gotcha, thank you

On Sunday, February 5, 2017 at 8:27:11 PM UTC+1, Matthew Butterick wrote:
>
>
> On Feb 5, 2017, at 11:05 AM, Greg Trzeciak <[email protected] 
> <javascript:>> wrote:
>
> Am I missing something simple? Can you replicate it on your machines?
>
>
> Yes, you're missing a binding for `empty?`, which is part of `#lang 
> racket` but not `#lang pollen`. If you import `racket/list` (or use `null?` 
> instead of `empty?`) then the function will work.
>
> You're not seeing an error because Pollen handles undefined identifiers by 
> making them into tag functions. Hence `(empty? tx-elements)` becomes 
> '(empty? tx-elements) and always evaluates to true.
>

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