No doubt. Things with optional arguments, keyword arguments, all sorts of contraptions like that. That's why we've studiously avoided such things. Still, there

No doubt. Things with optional arguments, keyword arguments, all sorts of contraptions like that. That's why we've studiously avoided such things. Still, there's an asymmetry, at least to our minds, between calls and returns, so the argument put forth for multiple values ("a function can take multiple arguments, why can't it return multiple answers?" -- made especially compelling in a CPS context, because returns turn into calls) doesn't quite play out in practice. Ergo, no multiple return values.