DrRacket Debugger pause on error?

[Charles Rich]

Hi all, Is there a way to get the DrRacket debugger to pause when then is an error, so that one can inspect the values of variables?

Since this debugger otherwise has similar capabilities to other common debuggers, such as in Eclipse, it seems like there ought to be a way, but I could not find it with documentation or experimentation.

Thanks, -CR

[Jack Firth]

I'm not sure about how to do this with the DrRacket debugger, but you can use `debug-repl`[1] from the `debug` package to basically set a breakpoint that opens a REPL you can use to inspect variables in. This works in both DrRacket and regular command line racket.

[1] http://docs.racket-lang.org/debug/index.html?q=debug#%28form._%28%28lib._debug%2Frepl..rkt%29._debug-repl%29%29

[Charles Rich]

Hi Jack, Thanks for your reply. Setting breakpoints is not the
problem. The problem is to set things up so that when an *error*
happens, you end up in a paused state. You don't know in advance
where/when the error is going to happen. It might not always be at
the same location or every time that location in the code is executed.
(You can do this in many other debuggers).

Btw, entering a REPL when the error happens would be fine---it doesn't
have to be inside the GUI debugger.

-CR

-CR

On Tue, Oct 4, 2016 at 2:57 PM, Jack Firth <jackh...@gmail.com> wrote:
> I'm not sure about how to do this with the DrRacket debugger, but you can use `debug-repl`[1] from the `debug` package to basically set a breakpoint that opens a REPL you can use to inspect variables in. This works in both DrRacket and regular command line racket.
>
> [1] http://docs.racket-lang.org/debug/index.html?q=debug#%28form._%28%28lib._debug%2Frepl..rkt%29._debug-repl%29%29
>

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--
Dr. Charles Rich, Professor, Computer Science Department
Interactive Media and Game Development Program
Robotics Engineering Program
Worcester Polytechnic Institute, Fuller Laboratories B25b
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