Improve understanding post increment and decrement.

Before: (a->f()) ++;
        a[42] ++;
After:  (a->f())++;
        a[42]++;
llvm-svn: 172400
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index eb87a3b..9565e3a 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -978,6 +978,8 @@
   verifyFormat("if (i < -1) {}");
   verifyFormat("++(a->f());");
   verifyFormat("--(a->f());");
+  verifyFormat("(a->f())++;");
+  verifyFormat("a[42]++;");
   verifyFormat("if (!(a->f())) {}");
 
   verifyFormat("a-- > b;");