Fail even if opt doesn't print anything.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31844 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/BasicAA/modref.ll b/test/Analysis/BasicAA/modref.ll
index aaf0b03..acf439f 100644
--- a/test/Analysis/BasicAA/modref.ll
+++ b/test/Analysis/BasicAA/modref.ll
@@ -1,3 +1,6 @@
+; A very rudimentary test on AliasAnalysis::getModRefInfo.
+; RUN: llvm-as < %s | opt -print-all-alias-modref-info -aa-eval -disable-output
+&&
; RUN: llvm-as < %s | opt -print-all-alias-modref-info -aa-eval -disable-output 2>&1 | not grep NoModRef
int %callee() {