in reply to What is the difference between $array[1] and @array[1]?

The context, and that the second one warns when warnings are in effect: 
$ perl -E 'sub w { say wantarray ? "list" : "item" }; @a[0] = w(); $a[
+0] = w()'
list
item

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(Update: slightly clearer code)

In Section Seekers of Perl Wisdom