if pkg, ok := p.pkgCache[off]; ok {
		return pkg
	}
	path := p.stringAt(off)
	errorf("missing package %q in %q", path, p.ipath)
	return nil
}

func (p *iimporter) typAt(off uint64, base *types.Named) types.Type {
	if t, ok := p.typCache[off]; ok && canReuse(base, t) {
		return t
	}

	if off < predeclReserved {
		errorf("predeclared type missing from cache: %v", off)
	}