The current value of the debugging flags. May be read or set. Like itscommand-line equivalent, you can use numeric or symbolic values, e.g.$^D = 10 or$^D = "st". See"-Dnumber" in perlrun. The contents of this variable also affects the debugger operation. See"Debugger Internals" in perldebguts.
Mnemonic: value of-D switch.
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