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  1. or download this
    $ perl -c -we'my %f; my @a = @f{qw# a b #}'
Scalar value @f{qw# a b #} better written as $f{qw# a b #} at -e line 
+1.
-e syntax OK
  2. or download this
    $ perl -c -we'my %f; my @a = @f{qw( a b )}'
-e syntax OK
...
$ perl -c -we'my %f; my @a = @f{qw$ a b $}'
Scalar value @f{qw$ a b $} better written as $f{qw$ a b $} at -e line 
+1.
-e syntax OK