fix: reserved field inside group blocks fail parsing (#2058)

* fix: reserved field inside group blocks fail parsing

* Add test case from issue

---------

Co-authored-by: Mike Kruskal <[email protected]>

Author: jonathan-ioffe

src/parse.js

@@ -523,6 +523,10 @@ function parse(source, root, options) {
                     parseEnum(type, token);
                     break;
 
+                case "reserved":
+                    readRanges(type.reserved || (type.reserved = []), true);
+                    break;
+
                 /* istanbul ignore next */
                 default:
                     throw illegal(token); // there are no groups with proto3 semantics

tests/data/uncommon.proto

@@ -93,3 +93,11 @@ service Test6 { option (custom).bar = "";
     rpc DoSomethingElse(   stream DoSomethingRequest  ) returns (DoSomethingResponse); /// post
     rpc DoSomethingEntirelyDifferent(DoSomethingRequest  ) returns (   stream DoSomethingResponse ); /// post
 };
+
+message Test7 {
+  repeated group RepeatedGroup = 1 {
+    optional string id = 2;
+    reserved 3;
+    optional string info = 4;
+  }
+}