The debugger is IMHO operating on a statement level.

IOW the interpreter is calling the debugger routines for every semicolon (roughly).

The OP tree has an entry for every statements start holding all meta inf like line numbers.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Re^4: Dereference of undefined value OK under strictures? by LanX
in thread Dereference of undefined value OK under strictures? by AnomalousMonk

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