Perl: “Variable will not stay shared”

Question

I looked up a few answers dealing with this warning, but neither did they help me, nor do I truly understand what Perl is doing here at all. Here\'s what I WANT it to do:

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Answer 1

Following http://www.foo.be/docs/perl/cookbook/ch10_17.htm , you should define a local GLOB as follows :

local *innerSub = sub {
    ...
} 
#You can call this sub without ->
innerSub( ... ) 

Note that even if warning is displayed, the result stay the same as it should be expected : variables that are not defined in the inner sub are modified in the outer sub scope. I cannot see what this warning is about.