perldoc perl5150delta说:
$$can be assigned to $$was made read‐only in Perl 5.8.0. But only sometimes: "local $$" would make it writable again. Some CPAN modules were using "local $$" or XS code to bypass the read‐only check,so there is no reason to keep $$read‐only. (This change also allowed a bug to be fixed while maintaining backward compatibility.)
$$是当前的进程ID,为什么要在世界上分配给它?
解决方法
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