$Data::Dumper::Indent is fully qualified , you don't need resp. can't declare it.
Workarounds:
- you can disable the specific warning
- eval the use and your settings
D:\tmp>perl
use strict;
use warnings;
eval <<'__CODE__';
use Data::Dumper;
$Data::Dumper::Indent = 0;
__CODE__
__END__
D:\tmp>
update
Full demo:
NB: in order to use Dumper w/o parens or leading '&'-sigil you will need to declare it at compile time with subs
D:\tmp>perl
use strict;
use warnings;
#use subs qw/Dumper/;
eval <<'__CODE__';
use Data::Dumper;
$Data::Dumper::Indent = 0;
__CODE__
print Dumper( [map {{$_=>$a++}} "a".."d"] );
__END__
$VAR1 = [{'a' => 0},{'b' => 1},{'c' => 2},{'d' => 3}];
D:\tmp>
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