context: listen on localhost in example

Listening on ":0" triggers a Mac firewall box while the test runs.

Change-Id: Ie6f8eb07eb76ea222f43bc40b1c30645294bc239
Reviewed-on: https://go-review.googlesource.com/c/go/+/625975
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>

diff --git a/src/context/example_test.go b/src/context/example_test.go
index 03333b5ccae9599eb2d0cd179312d32830081e9b..b597b09f16e5256679cdef9261928d29544bba6a 100644 (file)
--- a/src/context/example_test.go
+++ b/src/context/example_test.go
@@ -205,7 +205,7 @@ func ExampleAfterFunc_connection() {
                return n, err
        }
 
-       listener, err := net.Listen("tcp", ":0")
+       listener, err := net.Listen("tcp", "localhost:0")
        if err != nil {
                fmt.Println(err)
                return