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errors: document that the target of Is must be comparable

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If target is not comparable, then errors.Is(err, target) can panic.
(Put another way, if target == target panics, then Is can panic.)

Document that the target must be comparable.

For #74488

Change-Id: I694dc4c91a608b80f044f06dd1c6ac32b8e77c9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/715440
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Damien Neil <dneil@google.com>
TryBot-Bypass: Damien Neil <dneil@google.com>
This commit is contained in:
Damien Neil 2025-10-27 12:27:12 -07:00 • committed by Gopher Robot
parent 1f4d14e493
commit 12c8d14d94
1 changed files with 1 additions and 0 deletions
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src/errors/wrap.go
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@ -25,6 +25,7 @@ func Unwrap(err error) error {
}
// Is reports whether any error in err's tree matches target.
// The target must be comparable.
//
// The tree consists of err itself, followed by the errors obtained by repeatedly
// calling its Unwrap() error or Unwrap() []error method. When err wraps multiple