1example.com/cmd contains main packages. 2 3-- .info -- 4{"Version":"v1.0.0-exclude"} 5-- .mod -- 6module example.com/cmd 7 8go 1.16 9 10exclude rsc.io/quote v1.5.2 11-- go.mod -- 12module example.com/cmd 13 14go 1.16 15 16exclude rsc.io/quote v1.5.2 17-- a/a.go -- 18package main 19 20func main() {} 21-- b/b.go -- 22package main 23 24func main() {} 25-- err/err.go -- 26package err 27 28var X = DoesNotCompile