1 // Copyright (c) 2017-2023 Uber Technologies, Inc.
2 //
3 // Permission is hereby granted, free of charge, to any person obtaining a copy
4 // of this software and associated documentation files (the "Software"), to deal
5 // in the Software without restriction, including without limitation the rights
6 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 // copies of the Software, and to permit persons to whom the Software is
8 // furnished to do so, subject to the following conditions:
9 //
10 // The above copyright notice and this permission notice shall be included in
11 // all copies or substantial portions of the Software.
12 //
13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19 // THE SOFTWARE.
20 21 //go:build go1.20
22 // +build go1.20
23 24 package multierr
25 26 // Unwrap returns a list of errors wrapped by this multierr.
27 func (merr *multiError) Unwrap() []error {
28 return merr.Errors()
29 }
30 31 type multipleErrors interface {
32 Unwrap() []error
33 }
34 35 func extractErrors(err error) []error {
36 if err == nil {
37 return nil
38 }
39 40 // check if the given err is an Unwrapable error that
41 // implements multipleErrors interface.
42 eg, ok := err.(multipleErrors)
43 if !ok {
44 return []error{err}
45 }
46 47 return append(([]error)(nil), eg.Unwrap()...)
48 }
49