Demonstration:
sub f(&) { my ($cr) = @_; push @keep_alive, $cr; say $cr; }
my $x = '...';
f { '...' } for 1..2;
f { $x } for 1..2;
CODE(0x3396f4) \ same for non-capturing
CODE(0x3396f4) /
CODE(0x24b1cc) \ different for capturing
CODE(0x338c04) /
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