log: add example

Fixes #6028.

R=golang-dev, bradfitz, adg, r
CC=golang-dev
https://golang.org/cl/43320043

diff --git a/src/pkg/log/example_test.go b/src/pkg/log/example_test.go
new file mode 100644 (file)
index 0000000..09d1a2f
--- /dev/null
+++ b/src/pkg/log/example_test.go
@@ -0,0 +1,21 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package log_test
+
+import (
+       "bytes"
+       "fmt"
+       "log"
+)
+
+func ExampleLogger() {
+       var buf bytes.Buffer
+       logger := log.New(&buf, "logger: ", log.Lshortfile)
+       logger.Print("Hello, log file!")
+
+       fmt.Print(&buf)
+       // Output:
+       // logger: example_test.go:15: Hello, log file!
+}