golang.org/x/tools/go/packages.Module.GoMod (field)

one use

	golang.org/x/tools/go/packages (current package)
		packages.go#L393: 	GoMod     string       // path to go.mod file used when loading this module, if any

The pages are generated with Golds v0.4.9. (GOOS=linux GOARCH=amd64)