1-- go.mod -- 2module example.com/retract 3 4go 1.12 5 6require example.com/retractdep v1.0.0 7-- go.sum -- 8example.com/retractdep v1.0.0 h1:SOVn6jA2ygQY+v8/5aAwxVUJ9teuLrdH/UmbUtp2C44= 9example.com/retractdep v1.0.0/go.mod h1:UjjWSH/ulfbAGgQQwm7pAZ988MFRngUSkJnzcuPsYDI= 10-- a.go -- 11package a 12 13import _ "example.com/retractdep"