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$ /usr/bin/perl -MData::Dumper -E '%i->{a}->{b} = "c"; say Dumper \%i'
Can't use a hash as a reference at -e line 1.
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c
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c
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$ perl -MData::Dumper -E '%i=(s=>1,b=>3); %j=%h; %k=(b=>4,c=>5); @diff = (grep {!exists $i{$_}} keys %j, grep {!exists $j{$_}} keys %i); say Dumper \@diff; @diff = (grep {!exists $i{$_}} keys %k, grep {!exists $k{$_}} keys %i); say Dumper \@diff; '
$VAR1 = [];
$VAR1 = [
'c'
];
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