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```
my @a=(3,4);

...
}

x(@a);
```

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$ perl5220 -w ~/tmp/p
Use of uninitialized value $_ in concatenation (.) or string at /home/
+davem/tmp/p line 9.
Use of uninitialized value $_ in concatenation (.) or string at /home/
+davem/tmp/p line 9.
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