Parsing $0 might not be very pretty, but if it works, why not use it?
Anyway:
my $foo = 'bar';
BEGIN {
print $foo;
}
Your my statement is executed in 2 different stages: the declaration is run at "compile time" (as soon as the compiler sees it), and the assignment is run at "run time".
Begin blocks also run at compile time, so the order of execution of the above code would be something like:
my $foo;
print $foo;
$foo = 'bar';
This also explains why the code also runs under strict: BEGIN does not have its own namespace and lexical variables don't use namespaces anyway.
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