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Ovid (2709)

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Stuff with the Perl Foundation. A couple of patches in the Perl core. A few CPAN modules. That about sums it up.

Journal of Ovid (2709)

Friday September 26, 2003
06:25 PM

Long Friday

[ #14934 ]

My goodness, it's been a long day. I spent an hour tracking down a bug caused by the following code.

my @methods = qw/follow_link get title/;

use Class::MethodMaker
    new    => 'new',
    object => [
        'WWW::Mechanize' => {
            slot       => 'browser',
            comp_mthds => [@methods],

If it doesn't just jump out at you, you'll slap yourself when you find it.

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  • Did sir forget his underscore?

    And, out of interest, do you use @methods anywhere else? Looks like a useless use of variable to me. [qw/.../] is perfectly fine...
    • Re:Oops (Score:3, Interesting)

      Oh goody. You're going to slap yourself :)

      The first thing you do is create a file named "":

      package Foo;

      sub import { print "@_" }


      Then, in the same directory, run the following script:

      #!/usr/local/bin/perl -w
      use strict;

      BEGIN { unshift @INC => '.' }
      my @methods = qw/bar baz/;
      use Foo @methods;

      That prints "Foo". Foo's import method gets called with no arguments because the assignment to @methods happens after the use statement, even though strict does not complain because @methods has al

      • I think that if you do a
        use constant METHODS => qw( foo bar bat );
        then you can pass 'em in like you want.


      • Assign to @methods in a BEGIN block.
        my @methods;
        BEGIN { @methods =  qw/follow_link get title/; }
      • You're right, I'm slapping myself. Iff need to use @methods anywhere else in your code.