If you want to modify the value of a built in, you must you local to do it, and then the modification will be local to the enclosing code block.

A better approach, which doesn't suffer from the problems of dynamic scoping with local, would be to use the lexically scoped (no) warnings pragma instead for this particular situation - see perllexwarn

In reply to Re^2: Error: Can't use global $^W in "my" by calin
in thread Error: Can't use global $^W in "my" by Likeless

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