1syntax = "proto3"; 2package merge; 3 4import "github.com/gogo/protobuf/gogoproto/gogo.proto"; 5 6message A { 7 B B = 1 [(gogoproto.nullable) = false]; 8 repeated C c = 2 [(gogoproto.nullable) = false]; 9} 10 11message B { 12 int64 c = 1; 13} 14 15message C { 16 int64 d = 1; 17}