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vendor/google.golang.org/protobuf/proto/decode.go

@@ -8,6 +8,7 @@ import (
 	"google.golang.org/protobuf/encoding/protowire"
 	"google.golang.org/protobuf/internal/encoding/messageset"
 	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/flags"
 	"google.golang.org/protobuf/internal/genid"
 	"google.golang.org/protobuf/internal/pragma"
 	"google.golang.org/protobuf/reflect/protoreflect"
@@ -46,12 +47,6 @@ type UnmarshalOptions struct {
 	// RecursionLimit limits how deeply messages may be nested.
 	// If zero, a default limit is applied.
 	RecursionLimit int
-
-	//
-	// NoLazyDecoding turns off lazy decoding, which otherwise is enabled by
-	// default. Lazy decoding only affects submessages (annotated with [lazy =
-	// true] in the .proto file) within messages that use the Opaque API.
-	NoLazyDecoding bool
 }
 
 // Unmarshal parses the wire-format message in b and places the result in m.
@@ -109,16 +104,6 @@ func (o UnmarshalOptions) unmarshal(b []byte, m protoreflect.Message) (out proto
 		if o.DiscardUnknown {
 			in.Flags |= protoiface.UnmarshalDiscardUnknown
 		}
-
-		if !allowPartial {
-			// This does not affect how current unmarshal functions work, it just allows them
-			// to record this for lazy the decoding case.
-			in.Flags |= protoiface.UnmarshalCheckRequired
-		}
-		if o.NoLazyDecoding {
-			in.Flags |= protoiface.UnmarshalNoLazyDecoding
-		}
-
 		out, err = methods.Unmarshal(in)
 	} else {
 		o.RecursionLimit--
@@ -171,6 +156,10 @@ func (o UnmarshalOptions) unmarshalMessageSlow(b []byte, m protoreflect.Message)
 		var err error
 		if fd == nil {
 			err = errUnknown
+		} else if flags.ProtoLegacy {
+			if fd.IsWeak() && fd.Message().IsPlaceholder() {
+				err = errUnknown // weak referent is not linked in
+			}
 		}
 
 		// Parse the field value.