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use warnings;
use diagnostics;

Variable "$list_ref" will not stay shared at - line 15 (#1)
    (W closure) An inner (nested) named subroutine is referencing a
...
    anonymous, using the sub {} syntax.  When inner anonymous subs tha
+t
    reference variables in outer subroutines are called or referenced,
+ they
    are automatically rebound to the current values of such variables.