r.dict = dict

		typ = r.doTyp()
		assert(typ != nil)
		pr.retireReader(r)
	}
	// See comment in pkgReader.typIdx explaining how this happens.
	if prev := *where; prev != nil {
		return prev
	}

	*where = typ
	return typ
}

func (r *reader) doTyp() (res types.Type) {
	switch tag := pkgbits.CodeType(r.Code(pkgbits.SyncType)); tag {
	default: