env GO111MODULE=on

# initial standalone module should use no downloaded modules
go list -deps -f {{.Dir}}
! stdout 'pkg[\\/]mod'

# v2 import should use a downloaded module
# both without an explicit go.mod entry ...
cp tmp/use_v2.go x.go
go get .
go list -deps -f {{.Dir}}
stdout 'pkg[\\/]mod[\\/]rsc.io[\\/]quote[\\/][email protected]$'

# ... and with one ...
cp tmp/use_v2.mod go.mod
go list -deps -f {{.Dir}}
stdout 'pkg[\\/]mod[\\/]rsc.io[\\/]quote[\\/][email protected]$'

# ... and even if there is a v2 module in a subdirectory.
mkdir v2
cp x.go v2/x.go
cp tmp/v2.mod v2/go.mod
go list -deps -f {{.Dir}}
stdout 'pkg[\\/]mod[\\/]rsc.io[\\/]quote[\\/][email protected]$'

-- go.mod --
module rsc.io/quote

-- x.go --
package quote

-- tmp/use_v2.go --
package quote
import _ "rsc.io/quote/v2"

-- tmp/use_v2.mod --
module rsc.io/quote
require rsc.io/quote/v2 v2.0.1

-- tmp/v2.mod --
package rsc.io/quote/v2