The package of a line of code is set when that line is compiled.

Furthermore, package is lexically scoped, so you can't just put the eval in a BEGIN.

You can do 

my $p = 'Package';
my $c = 'print(__PACKAGE__);';  # Some code
eval "package $a; $c";

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In reply to Re^2: How not to hardcode a package name? by ikegami
in thread How not to hardcode a package name? by blazar

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