path=example.com/m
version=v1.0.0
hash=h1:XduFAgX/GaspZa8Jv4pfzoGEzNaU/r88PiCunijw5ok=
-- go.mod --
module example.com/m

go 1.13
-- sub/go.mod --
module example.com/m/sub
-- sub/x.go' --
invalid name, but this shouldn't be read