[racket] using scribble's evaluator for planet packages

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Wed Jun 15 18:01:50 EDT 2011

On Thu, Jun 16, 2011 at 5:44 AM, Eli Barzilay <eli at barzilay.org> wrote:
>> If, for some reason, the best we can do is improve the error
>> message, how about reporting it in terms of the Scribble forms we're
>> actually using:
>>   "examples: cannot read output of given evaluator, expected a string
>> but got: #f"
> That would involve changing more than I'm comfortable with in that
> file.  For example,
>  - `interaction' is a macro that expands to `interaction0',
>  - which is a macro that expands to `titled-interaction',
>  - which is a macro that expands to `do-titled-interaction',
>  - which is a function that
>    - calls `do-eval' to do the evaluation and get the resulting
>      values and outputs
>    - and then calls the `interleave' function
>      - which calls `format-output' to show the two outputs.
>        (which is where I put the check)
> So 'interaction should be threaded through all of that to get that
> error message, and checking whether any of these are also part of the
> known interface and in that case have internal versions with the
> additional argument.

This is not a good argument, if I'm understanding you correctly. I
think you're saying "it is too annoying to give a good error message"
which is not a reasonable argument.


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