I'm trying to use perl6-debug-m for doing Regex and Grammar Debugging. 

When I use Rakudo version 2016.10 , it's works fine. I get the behaviour which 
is described at https://perl6advent.wordpress.com/2012/12/05/a-perl-6-debugger/ 
in section "Regex and Grammar Debugging". I can easily see how the 
regex/grammar expressions are evaluated. This is a great help. 

When I use with Rakudo version 2017.07 (I also tried with Rakudo version 
2018.01), it doesn't work as expected. The perl6 debugger doesn't show anything 
about the regex/grammar evaluation. 

I use the same perl6 program for testing. The only difference I see is the 
perl6 version. 

Trace in Rakudo version 2017.07 (not working as I expect) 

Trace in Rakudo version 2016.10 (working as I expect) 

Do you have any explanation ? Is it a bug or I miss something ? 

Thanks a lot for your help. 

Best Regards, 

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