1*d4726bddSHONG Yifansyntax = "proto3"; 2*d4726bddSHONG Yifan 3*d4726bddSHONG Yifanimport "a.proto"; 4*d4726bddSHONG Yifan 5*d4726bddSHONG Yifanmessage B { 6*d4726bddSHONG Yifan A a = 1; 7*d4726bddSHONG Yifan}