// be indexed.
func indexPackage(modroot, pkgdir string) []byte {
	fsys.Trace("indexPackage", pkgdir)
	p := importRaw(modroot, relPath(pkgdir, modroot))
	return encodePackageBytes(p)
}

// rawPackage holds the information from each package that's needed to
// fill a build.Package once the context is available.
type rawPackage struct {
	error string