├── main.go
└── Gopkg.toml


/main.go:
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1 | package main
2 | 
3 | import "github.com/rsc/dt1-a/A"
4 | 
5 | func main() { A.F() }
6 | 


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/Gopkg.toml:
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1 | [[constraint]]
2 |   name = "github.com/rsc/dt1-a"
3 |   version = "1.0.1"
4 | 
5 | [[constraint]]
6 |   name = "github.com/rsc/dt1-b"
7 |   version = "=1.0.0"
8 | 


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