Module example.com/retract/rename is renamed in this version.

This happens frequently when a repository is renamed or when a go.mod file
is added for the first time with a custom module path.
-- .info --
{"Version":"v1.9.0-new"}
-- .mod --
module example.com/retract/newname

go 1.16

// bad
retract v1.0.0-bad
-- go.mod --
module example.com/retract/newname

go 1.16

// bad
retract v1.0.0-bad
-- newname.go --
package newname