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Think about Loose Coupling
 
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Each use statement is executed at the moment it's been parsed. The same applies to a BEGIN block. my has two parts - the declaration of the variable happens immediately at compile time, the assignment happens later at run time. Therefore, in the first case, the dumping happens before the BEGIN block has been fully parsed, which means its (the BEGIN block's) code hasn't been run yet.

To make the variable lexical, specify

my %vars;
before the BEGIN block.

Update: You probably wanted something like

{ my %vars; BEGIN { $vars{k} = 'v'; } use Acme::PERLANCAR::DumpImportArgs %vars; }

Update 2: Explanation of two parts of my.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: Assignment and use statement in the same BEGIN block by choroba
in thread Assignment and use statement in the same BEGIN block by perlancar

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