There is an issue with the gui tracer, i.e. the debugger. I am using the DCG feature. With some of my DCG clauses, the gui tracer can’t display the source code. Instead it shows a decompiled listing of the clause. E.g. it will show “decompiled listing of 11th clause of question/3”. I noticed th…

[image] martin: Its this that the tracer can’t handle: “… → …, {once( ( … ; … ) )}, …”. I use the DCG with {} regularly and while I do sometimes see the problem you note, I don’t think that it is that. If the source code is edited without being reloaded that can cause the problem you see an…

Thank you for your reply Eric. If I see the tracer is not displaying the source code of one clause, then I save all my source files in my editor, and restart SWI prolog, then start the tracer. This normally fixes it. But the problem with “{once(…)}” was not fixed by restarting prolog. This seems…

[image] EricGT: “… → …, {once( ( … ; … ) )}, …”. I did a very basic test based on your example “… → …, {once( ( … ; … ) )}, …”. test_clause_1 --> { once( ( true ; false ) ) }. test_clause_2 --> {…

As suggested by Jan to use retry, here is some captures of it fixing the problem. Code and debugger out of sync. [image] Location of the retry button. [image] Code and debugger in sync, but clause restarted. [image]

Thank you for that suggestion Eric. My problem was different, when the problem occurred it was showing a decompiled listing of the code, it was not showing the source code. I don’t know if “retry” will help when the gui tracer is not showing the source code, and is showing a decompiled listing o…

Small bug in the gui tracer

Help!

martin May 21, 2019, 11:55pm 5

Thank you Eric.
We seem to be managing to pin it down.

–
Martin.

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Small bug in the gui tracer

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