unquote file.txt
testscript -v file.txt
stdout 'example.com/mod'
! stderr .+

-- file.txt --
>go list -m
>stdout 'example.com/mod'
>go list fruit.com/...
>stdout 'fruit.com/fruit'
>stdout 'fruit.com/coretest'

>-- go.mod --
>module example.com/mod
>
>require fruit.com v1.0.0

>-- .gomodproxy/fruit.com_v1.0.0/.mod --
>module fruit.com
>
>-- .gomodproxy/fruit.com_v1.0.0/.info --
>{"Version":"v1.0.0","Time":"2018-10-22T18:45:39Z"}
>
>-- .gomodproxy/fruit.com_v1.0.0/go.mod --
>module fruit.com
>
>-- .gomodproxy/fruit.com_v1.0.0/fruit/fruit.go --
>package fruit
>
>const Apple = "apple"
>-- .gomodproxy/fruit.com_v1.0.0/coretest/coretest.go --
>// package coretest becomes a candidate for the missing
>// core import in main above
>package coretest
>
>const Mandarin = "mandarin"
