errors: move example functions into example_test file

Change-Id: Ide70476698d82a51881802dd6bf05dd7abcd60e8
GitHub-Last-Rev: ddb251ded669d3dbbb96a05f4df7151c8d7c16d2
GitHub-Pull-Request: golang/go#57931
Reviewed-on: https://go-review.googlesource.com/c/go/+/462292
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>

1 files changed, 0 insertions, 37 deletions

diff --git a/src/errors/wrap_test.go b/src/errors/wrap_test.go
index 9efbe45ee0..ca9dc0f111 100644
--- a/src/errors/wrap_test.go
+++ b/src/errors/wrap_test.go
@@ -288,40 +288,3 @@ func (errorUncomparable) Is(target error) bool {
 	_, ok := target.(errorUncomparable)
 	return ok
 }
-
-func ExampleIs() {
-	if _, err := os.Open("non-existing"); err != nil {
-		if errors.Is(err, fs.ErrNotExist) {
-			fmt.Println("file does not exist")
-		} else {
-			fmt.Println(err)
-		}
-	}
-
-	// Output:
-	// file does not exist
-}
-
-func ExampleAs() {
-	if _, err := os.Open("non-existing"); err != nil {
-		var pathError *fs.PathError
-		if errors.As(err, &pathError) {
-			fmt.Println("Failed at path:", pathError.Path)
-		} else {
-			fmt.Println(err)
-		}
-	}
-
-	// Output:
-	// Failed at path: non-existing
-}
-
-func ExampleUnwrap() {
-	err1 := errors.New("error1")
-	err2 := fmt.Errorf("error2: [%w]", err1)
-	fmt.Println(err2)
-	fmt.Println(errors.Unwrap(err2))
-	// Output
-	// error2: [error1]
-	// error1
-}