Based on the description in "perdebug":

w expr

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Add a global watch-expression. Whenever a watched global changes the debugger will stop and display the old and new values.

I would expect w (3 == $var) to do what you are asking for.

In reply to Re^3: Get the number of the current test when debugging a test script by RonW
in thread Get the number of the current test when debugging a test script by Dumu

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