add a simple check to warn people who type "=+" when they probably meant
"+=".


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55131 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/exprs.c b/test/Sema/exprs.c
index fc506f7..c98a7ed 100644
--- a/test/Sema/exprs.c
+++ b/test/Sema/exprs.c
@@ -15,3 +15,12 @@
   (__extension__ x) = 10;
 }
 
+// rdar://6162726
+void test4() {
+      static int var;
+      var =+ 5;  // expected-warning {{use of unary operator that may be intended as compound assignment (+=)}}
+      var =- 5;  // expected-warning {{use of unary operator that may be intended as compound assignment (-=)}}
+      var = +5;
+      var = -5;
+}
+