From 78f6856ddf855a457bd33af27089cb3f6e1b2a2d Mon Sep 17 00:00:00 2001 From: Andrew Bonventre Date: Mon, 26 Aug 2019 01:25:41 +0000 Subject: [PATCH] Revert "errors: add example showing a custom error with Unwrap" This reverts commit 739123c3a36f30af06c294741f74a26e54ee21ad. Reason for revert: broke Windows and Plan 9 builders Fixes #33828 Change-Id: I1d85c81549b1b34924fdd0ade8bf9406e5cf6555 Reviewed-on: https://go-review.googlesource.com/c/go/+/191742 Run-TryBot: Andrew Bonventre TryBot-Result: Gobot Gobot Reviewed-by: Jonathan Amsterdam --- src/errors/example_unwrap_test.go | 56 ------------------------------- 1 file changed, 56 deletions(-) delete mode 100644 src/errors/example_unwrap_test.go diff --git a/src/errors/example_unwrap_test.go b/src/errors/example_unwrap_test.go deleted file mode 100644 index 05c9cd466f..0000000000 --- a/src/errors/example_unwrap_test.go +++ /dev/null @@ -1,56 +0,0 @@ -// Copyright 2019 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package errors_test - -import ( - "errors" - "fmt" - "os" - "time" -) - -// MyError2 is an error implementation that includes a time, a message, and an -// underlying error. -type MyError2 struct { - When time.Time - What string - err error -} - -func (e MyError2) Error() string { - return fmt.Sprintf("%v at %v: %v", e.What, e.When, e.err) -} - -// Unwrap returns e's underlying error, or nil if there is none. -func (e MyError2) Unwrap() error { - return e.err -} - -func readConfig() error { - if _, err := os.Open("non-existing"); err != nil { - return MyError2{ - time.Date(1989, 3, 15, 22, 30, 0, 0, time.UTC), - "reading config file", - err, - } - } - return nil -} - -func Example_unwrap() { - if err := readConfig(); err != nil { - // Display the error. - fmt.Println(err) - // If we can retrieve the path, try to recover - // by taking another action. - var pe *os.PathError - if errors.As(err, &pe) { - restoreFile(pe.Path) - } - } - // Output: reading config file at 1989-03-15 22:30:00 +0000 UTC: open non-existing: no such file or directory -} - -func restoreFile(path string) {} -- 2.50.0