From 3b081dae265eca6cfcdf31868041b053c4768d1a Mon Sep 17 00:00:00 2001
From: Mark McGranaghan <mmcgrana@gmail.com>
Date: Tue, 16 Oct 2012 10:39:00 -0700
Subject: [PATCH] explain tricky err switch

---
 examples/line-filters/line-filters.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/examples/line-filters/line-filters.go b/examples/line-filters/line-filters.go
index 8cd9af5..38f60bc 100644
--- a/examples/line-filters/line-filters.go
+++ b/examples/line-filters/line-filters.go
@@ -31,9 +31,9 @@ func main() {
     for {
         switch line, err := rdr.ReadString('\n'); err {
 
-        // If the read succeeded, write out out the
-        // uppercased line. Check for an error on the
-        // write as we do on the read.
+        // If the read succeeded (the read `err` is nil),
+        // write out out the uppercased line. Check for an
+        // error on this write as we do on the read.
         case nil:
             ucl := strings.ToUpper(line)
             if _, err = out.WriteString(ucl); err != nil {