case *types.Chan, *types.Map, *types.Signature, *types.Slice:
		return false
	case *types.Pointer:
		return typeOKForCgoCall(t.Elem(), m)
	case *types.Array:
		return typeOKForCgoCall(t.Elem(), m)
	case *types.Struct:
		for i := 0; i < t.NumFields(); i++ {
			if !typeOKForCgoCall(t.Field(i).Type(), m) {
				return false
			}
		}
	}
	return true
}