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$x = 4;         # Scalar assignment operator (sassign)
($x) = 4;       # List assignment operator   (aassign)
...

@a = ;          # Illegal
@a = ();        # Stub operator

my ($x) = 4;    # Same as: (my $x) = 4;

...
use Mod my();   # Same as: use Mod ();

@a = my();      # Same as: @a = ();