path=example.com/m@v1
version=v1.0.0
hash=h1:kfXam9weeIGbXPqzuILvA7E/rit+44dEMb1xuXLpJwE=
-- a.go --
package a
-- cue.mod/module.cue --
module: "example.com/m"
-- b/CUE.MOD/foo --
MODULE EXAMPLE.COM/M/B
-- b/b.go --
package b