io: add error check to WriteString Example test

Change-Id: I9ce1c79e5799f205aec3a4dc02645ed26bdc3581
GitHub-Last-Rev: 59b637db0154e55ddfdd55e54b9596dc3a0ad32d
GitHub-Pull-Request: golang/go#44533
Reviewed-on: https://go-review.googlesource.com/c/go/+/295389
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>

diff --git a/src/io/example_test.go b/src/io/example_test.go
index 6d338acd1401354187a66f16625e443359204591..a18df9feff696510d54adc9f53d135d15f07b23e 100644 (file)
--- a/src/io/example_test.go
+++ b/src/io/example_test.go
@@ -103,7 +103,9 @@ func ExampleReadFull() {
 }
 
 func ExampleWriteString() {
-       io.WriteString(os.Stdout, "Hello World")
+       if _, err := io.WriteString(os.Stdout, "Hello World"); err != nil {
+               log.Fatal(err)
+       }
 
        // Output: Hello World
 }