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```
$x || $y || $z || 1;
```

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[ ~/tmp ] $ perl -we 'use strict; my $x'
[ ~/tmp ] $ perl -we 'my $x'
...
Name "main::x" used only once: possible typo at -e line 1.
[ ~/tmp ] $ perl -we 'no warnings qw(once); $x'
[ ~/tmp ] $