When using golang.org/x/mod/modfile.Parse() to parse a go.mod file into file File, I expect file.Module.Mod to have both Path and Version set. Instead, only Path is set - including the version as last element.

The go.mod contained this line: module github.com/onsi/ginkgo/v2 (the exact package being not important), running in dlv I confirmed the behavior:

(dlv) p file.Module.Mod
golang.org/x/mod/module.Version {
	Path: "github.com/onsi/ginkgo/v2",
	Version: "",}

I used file, err := modfile.Parse(fmt.Sprintf("go.mod@%v", version), fileContents, nil) to parse the file, no error was returned. The filename given as argument should be irrelevant to this problem.

Please either change the code to have Path and Version set or document this is not the case and what users should do instead.

go version go1.17.5 linux/amd64
golang.org/x/mod version v0.5.1