path=example.com/m
version=v1.0.0
wantErr=go.mod file not in module root directory
-- example.com/m@v1.0.0/a.go --
package a
-- example.com/m@v1.0.0/b/GO.MOD --
MODULE EXAMPLE.COM/M/B
-- example.com/m@v1.0.0/b/b.go --
package b