errors: remove mention of Wrapper interface

The Wrapper type no longer exists.

Change-Id: I21051f26c6722a957295819f2f385f2bbd0db355
Reviewed-on: https://go-review.googlesource.com/c/go/+/177618
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/errors/wrap.go b/src/errors/wrap.go
index 62332b1a8897bff56bcceb9f328c717c6359c9c7..760a08a4ef2ba3e932a9af0ff4b2fd3e1bc7e601 100644 (file)
--- a/src/errors/wrap.go
+++ b/src/errors/wrap.go
@@ -8,8 +8,9 @@ import (
        "internal/reflectlite"
 )
 
-// Unwrap returns the result of calling the Unwrap method on err, if err
-// implements Wrapper. Otherwise, Unwrap returns nil.
+// Unwrap returns the result of calling the Unwrap method on err, if err's
+// type contains an Unwrap method returning error.
+// Otherwise, Unwrap returns nil.
 func Unwrap(err error) error {
        u, ok := err.(interface {
                Unwrap() error