Global cleanup change.

--
PiperOrigin-RevId: 145473478
MOS_MIGRATED_REVID=145473478
diff --git a/src/main/java/com/google/devtools/build/lib/packages/GlobCache.java b/src/main/java/com/google/devtools/build/lib/packages/GlobCache.java
index 56df73c..aecf43f 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/GlobCache.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/GlobCache.java
@@ -238,7 +238,8 @@
     // block on an individual pattern's results, but the other globs can
     // continue in the background.
     for (String pattern : Iterables.concat(includes, excludes)) {
-      getGlobUnsortedAsync(pattern, excludeDirs);
+      @SuppressWarnings("unused") 
+      Future<?> possiblyIgnoredError = getGlobUnsortedAsync(pattern, excludeDirs);
     }
 
     HashSet<String> results = new HashSet<>();