Re: better error messages through assertions

[Philip McGrath <philip@philipmcgrath.com>]

Hi,

On 3/30/22 09:28, Andy Wingo wrote:
> 
> Too bad about all that other crap about checking whether the index is in
> range and the field is boxed or not, though :-/  Probably there is a
> better design...
> 
> Andy

For the index-out-of-range part, when I saw `record-accessor`, I thought 
of it as similar to Racket's `make-struct-field-accessor`[1], which can 
check the index just once, when the accessor is created, rather than 
each time the accessor is used. That's (part of) what Racket's `struct` 
form expands to.

Would it be reasonable to use `record-accessor` in the implementation of 
SRFI 9?

-Philip

[1]: 
https://docs.racket-lang.org/reference/creatingmorestructs.html#%28def._%28%28quote._~23~25kernel%29._make-struct-field-accessor%29%29