Is it possible to set a breakpoint in the Perl debugger without modifying the source?

It sounds like you want the be command in the interactive Perl debugger, which can be used to set future breakpoints. Or maybe the c command, which works like GDB's until if given an argument.

You can use a combination of the be command, the f command, the contents of %INC, and the c command to quickly navigate through your code.

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