[racket] Run-time record access

Currently, the run-time representation of a struct doesn't include
field names. In that sense, field names don't exist at run time, and
all fields are accessed by position.

We plan to change the structure-type core to add field names, but it
hasn't happened, yet.

At Wed, 10 Dec 2014 04:36:50 -0500, Benjamin Greenman wrote:
> I'm hoping to implement the following function to access arbitrary struct
> fields.
> 
> ;; Compute `[st]-field-name st`, where
> ;; [st] is the name of the struct type of `st`
> (define (runtime-get st field-name)
>   (-> struct? string? any/c)
>   (error "not implemented"))
> 
> Is this possible? I fear I can't use a macro because I don't know exactly
> which struct I'll get at runtime.
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