parseBuildString doesn't crash on files with hash lines.

--
PiperOrigin-RevId: 148042501
MOS_MIGRATED_REVID=148042501
diff --git a/src/test/java/com/google/devtools/build/lib/syntax/SkylarkEvaluationTest.java b/src/test/java/com/google/devtools/build/lib/syntax/SkylarkEvaluationTest.java
index c2d6024..0a701e0 100644
--- a/src/test/java/com/google/devtools/build/lib/syntax/SkylarkEvaluationTest.java
+++ b/src/test/java/com/google/devtools/build/lib/syntax/SkylarkEvaluationTest.java
@@ -421,7 +421,7 @@
         "      xs.append(4)",
         "  return ys"
         // No file name in message, due to how test is set up.
-        ).testIfErrorContains("Object locked at the following location(s): 4:3, 5:5", "foo()");
+        ).testIfErrorContains("Object locked at the following location(s): :4:3, :5:5", "foo()");
   }
 
   @Test