adapt to changing Pair API again

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/proxy/branches/version-2.0-work@1091492 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/stub/src/main/java/org/apache/commons/proxy2/stub/StubInterceptor.java b/stub/src/main/java/org/apache/commons/proxy2/stub/StubInterceptor.java
index f0560dc..4f30cb7 100644
--- a/stub/src/main/java/org/apache/commons/proxy2/stub/StubInterceptor.java
+++ b/stub/src/main/java/org/apache/commons/proxy2/stub/StubInterceptor.java
@@ -118,8 +118,8 @@
                 }
             } else {
                 for (Pair<InvocationMatcher, ? extends Result> pair : matchingResultStack) {
-                    if (pair.getLeftElement().matches(invocation)) {
-                        return pair.getRightElement().getResult();
+                    if (pair.getLeft().matches(invocation)) {
+                        return pair.getRight().getResult();
                     }
                 }
             }