I do, I have attached a scheme source example file.

1. Start emacs with "emacs -Q".

2. Enable semantic-mode with M-x semantic-mode

3. Open bugtest.scm

And emacs should enter the debugger when semantic-idle-scheduler starts 
working.

Thanks,
David


On 7/8/19 9:08 PM, Lars Ingebrigtsen wrote:
> David Palma <dbpalma9@gmail.com> writes:
>
>> Semantic enters the debugger whenever it's parsing invalid scheme code with
>> matching parentheses. The error code is "A Rule must return a single
>> tag-line list!"
>>
>> To trigger this simply write
>> (define )
>>
>> with electric matching pair mode active, the ending parenthesis is
>> automatically put and semantic constantly tries to enter the debugger,
>> making it unusable.
> Do you have a recipe for how to reproduce this bug, starting with
> "emacs -Q"?
>