From 98263a7de64269898a2f81207e38943b5c8e8653 Mon Sep 17 00:00:00 2001
From: Tobi Smethurst <31960611+tsmethurst@users.noreply.github.com>
Date: Thu, 12 Aug 2021 21:03:24 +0200
Subject: Grand test fixup (#138)

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig
---
 .../github.com/go-errors/errors/error_backward.go  | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 vendor/github.com/go-errors/errors/error_backward.go

(limited to 'vendor/github.com/go-errors/errors/error_backward.go')

diff --git a/vendor/github.com/go-errors/errors/error_backward.go b/vendor/github.com/go-errors/errors/error_backward.go
new file mode 100644
index 000000000..80b0695e7
--- /dev/null
+++ b/vendor/github.com/go-errors/errors/error_backward.go
@@ -0,0 +1,57 @@
+// +build !go1.13
+
+package errors
+
+import (
+	"reflect"
+)
+
+type unwrapper interface {
+	Unwrap() error
+}
+
+// As assigns error or any wrapped error to the value target points
+// to. If there is no value of the target type of target As returns
+// false.
+func As(err error, target interface{}) bool {
+	targetType := reflect.TypeOf(target)
+
+	for {
+		errType := reflect.TypeOf(err)
+
+		if errType == nil {
+			return false
+		}
+
+		if reflect.PtrTo(errType) == targetType {
+			reflect.ValueOf(target).Elem().Set(reflect.ValueOf(err))
+			return true
+		}
+
+		wrapped, ok := err.(unwrapper)
+		if ok {
+			err = wrapped.Unwrap()
+		} else {
+			return false
+		}
+	}
+}
+
+// Is detects whether the error is equal to a given error. Errors
+// are considered equal by this function if they are the same object,
+// or if they both contain the same error inside an errors.Error.
+func Is(e error, original error) bool {
+	if e == original {
+		return true
+	}
+
+	if e, ok := e.(*Error); ok {
+		return Is(e.Err, original)
+	}
+
+	if original, ok := original.(*Error); ok {
+		return Is(e, original.Err)
+	}
+
+	return false
+}
-- 
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