reflect/prototype: default proto file syntax is "proto2"
protoc leaves FileDescriptorProto.Syntax unset when the syntax is
"proto2".
Change-Id: Id1370145fc9c5c67344f5a998d118fd0f9f65f24
Reviewed-on: https://go-review.googlesource.com/133636
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
diff --git a/reflect/prototype/protofile_desc.go b/reflect/prototype/protofile_desc.go
index 39331db..466e53e 100644
--- a/reflect/prototype/protofile_desc.go
+++ b/reflect/prototype/protofile_desc.go
@@ -55,7 +55,7 @@
func NewFileFromDescriptorProto(fd *descriptorV1.FileDescriptorProto, r *protoregistry.Files) (protoreflect.FileDescriptor, error) {
var f File
switch fd.GetSyntax() {
- case "proto2":
+ case "", "proto2":
f.Syntax = protoreflect.Proto2
case "proto3":
f.Syntax = protoreflect.Proto3
