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| author | Jonathan Amsterdam <jba@google.com> | 2020-04-12 10:00:27 -0400 |
|---|---|---|
| committer | Jonathan Amsterdam <jba@google.com> | 2020-04-13 20:04:56 +0000 |
| commit | 7b5303d08a1b589708d6bad3d7015d9856273aac (patch) | |
| tree | 354e1228527532832e30a65f04f20158999b669c /src/errors | |
| parent | 82fcf749bde1aae839ce520edfff04d2daf70987 (diff) | |
| download | go-7b5303d08a1b589708d6bad3d7015d9856273aac.tar.gz go-7b5303d08a1b589708d6bad3d7015d9856273aac.zip | |
errors: add example for Is
Add ExampleIs to illustrate how errors.Is works.
Updates #31716.
Updates #38369.
Change-Id: I1b9a6667614635aa3a5ed8b2c108d8eb6f35748b
Reviewed-on: https://go-review.googlesource.com/c/go/+/228038
Reviewed-by: Damien Neil <dneil@google.com>
Diffstat (limited to 'src/errors')
| -rw-r--r-- | src/errors/wrap_test.go | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/errors/wrap_test.go b/src/errors/wrap_test.go index 590c1857e3..4a4a732c9b 100644 --- a/src/errors/wrap_test.go +++ b/src/errors/wrap_test.go @@ -238,6 +238,19 @@ func (errorUncomparable) Is(target error) bool { return ok } +func ExampleIs() { + if _, err := os.Open("non-existing"); err != nil { + if errors.Is(err, os.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 *os.PathError |