os: change example to avoid deprecated function

eliben · ianlancetaylor · commit 0fa3265fe14c · 2021-06-30T16:44:19.000Z
The IsNotExist function is deprecated; change package example to avoid it and use the recommended way instead. Fixes #46976 Change-Id: I3c301d0a89b6bda42184df314ba8418062ca39ee Reviewed-on: https://go-review.googlesource.com/c/go/+/331692 Trust: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
diff --git a/src/os/example_test.go b/src/os/example_test.go
@@ -5,6 +5,7 @@
 package os_test
 
 import (
+	"errors"
 	"fmt"
 	"io/fs"
 	"log"
@@ -71,9 +72,9 @@ func ExampleFileMode() {
 	}
 }
 
-func ExampleIsNotExist() {
+func ExampleErrNotExist() {
 	filename := "a-nonexistent-file"
-	if _, err := os.Stat(filename); os.IsNotExist(err) {
+	if _, err := os.Stat(filename); errors.Is(err, fs.ErrNotExist) {
 		fmt.Println("file does not exist")
 	}
 	// Output:

Original file line number	Diff line number	Diff line change
`@@ -5,6 +5,7 @@`
`5`	`5`	`package os_test`
`6`	`6`
`7`	`7`	`import (`
	`8`	`+ "errors"`
`8`	`9`	`"fmt"`
`9`	`10`	`"io/fs"`
`10`	`11`	`"log"`
`@@ -71,9 +72,9 @@ func ExampleFileMode() {`
`71`	`72`	`}`
`72`	`73`	`}`
`73`	`74`
`74`		`-func ExampleIsNotExist() {`
	`75`	`+func ExampleErrNotExist() {`
`75`	`76`	`filename := "a-nonexistent-file"`
`76`		`- if _, err := os.Stat(filename); os.IsNotExist(err) {`
	`77`	`+ if _, err := os.Stat(filename); errors.Is(err, fs.ErrNotExist) {`
`77`	`78`	`fmt.Println("file does not exist")`
`78`	`79`	`}`
`79`	`80`	`// Output:`