Custom Option Type map fails to parse about go-protoparser

[yoheimuta]

@hfjn That's nearly right!
This parser conforms to the spec like enumValueOption = optionName "=" constant.

So that, the part around "{field_number: 101}" should be fullIdent | ( [ "-" | "+" ] intLit ) | ( [ "-" | "+" ] floatLit ) | strLit | boolLit.

[yoheimuta]

To sum up, you can fix a line like below.

- REQUEST = 1 [(event_additional_data) = {field_number: 101}];
+ REQUEST = 1 [(event_additional_data) = "{field_number: 101}"];

[memo] This parser extends a rule regarding a field option beyond the spec to parse a grpc-gateway_a_bit_of_everything.proto.