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2;0 juerd@ouranos:~$ cat test.pl
#!/usr/bin/perl -w
...
${ resolve('this one does not exist') }  +=  2;
2;0 juerd@ouranos:~$ perl test.pl
Use of uninitialized value in addition (+) at test.pl line 13.

2;0 juerd@ouranos:~$ perl -e'undef christmas'
Segmentation fault
2;139 juerd@ouranos:~$