If ArrayList subList iterator forEachRemaining() is called, lastRet is incorrectly set to cursor, not to cursor - 1 as in another forEachRemaining call in the same source file.

Discovered by adding subList tests to ArrayListTest:

Index: src/test/tck/ArrayListTest.java
===================================================================
RCS file: /export/home/jsr166/jsr166/jsr166/src/test/tck/ArrayListTest.java,v
retrieving revision 1.1
diff -u -r1.1 ArrayListTest.java
--- src/test/tck/ArrayListTest.java 17 Oct 2016 17:52:30 -0000 1.1
+++ src/test/tck/ArrayListTest.java 14 Nov 2016 21:05:16 -0000
@@ -7,6 +7,7 @@
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.List;
 
 import junit.framework.Test;
 import junit.framework.TestSuite;
@@ -19,13 +20,20 @@
     public static Test suite() {
         class Implementation implements CollectionImplementation {
             public Class<?> klazz() { return ArrayList.class; }
- public Collection emptyCollection() { return new ArrayList(); }
+ public List emptyCollection() { return new ArrayList(); }
             public Object makeElement(int i) { return i; }
             public boolean isConcurrent() { return false; }
             public boolean permitsNulls() { return true; }
         }
- return newTestSuite(// ArrayListTest.class,
- CollectionTest.testSuite(new Implementation()));
+ class SubListImplementation extends Implementation {
+ public List emptyCollection() {
+ return super.emptyCollection().subList(0, 0);
+ }
+ }
+ return newTestSuite(
+ // ArrayListTest.class,
+ CollectionTest.testSuite(new Implementation()),
+ CollectionTest.testSuite(new SubListImplementation()));
     }
 
 }

giving:

     [java] 1) testRemoveAfterForEachRemaining(Collection8Test)java.util.ConcurrentModificationException
     [java] at java.base/java.util.ArrayList$SubList$1.remove(ArrayList.java:1233)
     [java] at Collection8Test.testRemoveAfterForEachRemaining(Collection8Test.java:403)
     [java] at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
     [java] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     [java] at JSR166TestCase.runTest(JSR166TestCase.java:303)
     [java] at JSR166TestCase.runBare(JSR166TestCase.java:294)
     [java] at JSR166TestCase.main(JSR166TestCase.java:367)
     [java] at ArrayListTest.main(ArrayListTest.java:17)