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| author | Nicholas Clark <nick@ccl4.org> | 2008-09-02 15:18:57 +0000 |
|---|---|---|
| committer | Nicholas Clark <nick@ccl4.org> | 2008-09-02 15:18:57 +0000 |
| commit | 162f8c6795b94ac69ddd84e3f510dab96b20003f (patch) | |
| tree | 960b08a0c09398af2f532e9ce3a630a324beaf90 /pod/perltodo.pod | |
| parent | 98fca0e8e75e558070559599425adf50018c09ba (diff) | |
| download | perl-162f8c6795b94ac69ddd84e3f510dab96b20003f.tar.gz | |
The tasks needed to get smart match fixing underway for 5.10.1
p4raw-id: //depot/perl@34241
Diffstat (limited to 'pod/perltodo.pod')
| -rw-r--r-- | pod/perltodo.pod | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/pod/perltodo.pod b/pod/perltodo.pod index 36f36bd261..f99c4ae565 100644 --- a/pod/perltodo.pod +++ b/pod/perltodo.pod @@ -23,6 +23,53 @@ programming languages offer you 1 line of immortality? =head1 Tasks that only need Perl knowledge +=head2 Smartmatch design issues + +In 5.10.0 the smartmatch operator C<~~> isn't working quite "right". But +before we can fix the implementation, we need to define what "right" is. +The first problem is that Robin Houston implemented the Perl 6 smart match +spec as of February 2006, when smart match was axiomatically symmetrical: +L<http://groups.google.com/group/perl.perl6.language/msg/bf2b486f089ad021> + +Since then the Perl 6 target moved, but the Perl 5 implementation did not. + +So it would be useful for someone to compare the Perl 6 smartmatch table +as of February 2006 L<http://svn.perl.org/viewvc/perl6/doc/trunk/design/syn/S03.pod?view=markup&pathrev=7615> +and the current table L<http://svn.perl.org/viewvc/perl6/doc/trunk/design/syn/S03.pod?revision=14556&view=markup> +and tabulate the differences in Perl 6. The diff is +C<svn diff -r7615:14556 http://svn.perl.org/perl6/doc/trunk/design/syn/S03.pod> +-- search for C<=head1 Smart matching> + +With that done and published, someone (else) can then map any changed Perl 6 +semantics back to Perl 5, based on how the existing semantics map to Perl 5: +L<http://search.cpan.org/~rgarcia/perl-5.10.0/pod/perlsyn.pod#Smart_matching_in_detail> + + +There are also some questions that need answering: + +=over 4 + +=item * + +How do you negate one? (documentation issue) +http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-01/msg00071.html + +=item * + +Array behaviors +http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2007-12/msg00799.html + +* Should smart matches be symmetrical? (Perl 6 says no) + +* Other differences between Perl 5 and Perl 6 smart match? + +=item * + +Objects and smart match +http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2007-12/msg00865.html + +=back + =head2 Remove duplication of test setup. Schwern notes, that there's duplication of code - lots and lots of tests have |