os: add example for IsNotExist

Show usage of os.IsNotExist in an example.

Change-Id: I5306ea06c370099de5b02668dfa02b87b0c2beac
Reviewed-on: https://go-review.googlesource.com/25571
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

diff --git a/src/os/example_test.go b/src/os/example_test.go
index a28255254b4cde0dae6762e5ce30c1e7820b58db..9c890c451973cee8b65e0f3194f58bdea1e701e9 100644 (file)
--- a/src/os/example_test.go
+++ b/src/os/example_test.go
@@ -52,3 +52,12 @@ func ExampleFileMode() {
                fmt.Println("named pipe")
        }
 }
+
+func ExampleIsNotExist() {
+       filename := "a-nonexistent-file"
+       if _, err := os.Stat(filename); os.IsNotExist(err) {
+               fmt.Printf("file does not exist")
+       }
+       // Output:
+       // file does not exist
+}