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  1. or download this
        @files = { local(@ARGV, $/) = @filenames; <> }; # missing 'do'
    
  2. or download this
        @files = do { local(@ARGV, $/) = @filenames; <> };
    
  3. or download this
        @foo{ @foo } = 0 .. @foo; # off-by-one error
    
  4. or download this
        @foo{ @foo } = 0 .. $#foo;