That makes perfect sense, thank you.

On Tuesday, February 6, 2018 at 12:43:07 AM UTC+1, Sam Tobin-Hochstadt 

> The problem is that the definition of `(Dual-Number N)` includes `N`, 
> and therefore 
> (Dual-Number (Dual-Number String)) might either be a (D (D "x" "y") (D 
> "x" "y")) or just (D "x" "y"). Therefore checking D? can't tell that 
> you're in the `D` case because both cases could be a `D` case. 
> Sam 

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