Under the heading of Stupid (Perl) Things I Did Today, is this Forehead Slapper: 
# define option names and defaults
our $UNIQUE_OPT         = q/unique/;
our $FORCE_OPT          = q/force/;
our $VERBOSE_OPT        = q/verbose/;
our $OUTPUT_EXT_OPT     = q/ext/;

# create option specs for Getopt
my @option_config = qw( $UNIQUE_OPT
                        $FORCE_OPT
                        $VERBOSE_OPT
                        $OUTPUT_EXT_OPT=s
                      );
                      
# create option hash for Getopt
my(%option, %option_config);
foreach my $option_config ( @option_config ) 
{
    # copy $option_config to $option_name, keep only name of option
    ( my $option_name = $option_config ) =~ s/\W.*$//;
    # save a reference to the %option value in %option_config hash
    $option_config{$option_config} = \$option{$option_name};
}
# process options
GetOptions %option_config or usage();

if ( $option{$UNIQUE_OPT} and $option{$FORCE_OPT} )
{
    die "-$UNIQUE_OPT and -$FORCE_OPT are mutually exclusive." 
      . " See $SCRIPT_NAME -help for syntax.";
}

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This broke with: 
C:\>perl myscript stuff
Error in option spec: "$VERBOSE_OPT"
Error in option spec: "$FORCE_OPT"
Error in option spec: "$OUTPUT_EXT_OPT=s"
Error in option spec: "$UNIQUE_OPT"

[download]
Due to the hour of the day, I sat and stared at this for some time, scanned through Getopt::Long, and scratched my head.

Finally it hit me -- qw doesn't interpolate, so things like $UNIQUE_OPT don't DWIM. The fix was: 

my @option_config = split ' ',
                    qq( $UNIQUE_OPT
                        $FORCE_OPT
                        $VERBOSE_OPT
                        $OUTPUT_EXT_OPT=s
                      );

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which looks very similar to the rough equivalent of qw as found in perlop: 
split(' ', q/STRING/);

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In fact, it made me wonder if this DWIM: 
my @option_config = qw" $UNIQUE_OPT
                        $FORCE_OPT
                        $VERBOSE_OPT
                        $OUTPUT_EXT_OPT=s
                      ";

[download]
:( Sadly, it doesn't.

Anyone care to comment on whether this should or shouldn't make it into the language?

-QM
--
Quantum Mechanics: The dreams stuff is made of

In reply to qw "$string $string" doesn't interpolate by QM

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