e.IntAt(e.Pos(), packagesPos+8*i+4)
		encodePackage(e, p)
	}
	e.IntAt(e.Pos(), stringTableOffsetPos)
	e.Bytes(e.stringTable)
	e.Bytes([]byte{0xFF}) // end of string table marker
	return e.b
}

func encodePackageBytes(p *rawPackage) []byte {
	return encodeModuleBytes([]*rawPackage{p})
}

func encodePackage(e *encoder, p *rawPackage) {
	e.String(p.error)
	e.String(p.dir)

// 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