fix a bug handling right associative operators that Neil noticed, hopefully
the final part of PR2279

llvm-svn: 50635
diff --git a/clang/test/Preprocessor/expr_liveness.c b/clang/test/Preprocessor/expr_liveness.c
index 61c0732..da30616 100644
--- a/clang/test/Preprocessor/expr_liveness.c
+++ b/clang/test/Preprocessor/expr_liveness.c
@@ -26,6 +26,9 @@
 #error
 #endif
 
+// PR2279
+#if 1 ? 2 ? 3 : 4 : 5
+#endif
 
 #else