filter reserved_numbers and reserved_names tuples when converting from gpb representation

lib/exprotobuf/parser.ex

@@ -18,10 +18,16 @@ defmodule Protobuf.Parser do
     |> finalize!(options)
   end
 
+  ## filter information about reserved numbers/names,
+  ## as they are useless in this context
+  defp filter_reserved({{:reserved_names, _}, _}), do: false
+  defp filter_reserved({{:reserved_numbers, _}, _}), do: false
+  defp filter_reserved(_), do: true
+
   defp finalize!(defs, options) do
     case :gpb_parse.post_process_all_files(defs, options) do
       {:ok, defs} ->
-        defs
+        defs |> Enum.filter(&filter_reserved/1)
 
       {:error, error} ->
         msg =

test/protobuf_test.exs

@@ -1,6 +1,34 @@
 defmodule ProtobufTest do
   use Protobuf.Case
 
+  test "can handle reserved fields" do
+    defmodule ReservedProto3 do
+        use Protobuf, """
+        syntax = "proto3";
+
+        message Foo {
+            reserved 2, 15, 9 to 11;
+            reserved "foo", "bar";
+            string f1 = 1;
+        }
+        """
+    end
+
+    defmodule ReservedProto2 do
+        use Protobuf, """
+        message Foo {
+            reserved 2, 15, 9 to 11;
+            reserved "foo", "bar";
+            string f1 = 1;
+        }
+        """
+    end
+
+    # just the compilation pass should suffice as a test itself
+    _ = ReservedProto3.Foo.new(f1: "test")
+    _ = ReservedProto2.Foo.new(f1: "test")
+  end
+
   test "can roundtrip encoding/decoding optional values in proto2" do
     defmodule RoundtripProto2 do
       use Protobuf, """