The answers above address your question directly. If you ever need to figure this out on your own, the B::Deparse module, which comes standard with every Perl distribution, can be very helpful:
$ perl -MO=Deparse -e 'my $foo = bar() or baz()'
baz() unless my $foo = bar();
-e syntax OK
$ perl -MO=Deparse -e 'my $foo = bar() || baz()'
my $foo = bar() || baz();
-e syntax OK
You can see how the two are interpreted very differently.
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