I also observed the same: it was working but now it doesn’t work.

Without that debugger I couldn't have finished my thesis work in which there’s 
a huge recursive SML function of 400+ lines [1] to compute the transitions from 
any CCS term and returns a theorem.

—Chun

[1] 
https://github.com/HOL-Theorem-Prover/HOL/blob/master/examples/CCS/CCSConv.sml

> Il giorno 20 apr 2018, alle ore 07:11, Thomas Tuerk <tho...@tuerk-brechen.de> 
> ha scritto:
> 
> I'm also not using the Poly/ML debugger and don't think this has high
> priority. I was just curious and tried it with an old version I had
> lying around. With Poly/ML 5.6 and revision
> 15e37a5df6ea4b6680e57420257ba30b2e45ceac from 12 July 2017 it did still
> work. With the same Poly/ML and a current version
> 689b9eb3eccdebc314664a6e583c8d8bc76c0591 I get the behavior described by
> Mario.
> 
> Thomas
> 
> 
> On 20.04.2018 06:02, michael.norr...@data61.csiro.au wrote:
>> I've never used the Poly/ML debugger. The HOL4 REPL is a custom piece of 
>> code (handling the lexing of “...” forms, for example), so I guess this 
>> interferes with what the debugger wants to do.  If you wanted to use the 
>> debugger, you might be able to get things to work by manually use-ing the 
>> HOL SML sources into the standard poly REPL.
>> 
>> Michael
>> 
>> On 20/4/18, 02:44, "Mario Xerxes Castelán Castro" <marioxcc...@yandex.com> 
>> wrote:
>> 
>>    Hello.
>> 
>>    When I tried to use the Poly/ML debugger as described in
>>    <http://www.polyml.org/documentation/Tutorials/Debugging.html>
>>    breakpoints do not work. “breakIn” does not raise an exception, but when
>>    applying the exception, the debugger is not entered. I check this within
>>    the HOL mode for Emacs, running “hol.bare” from the command like and
>>    running “poly” from the command line (to confirm that debugging works as
>>    intended without HOL). Only the later (Poly/ML without HOL4) worked.
>> 
>>    Is there a way to use the debugger from within HOL4?
>> 
>>    Thanks.
>> 
>>    --
>>    Do not eat animals; respect them as you respect people.
>>    https://duckduckgo.com/?q=how+to+(become+OR+eat)+vegan
>> 
>> 
>> 
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> 
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