Fix the run line for this test.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52169 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Lexer/digraph.c b/test/Lexer/digraph.c
index 07c085a..9683ee4 100644
--- a/test/Lexer/digraph.c
+++ b/test/Lexer/digraph.c
@@ -1,4 +1,4 @@
-// RUN: clang -fsyntax-only %s
+// RUN: clang -fsyntax-only -verify < %s
 
 %:include <stdio.h>