Versions 5.6.1, 5.8.0, and 5.8.2 all get it right when the -p (parentheses) option is passed to Deparse: 

$ perl -MO=Deparse,-p -e '$a=$;;print $a'
($a = $;);
print($a);
-e syntax OK

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In reply to Re: Parsing of subscript separator in B::Deparse by danger
in thread Parsing of subscript separator in B::Deparse by dbwiz

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