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my $arr[] = [42,43,44]; # "typed" array ref

...
my @arr;                ## @arr masks earlier declaration in same scop
+e
my $arr;                ## $arr masks earlier declaration in same scop
+e
my $arr{}               ## $arr{} masks earlier declaration in same sc
+ope

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my $a_ref = [1,2,3];    # old style
$a_ref->{x};            ## Not a HASH reference (run time)