A drive-by find (kudos to IntelliJ IDEA):

diff --git a/src/jdk.compiler/share/classes/com/sun/tools/javac/file/JavacFileManager.java b/src/jdk.compiler/share/classes/com/sun/tools/javac/file/JavacFileManager.java
index c7b95b80437..46e93f5365c 100644
--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/file/JavacFileManager.java
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/file/JavacFileManager.java
@@ -1106,7 +1106,7 @@ public class JavacFileManager extends BaseFileManager implements StandardJavaFil
           PathAndContainer that = (PathAndContainer) o;
           return path.equals(that.path)
               && container.equals(that.container)
- && index == this.index;
+ && index == that.index;
         }