From dfef622df20ba24082fe220c96ba3219fa0924b0 Mon Sep 17 00:00:00 2001
From: Tom Wilkie <tom.wilkie@gmail.com>
Date: Sun, 12 Mar 2017 13:33:26 +0000
Subject: [PATCH] Make sure you close files after opening them.

---
 analysis.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/analysis.go b/analysis.go
index ad0b81a234..9a071c91f5 100644
--- a/analysis.go
+++ b/analysis.go
@@ -112,13 +112,15 @@ func ListPackages(fileRoot, importRoot string) (PackageTree, error) {
 		// would have an err with the same path as is called this time, as only
 		// then will filepath.Walk have attempted to descend into the directory
 		// and encountered an error.
-		_, err = os.Open(wp)
+		var f *os.File
+		f, err = os.Open(wp)
 		if err != nil {
 			if os.IsPermission(err) {
 				return filepath.SkipDir
 			}
 			return err
 		}
+		defer f.Close()
 
 		// Compute the import path. Run the result through ToSlash(), so that
 		// windows file paths are normalized to slashes, as is expected of