This PR extends the proto3 parser to support parsing message extensions. Message extensions that are parsed are discarded for now (theres no way to represent message extensions in the current AST), but the parser will no longer produce a parse error "expecting enum" when extend is encountered.
This PR extends the proto3 parser to support parsing message extensions. Message extensions that are parsed are discarded for now (theres no way to represent message extensions in the current AST), but the parser will no longer produce a parse error "expecting enum" when
extendis encountered.