From 0fa3265fe14c775668fc8272f47adf4fbaa60bac Mon Sep 17 00:00:00 2001
From: Eli Bendersky <eliben@golang.org>
Date: Tue, 29 Jun 2021 16:31:18 -0700
Subject: [PATCH] os: change example to avoid deprecated function

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>
---
 src/os/example_test.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/os/example_test.go b/src/os/example_test.go
index 3adce517848..e8554b0b122 100644
--- 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: