return error if ParsedURL is nil in unix resolver

internal/resolver/unix/unix.go

@@ -43,12 +43,12 @@ func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, _ resolv
 	// resolver implementations we ended up stripping the leading "/" from the
 	// endpoint. This obviously does not work for the "unix" scheme. Hence we
 	// end up using the parsed URL instead.
-	endpoint := target.Endpoint
-	if u := target.ParsedURL; u != nil {
-		endpoint = u.Path
-		if endpoint == "" {
-			endpoint = u.Opaque
-		}
+	if target.ParsedURL == nil {
+		return nil, fmt.Errorf("nil ParsedURL in received target: %+v", target)
+	}
+	endpoint := target.ParsedURL.Path
+	if endpoint == "" {
+		endpoint = target.ParsedURL.Opaque
 	}
 	addr := resolver.Address{Addr: endpoint}
 	if b.scheme == unixAbstractScheme {

resolver/resolver.go

@@ -227,7 +227,7 @@ type Target struct {
 	Authority string
 	Endpoint  string
 	// ParsedURL contains the parsed dial target with an optional default scheme
-	// added to it if the original dial target contained no scheme or containted
+	// added to it if the original dial target contained no scheme or contained
 	// an unregistered scheme. Any query params specified in the original dial
 	// target can be accessed from here.
 	ParsedURL *url.URL