {
           java.util.function.Function<? super T, ? extends C> columnFunction,
           java.util.function.Function<? super T, ? extends V> valueFunction,
           java.util.function.Supplier<I> tableSupplier) {
-    return toTable(
+    return TableCollectors.<T, R, C, V, I>toTable(
         rowFunction,
         columnFunction,
         valueFunction,

guava/src/com/google/common/collect/Tables.java

@@ -77,7 +77,8 @@ private Tables() {}
           java.util.function.Function<? super T, ? extends C> columnFunction,
           java.util.function.Function<? super T, ? extends V> valueFunction,
           java.util.function.Supplier<I> tableSupplier) {
-    return TableCollectors.toTable(rowFunction, columnFunction, valueFunction, tableSupplier);
+    return TableCollectors.<T, R, C, V, I>toTable(
+        rowFunction, columnFunction, valueFunction, tableSupplier);
   }
 
   /**
@@ -106,7 +107,7 @@ private Tables() {}
           java.util.function.Function<? super T, ? extends V> valueFunction,
           BinaryOperator<V> mergeFunction,
           java.util.function.Supplier<I> tableSupplier) {
-    return TableCollectors.toTable(
+    return TableCollectors.<T, R, C, V, I>toTable(
         rowFunction, columnFunction, valueFunction, mergeFunction, tableSupplier);
   }
 

guava/src/com/google/common/collect/TransformedListIterator.java

@@ -36,7 +36,7 @@ abstract class TransformedListIterator<F extends @Nullable Object, T extends @Nu
   }
 
   private ListIterator<? extends F> backingIterator() {
-    return Iterators.cast(backingIterator);
+    return (ListIterator<? extends F>) backingIterator;
   }
 
   @Override