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errors: clarify docs for when As returns false 

Change-Id: Ic8d8399f726c1f9376499fdae92bea41632586ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/193602
Reviewed-by: Jonathan Amsterdam <jba@google.com>
This commit is contained in:
Ian Lance Taylor 2019-09-05 13:24:26 -07:00
parent 2b6b474f64
commit c99598cbd3
1 changed files with 2 additions and 2 deletions
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4
src/errors/wrap.go
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@ -59,7 +59,7 @@ func Is(err, target error) bool {
}
// As finds the first error in err's chain that matches target, and if so, sets
// target to that error value and returns true.
// target to that error value and returns true. Otherwise, it returns false.
//
// The chain consists of err itself followed by the sequence of errors obtained by
// repeatedly calling Unwrap.
@ -73,7 +73,7 @@ func Is(err, target error) bool {
// a different error type.
//
// As panics if target is not a non-nil pointer to either a type that implements
// error, or to any interface type. As returns false if err is nil.
// error, or to any interface type.
func As(err error, target interface{}) bool {
if target == nil {
panic("errors: target cannot be nil")