Eagerly close directory content stream again when looking for dumped lambdas

RELNOTES: None.

PiperOrigin-RevId: 179245378
GitOrigin-RevId: dd6f8298529f05372d9c0c31eabf19f69d38b22e
Change-Id: Iaf61b5eec2bc3f050a3aada9532e8bb3d03d723f

1 files changed, 8 insertions, 6 deletions

diff --git a/java/com/google/devtools/build/android/desugar/LambdaClassMaker.java b/java/com/google/devtools/build/android/desugar/LambdaClassMaker.java
index 1f240ef..72f039a 100644
--- a/java/com/google/devtools/build/android/desugar/LambdaClassMaker.java
+++ b/java/com/google/devtools/build/android/desugar/LambdaClassMaker.java
@@ -27,6 +27,7 @@ import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Stream;
 
 class LambdaClassMaker {
 
@@ -80,11 +81,12 @@ class LambdaClassMaker {
     if (!Files.exists(rootPathPrefix.getParent())) {
       return ImmutableList.of();
     }
-    return Files.list(rootPathPrefix.getParent())
-        .filter(
-            path ->
-                path.toString().startsWith(rootPathPrefixStr)
-                    && !existingPaths.contains(path))
-        .collect(ImmutableList.toImmutableList());
+    try (Stream<Path> paths =
+        Files.list(rootPathPrefix.getParent())
+            .filter(
+                path -> path.toString().startsWith(rootPathPrefixStr)
+                    && !existingPaths.contains(path))) {
+      return paths.collect(ImmutableList.toImmutableList());
+    }
   }
 }