=head1 NAME
-perldelta - what is new for perl v5.12.1
+perl5121delta - what is new for perl v5.12.1
=head1 DESCRIPTION
=head1 Core Enhancements
Other than the bug fixes listed below, there should be no user-visible
-changes to the core langauge in this release.
+changes to the core language in this release.
=head1 Modules and Pragmata
=item *
-We fixed exporting of C<version::is_strict> and C<version::is_lax>
+We fixed exporting of C<is_strict> and C<is_lax> from L<version>.
These were being exported with a wrapper that treated them as method
-calls, which causes them to fail. They are just functions, are
+calls, which caused them to fail. They are just functions, are
documented as such, and should never be subclassed, so this patch
just exports them directly as functions without the wrapper.
=item *
-We made a small fix to CPANPLUS's test suite to fix an occasional spurious test
-failure.
+We made a small fix to the L<CPANPLUS> test suite to fix an occasional spurious test failure.
+
+=item *
+
+We upgraded L<Safe> to version 2.27 to wrap coderefs retured by C<reval()> and C<rdo()>.
=back
=item *
-We've clarified the multiple-angle-bracket construct in the spec for POD.
+We've clarified the multiple-angle-bracket construct in the spec for POD
+in L<perlpodspec>
=item *
=item *
-We removed a false claim that all text strings are Unicode strings in Perl.
+We removed a false claim in L<perlunitut> that all text strings are Unicode strings in Perl.
=item *
-GitHub's mirror is now at mirrors/perl, not github/perl
+We updated the Github mirror link in L<perlrepository> to mirrors/perl, not github/perl
=item *
=item *
-We improved documentation about F<$sitelibexp/sitecustomize.pl>.
+We improved documentation about F<$sitelibexp/sitecustomize.pl> in L<perlrun>.
=item *
-We corrected L<perlmodlib.pod> which had unintentionally ommitted a number of modules.
+We corrected L<perlmodlib.pod> which had unintentionally omitted a number of modules.
=item *
=item *
-We reinstated some erroneously-removed documentation about quotemeta.
+We reinstated some erroneously-removed documentation about quotemeta in L<perlfunc>.
=item *
=item *
A bug in how we process filetest operations could cause a segfault.
-Filetest don't always expect an op on the stack, so we now use
+Filetests don't always expect an op on the stack, so we now use
TOPs only if we're sure that we're not stat'ing the _ filehandle.
This is indicated by OPf_KIDS (as checked in ck_ftst).
=item *
-utf8::is_utf8 now respects respect GMAGIC (e.g. $1)
+utf8::is_utf8 now respects GMAGIC (e.g. $1)
=item *
See also: L<http://rt.perl.org/rt3/Public/Bug/Display.html?id=72704>
=item *
-
+
We fixed a small bug in lex_stuff_pvn() that caused spurious syntax errors
-in an obscure situation. It happend when stuffing was s performed on the
+in an obscure situation. It happened when stuffing was performed on the
last line of a file and the line ended with a statement that lacked a
terminating semicolon.
We fixed a bug that could cause \N{} constructs followed by a single . to
be parsed incorrectly.
-
+
See also: L<http://rt.perl.org/rt3/Public/Bug/Display.html?id=74978>
=item *
=item *
We fixed a regression in the handling of labels immediately before string
-evals introduced in Perl 5.12.0.
+evals that was introduced in Perl 5.12.0.
See also: L<http://rt.perl.org/rt3/Public/Bug/Display.html?id=74290>
=back
+=head1 Known Problems
+
+=over
+
+=item *
+
+C<List::Util::first> misbehaves in the presence of a lexical C<$_>
+(typically introduced by C<my $_> or implicitly by C<given>). The variable
+which gets set for each iteration is the package variable C<$_>, not the
+lexical C<$_>.
+
+A similar issue may occur in other modules that provide functions which
+take a block as their first argument, like
+
+ foo { ... $_ ...} list
+
+See also: L<http://rt.perl.org/rt3/Public/Bug/Display.html?id=67694>
+
+=item *
+
+C<Module::Load::Conditional> and C<version> have an unfortunate
+interaction which can cause C<CPANPLUS> to crash when it encounters
+an unparseable version string. Upgrading to C<CPANPLUS> 0.9004 or
+C<Module::Load::Conditional> 0.38 from CPAN will resolve this issue.
+
+=back
+
+
=head1 Acknowledgements
Perl 5.12.1 represents approximately four weeks of development since
-Perl 5.12.0 and contains approximately about 4,000 lines of changes
+Perl 5.12.0 and contains approximately 4,000 lines of changes
across 142 files from 28 authors.
Perl continues to flourish into its third decade thanks to a vibrant