Well that's solution for your underlying problem, but not the OP. ;)

The interested reader might want to know that Perl has also tracers in the Devel namespace.

perlrun

• dt:MOD=[bar,baz]
  runs the program under the control of a debugging, profiling, or tracing module installed as Devel::MOD. E.g., -d:DProf executes the program using the Devel::DProf profiler. As with the -M flag, options may be passed to the Devel::MOD package where they will be received and interpreted by the Devel::MOD::import routine. Again, like -M, use --d:-MOD to call Devel::MOD::unimport instead of import. The comma- separated list of options must follow a = character. If t is specified, it indicates to the debugger that threads will be used in the code being debugged. See perldebug

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