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errors: add ErrUnsupported 

Fixes #41198

Change-Id: Ib33a11d0eb311f8e2b81de24d11df49e00b2fc81
Reviewed-on: https://go-review.googlesource.com/c/go/+/473935
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Andy Pan <panjf2000@gmail.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Andy Pan 2023-03-02 11:57:24 +08:00 committed by Gopher Robot
parent d9c29ec6a5
commit 70f98a251e
2 changed files with 16 additions and 0 deletions
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1
api/next/41198.txt Normal file
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@ -0,0 +1 @@
pkg errors, var ErrUnsupported error #41198

15
src/errors/errors.go
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@ -70,3 +70,18 @@ type errorString struct {
func (e *errorString) Error() string { func (e *errorString) Error() string {
return e.s return e.s
} }
// ErrUnsupported indicates that a requested operation cannot be performed,
// because it is unsupported. For example, a call to os.Link when using a
// file system that does not support hard links.
//
// Functions and methods should not return this error but should instead
// return an error including appropriate context that satisfies
//
// errors.Is(err, errors.ErrUnsupported)
//
// either by directly wrapping ErrUnsupported or by implementing an Is method.
//
// Functions and methods should document the cases in which an error
// wrapping this will be returned.
var ErrUnsupported = New("unsupported operation")