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Before calling the sub test_this @arr: 1 2 3 4 5 6 7 8 9 10
Inside the sub, before the map @arr: 1 2 3 4 5 6 7 8 9 10
...
  _ Use of uninitialized value $_[6] in join or string at foo line 11.
 
After calling the sub test_this @arr: 2 4 6 8 10 12 14 16 18 20

panic: attempt to copy freed scalar 7fe03e8040b0 to 7fe03e82c858 at /o
+pt/local/lib/perl5/5.26/darwin-thread-multi-2level/Data/Dumper.pm lin
+e 602.