@a=('a', 'b', 'c');
$a = sort(@a);
print $a;
Use of uninitialized value at - line 3.

##</code><code>##

There is no equivalent operator to force an expression to
be interpolated in list context because it's in practice never
needed.  If you really wanted to do so, however, you could use
the construction @{[ (some expression) ]}, but usually a simple
(some expression) suffices.

##</code><code>##

@a=('a', 'b', 'c');
$a = @{[sort(@a)]};
print $a;