=encoding utf8
=for comment
-This has been completed up to 7be5bd17, except for:
-bb789b09de07edfb74477eb1603949c96d60927d (Dave Mitchell)
+This has been completed up to 8367b6810 except for:
+747627ec455e0765e07733ece1545aa3f728a00a (Steffen Müller)
+dd35fa16610ef2fa0d46f5129e626b99cf350d77 (H. Merijn Brand)
+e64345f82d66a32f6da47acf482e7e6c9282b433 (Steffen Müller)
+f1d35e3443aa8451bf47be80983076fe28626113 (Karthik Rajagopalan)
=head1 NAME
[ this is a template for a new perldelta file. Any text flagged as
XXX needs to be processed before release. ]
-perldelta - what is new for perl v5.15.1
+perldelta - what is new for perl v5.15.2
=head1 DESCRIPTION
This document describes differences between the 5.15.1 release and
-the 5.15.0 release.
+the 5.15.2 release.
-If you are upgrading from an earlier release such as 5.14.0, first read
-L<perl5150delta>, which describes differences between 5.14.0 and
-5.15.0.
+If you are upgrading from an earlier release such as 5.15.0, first read
+L<perl5151delta>, which describes differences between 5.15.0 and
+5.15.1.
=head1 Notice
[ List each enhancement as a =head2 entry ]
-=head2 C<splice()> doesn't warn when truncating
+=head2 Subroutines in the CORE namespace
-You can now limit the size of an array using C<splice(@a,MAX_LEN)> without
-worrying about warnings.
+Many Perl keywords are now available as subroutines in the CORE namespace.
+These cannot be called through references or via C<&foo> syntax yet, but
+must be called as barewords. In other words, you can now do this:
-=head2 The C<\$> prototype accepts any scalar lvalue
+ BEGIN { *entangle = \&CORE::tie }
+ entangle $variable, $package, @args;
-The C<\$> and C<\[$]> subroutine prototypes now accept any scalar lvalue
-argument. Previously they only accepted scalars beginning with C<$> and
-hash and array elements. This change makes them consistent with the way
-the built-in C<read> and C<recv> functions (among others) parse their
-arguments. This means that one can override the built-in functions with
-custom subroutines that parse their arguments the same way.
+This currently works for overridable keywords other than C<dump> and the
+infix operators.
-=head2 You can now C<study> more than one string
+Work is under way to allow these subroutines to be called through
+references.
-The restriction that you can only have one C<study> active at a time has been
-removed. You can now usefully C<study> as many strings as you want (until you
-exhaust memory).
+=head2 C<__FILE__()> Syntax
-=head2 The Unicode C<Script_Extensions> property is now supported.
-
-New in Unicode 6.0, this is an improved C<Script> property. Details
-are in L<perlunicode/Scripts>.
-
-=head2 DTrace probes for interpreter phase change
-
-The C<phase-change> probes will fire when the interpreter's phase
-changes, which tracks the C<${^GLOBAL_PHASE}> variable. C<arg0> is
-the new phase name; C<arg1> is the old one. This is useful mostly
-for limiting your instrumentation to one or more of: compile time,
-run time, destruct time.
-
-=head2 New Pad API
-
-Many new functions have been added to the API for manipulating lexical
-pads. See L<perlapi/Pad Data Structures> for more information.
+The C<__FILE__>, C<__LINE__> and C<__PACKAGE__> tokens can now be written
+with an empty pair of parentheses after them. This makes them parse the
+same way as C<time>, C<fork> and other built-in functions.
=head1 Security
[ List each incompatible change as a =head2 entry ]
+=head2 C<UNIVERSAL::VERSION> now returns $VERSION
+
+C<UNIVERSAL::VERSION> now return whatever is in $VERSION, instead of
+returning $VERSION converted to a version object and then to a string.
+As a result, it no longer parses the version when called without arguments,
+so it no longer dies in that case for malformed versions. This allows
+custom version number parsers to use C<< ->VERSION >> to retrieve the
+version number, as was the case in Perl 5.8 [perl #95544].
+
=head1 Deprecations
XXX Any deprecated features, syntax, modules etc. should be listed here.
=item *
-The implementation of C<s///r> makes one less copy of the scalar's value.
-
-=item *
-
-If a studied scalar is C<split> with a regex, the engine will now take
-advantage of the C<study> data.
-
-=item *
-
-C<study> now uses considerably less memory for shorter strings. Strings shorter
-than 65535 characters use roughly half the memory than previously, strings
-shorter than 255 characters use roughly one quarter of the memory.
-
-=item *
-
-Recursive calls to lvalue subroutines in lvalue scalar context use less
-memory.
+XXX
=back
=item *
-The logic for parsing, merging, and dumping XS typemaps has been extracted
-from C<ExtUtils::ParseXS> into a module of its own, L<ExtUtils::Typemaps>.
-C<ExtUtils::Typemaps> offers an interface to typemap handling outside of
-the scope of the XS compiler itself.
-
-As a first use case of the improved API and extensibility, typemaps can now
-be included inline in XS code with a HEREDOC-like syntax:
-
- TYPEMAP: <<END_TYPEMAP
- MyType T_IV
- END_TYPEMAP
+XXX
=back
=item *
-L<B::Deparse> has been upgrade from version 1.05 to 1.06.
+L<B> has been upgraded from version 1.30 to version 1.31
-It now correctly deparses interpolation of punctuation variables (like
-C<@*>) that do not interpolate without braces [perl #93990].
+The XS code has changed slightly, as it was too tightly coupled to
+the contents of the header F<embedvar.h>. Documentation in L<B::Terse>
+and L<B::Xref> has been improved, hence their versions have been increased.
=item *
-L<CGI> has been upgraded from version 3.54 to version 3.55
-
-[THINGS THAT MAY BREAK YOUR CODE]
-
-C<url()> was fixed to return C<PATH_INFO> when it is explicitly requested
-with either the path=>1 or path_info=>1 flag.
-
-If your code is running under mod_rewrite (or compatible) and you are calling C<self_url()> or
-you are calling C<url()> and passing path_info=>1, These methods will actually be
-returning C<PATH_INFO> now, as you have explicitly requested, or has C<self_url()>
-has requested on your behalf.
+L<CPAN> has been upgraded from version 1.9600 to version 1.9800
-The C<PATH_INFO> has been omitted in such URLs since the issue was introduced
-in the 3.12 release in December, 2005.
-
-This bug is so old your application may have come to depend on it or
-workaround it. Check for application before upgrading to this release.
+=item *
-Examples of affected method calls:
+L<CPANPLUS> has been upgraded from version 0.9108 to version 0.9109
- $q->url(-absolute => 1, -query => 1, -path_info => 1 )
- $q->url(-path=>1)
- $q->url(-full=>1,-path=>1)
- $q->url(-rewrite=>1,-path=>1)
- $q->self_url();
+Fixed support for v-strings and x.y.z versions with v5.8.4
=item *
-L<Compress::Raw::Bzip2> has been upgraded from version 2.035 to version 2.037
-
-=item *
+L<CPAN::Meta> has been upgraded from version 2.110930_001 to version 2.112150
-L<Compress::Raw::Zlib> has been upgraded from version 2.035 to version 2.037
+Stringify any objects encountered during conversion.
-Added offset parameter to CRC32
+Clarified that file paths in the 'provides' section must be in
+Unix-style (i.e. forward slashes)
=item *
-L<Compress::Zlib> has been upgraded from version 2.035 to version 2.037
+L<DB_File> has been upgraded from version 1.822 to version 1.824
-IO::Compress::Zip and IO::Uncompress::Unzip now have support for LZMA (method 14).
-There is a fix for a CRC issue in IO::Compress::Unzip and it supports Streamed
-Stored context now. And fixed a Zip64 issue in
-IO::Compress::Zip when the content size was exactly 0xFFFFFFFF.
+Will now croak if attempt to freeze/thaw DB_File object [RT #69985]
=item *
-L<CPANPLUS> has been upgraded from version 0.9105 to version 0.9107
-
-=item *
+L<diagnostics> has been upgraded from version 1.23 to 1.24.
-L<Cwd> has been upgraded from version 3.36 to 3.37, to address an
-incompatibility with the EPIC debugger.
+It now supports the %u formatting code. Previously it was unable to find
+descriptions for messages whose entries in L<perldiag> included that code
+[perl #94988].
=item *
-L<diagnostics> has been upgraded from version 1.22 to 1.23.
+L<Encode> has been upgraded from version 2.43 to version 2.44
-It now knows how to find descriptions for diagnostic messages ending with a
-dot, instead getting confused by it.
+Addressed 'decode_xs n-byte heap-overflow' security bug in Unicode.xs
=item *
-L<ExtUtils::MakeMaker> has been upgraded from version 6.57_05 to version 6.58
+L<ExtUtils::Install> has been upgraded from version 1.56 to version 1.57.
-=item *
-
-L<ExtUtils::ParseXS> has been upgraded from version 2.2210 to 3.00_01.
-
-Much of L<ExtUtils::ParseXS>, the module behind the XS compiler C<xsubpp>,
-was rewritten and cleaned up. It has been made somewhat more extensible
-and now finally uses strictures.
-
-The typemap logic has been moved into a separate module,
-L<ExtUtils::Typemaps>. See L</New Modules and Pragmata>, above.
+There is no change to ExtUtils::Install other than the version number
+increase, but L<ExtUtils::Installed> has been upgraded from version 1.999_001
+to version 1.999002 and a new C<skip_cwd> attribute has been added.
=item *
-L<IPC::Cmd> has been upgraded from version 0.70 to version 0.72
-
-Capturing of command output (both C<STDOUT> and C<STDERR>) is now supported
-using L<IPC::Open3> on MSWin32 without requiring L<IPC::Run>.
+L<ExtUtils::MakeMaker> has been upgraded from version 6.58 to version 6.59
=item *
-L<Locale::Codes> has been upgraded from version 3.16 to version 3.17
+L<IPC::Open3> has been upgraded from version 1.11 to 1.12.
-Added Language Extension codes (langext) and Language Variation codes
-(langvar) as defined in the IANA language registry.
+C<open3> with "-" for the program name works once more. This was broken in
+version 1.06 (and hence in Perl 5.14.0) [perl #95748].
-Added language codes from ISO 639-5
-
-Added language/script codes from the IANA language subtag
-registry
-
-Fixed an uninitialized value warning. RT 67438
+=item *
-Fixed the return value for the all_XXX_codes and all_XXX_names functions. RT 69100
+L<Module::Build> has been upgraded from version 0.3800 to version 0.39_01.
-Reorganized modules to move Locale::MODULE to Locale::Codes::MODULE to
-allow for cleaner future additions. The original four modules (Locale::Language,
-Locale::Currency, Locale::Country, Locale::Script) will continue to work, but
-all new sets of codes will be added in the Locale::Codes namespace.
+Pod to HTML internals changed to support revisions to Pod::Html in core.
+Also fixes some minor bugs. [rt.cpan.org #68585] [rt.cpan.org #67893]
+[rt.cpan.org #67008]
=item *
-L<attributes> has been upgraded from version 0.14 to 0.15, as part of the
-lvalue attribute warnings fix. See L</Selected Bug Fixes>, below.
+L<Module::Load> has been upgraded from version 0.18 to version 0.20
=item *
-L<Math::BigInt::FastCalc> has been upgraded from version 0.28 to version 0.29.
+L<Module::Metadata> has been upgraded from version 1.000004 to version 1.000005
-The XS code is now compiled with C<PERL_NO_GET_CONTEXT>, which will aid
-performance under ithreads.
+Added C<new_from_handle()> method.
=item *
-XXX This will probably be 2.53 for 5.15.1, as there has been a CPAN
-release of 2.52.
-
-L<Module::CoreList> has been upgraded from version 2.51 to 2.52.
-
-Some extraneous (and erroneous) entries have been removed
-[rt.cpan.org #69108].
+L<Params::Check> has been upgraded from version 0.28 to version 0.32
=item *
-L<Pod::Perldoc> has been upgraded from version 3.15_05 to 3.15_06.
+L<PerlIO::via> has been upgraded from version 0.11 to version 0.12.
-The B<-v> option now fetches the right section for C<$0>.
+The only change is a correction in the documentation.
=item *
-L<Pod::Simple> has been upgraded from version 3.16 to version 3.17
+L<Term::ANSIColor> has been upgraded from version 3.00 to version 3.01
-=item *
-
-L<Unicode::Collate> has been upgraded from version 0.76 to version 0.77
-
-Applied [perl #93470] silencing compiler warnings with -Wwrite-strings
+Only interpret an initial array reference as a list of colors, not any initial
+reference, allowing the colored function to work properly on objects with
+stringification defined.
=item *
-L<Win32API::File> has been upgraded from version 0.1101 to version 0.1200
-
-Added SetStdHandle and GetStdHandle functions
+L<Unicode::Collate> has been upgraded from version 0.77 to version 0.78
=item *
-L<threads> has been upgraded from version 1.83 to 1.84
-
-An unused variable was removed from the XS code.
+L<Unicode::Normalize> has been upgraded from version 1.12 to version 1.13
=back
=item *
-Perl 4-era .pl libraries
-
-Perl used to bundle a handful of library files that predate Perl 5. Most of
-these files, which have been deprecated since version 5.14.0, have now been
-removed. If your code still relies on these libraries, you can install them
-again from C<Perl4::CoreLibs> on CPAN.
+XXX
=back
XXX Changes which create B<new> files in F<pod/> go here.
-=head3 L<perldtrace>
-
-L<perldtrace> describes Perl's DTrace support, listing the provided probes
-and gives examples of their use.
-
-=head3 L<perl5141delta>
+=head3 L<perlexperiment>
-The delta file for Perl 5.14.1 has been copied to blead.
+This document is intended to provide a list of experimental features in
+Perl. It is still a work in progress.
=head2 Changes to Existing Documentation
However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
section.
-=head3 L<XXX>
+=head3 L<perlsub>
=over 4
=item *
-XXX Description of the change here
-
-=item *
-
-L<perlxs> was extended with documentation on inline typemaps.
-
-=item *
-
-L<perlref> has a new L<Circular References|perlref/Circular References>
-section explaining how circularities may not be freed and how to solve that
-with weak references.
-
-=item *
-
-The documentation for smart match in L<perlsyn> has been corrected for the
-case of C<undef> on the left-hand side. The list of different smart match
-behaviours had an item in the wrong place.
+The ($;) prototype syntax, which has existed for rather a long time, is now
+documented in L<perlsub>. It allows a unary function to have the same
+precedence as a list operator.
=back
=item *
-XXX L<message|perldiag/"message">
+L<&CORE::%s cannot be called directly|perldiag/"&CORE::%s cannot be called directly">
+
+(F) You tried to call a subroutine in the C<CORE::> namespace
+with C<&foo> syntax or through a reference. The subroutines
+in this package cannot yet be called that way, but must be
+called as barewords. Something like this will work:
+
+ BEGIN { *shove = \&CORE::push; }
+ shove @array, 1,2,3; # pushes on to @array
=back
=item *
-The L<Invalid version format|perldiag/"Invalid version format (%s)">
-error message now says "negative version number" within the parentheses,
-rather than "non-numeric data", for negative numbers.
-
-=item *
-
-The two warnings
-L<Possible attempt to put comments in qw() list|perldiag/"Possible attempt to put comments in qw() list">
-and
-L<Possible attempt to separate words with commas|perldiag/"Possible attempt to separate words with commas">
-are no longer mutually exclusive: the same C<qw> construct may produce
-both.
-
-=item *
-
-Warnings that mention the names of lexical (C<my>) variables with Unicode
-characters in them now respect the presence or absence of the C<:utf8>
-layer on the output handle, instead of outputting UTF8 regardless. Also,
-the correct names are included in the strings passed to C<$SIG{__WARN__}>
-handlers, rather than the raw UTF8 bytes.
+XXX Describe change here
=back
entries for each change
Use L<XXX> with program names to get proper documentation linking. ]
-=head3 L<XXX>
+=head3 L<perlivp>
=over 4
=item *
-XXX
+Fixed a bug whereby other perls under the current directory could cause
+false positive failures.
+
+=item *
+
+Tests for .ph files have been removed, as these test have been optional since
+2005 and .ph files are no longer generated during installation.
=back
+=head3 L<splain>
+
+See the entry for C<< diagnostics >> in L</Updated Modules and Pragmata>,
+above.
+
=head1 Configuration and Compilation
XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
=item *
-XXX
+F<makedef.pl> has been refactored. This should have no noticeable affect on
+any of the platforms that use it as part of their build (AIX, VMS, Win32).
=back
=item *
-F<t/run/dtrace.t> was added to test Perl's DTrace support. This
-test will only be run if your Perl was built with C<-Dusedtrace>
-and if calling C<dtrace> actually lets you instrument code. This
-generally requires being run as root, so this test file is primarily
-intended for use by the dtrace subcommittee of p5p.
+XXX
=back
[ Within the sections, list each platform as a =item entry with specific
changes as paragraphs below it. ]
+=over 4
+
+=item HP-UX PA-RISC/64 now supports gcc-4.x
+
+A fix to correct the socketsize now makes the test suite pass on HP-UX
+PA-RISC for 64bitall builds.
+
+=back
+
=head2 New Platforms
XXX List any platforms that this version of perl compiles on, that previous
=item *
-XXX
+F<embedvar.h> has been simplified, and one level of macro indirection for
+PL_* variables has been removed for the default (non-multiplicity)
+configuration. PERLVAR*() macros now directly expand their arguments to
+tokens such as C<PL_defgv>, instead of expanding to C<PL_Idefgv>, with
+F<embedvar.h> defining a macro to map C<PL_Idefgv> to C<PL_defgv>. XS code
+which has unwarranted chumminess with the implementation may need updating.
=back
=item *
-Applying the :lvalue attribute to subroutine that is already defined does
-not work properly, as the attribute changes the way the sub is compiled.
-Hence, Perl 5.12 began warning when an attempt is made to apply the
-attribute to an already defined sub. In such cases, the attribute is
-discarded.
-
-But the change in 5.12 missed the case where custom attributes are also
-present: that case still silently and ineffectively applied the attribute.
-That omission has now been corrected. C<sub foo :lvalue :Whatever> (when
-C<foo> is already defined) now warns about the :lvalue attribute, and does
-not apply it.
+Locking a subroutine (via C<lock &sub>) is no longer a compile-time error
+for regular subs. For lvalue subroutines, it no longer tries to return the
+sub as a scalar, resulting in strange side effects like C<ref \$_>
+returning "CODE" in some instances.
-L<attributes.pm|attributes> has likewise been updated to warn and not apply
-the attribute.
+C<lock &sub> is now a run-time error if L<threads::shared> is loaded (a
+no-op otherwise), but that may be rectified in a future version.
=item *
-=for comment
-Not necessary for perl5160delta
-
-The remaining discrepancies between explicit and implicit return from
-lvalue subroutines have been resolved. They mainly involved which error
-message to display when a read-only value is returned in lvalue context.
-Also, returning a PADTMP (the result of most built-ins, like C<index>) in
-lvalue context is now forbidden for explicit return, as it always has been
-for implicit return. This is not a regression from 5.14, as all the cases
-in which it could happen where previously syntax errors.
+The prototypes of several built-in functions--C<getprotobynumber>, C<lock>,
+C<not> and C<select>--have been corrected, or at least are now closer to
+reality than before.
=item *
-=for comment
-Not necessary for perl5160delta
-
-Explicitly returning a tied C<my> variable from an lvalue subroutine in
-list lvalue context used to clear the variable before the assignment could
-happen. This is something that was missed when explicit return was made to
-work in 5.15.0.
+Most dereferencing operators (C<${}>, etc.) used to call C<FETCH> twice on
+a tied operand when doing a symbolic dereference (looking up a variable by
+name, which is not permitted under C<use strict 'refs'>). Only C<&{}> did
+not have this problem. This has been fixed.
=item *
-=for comment
-Not necessary for perl5160delta
-
-A minor memory leak, introduced in 5.15.0, has been fixed. It would occur
-when a hash is freed that has had its current iterator deleted
-[perl #93454].
+A minor regression introduced in 5.15.0 has been fixed. Dereferencing a
+magical mortal (e.g., the return value of C<delete> on a tied hash element)
+explicitly returned from a subroutine called recursively was not calling
+C<FETCH>. This would affect code like C<@{ foo() }> where the C<foo> sub
+contains C<return delete $hash{elem}> and is calling itself.
=item *
-The C<prototype> function now returns a prototype (the empty string) for
-the C<__FILE__>, C<__LINE__> and C<__PACKAGE__> directives, instead of
-dying, as they are indistinguishable syntactically from nullary functions
-like C<time>.
+A panic involving the combination of the regular expression modifiers
+C</aa> and the C<\b> escape sequence introduced in 5.14.0 has been
+fixed [perl #95964].
=item *
-A bug affecting lvalue context propagation through nested lvalue subroutine
-calls has been fixed. Previously, returning a value in nested rvalue
-context would be treated as lvalue context by the inner subroutine call,
-resulting in some values (such as read-only values) being rejected.
+stat() would always return the inode number as an IV, even when the
+original was unsigned, or too large to fit in an IV. stat() now
+returns the inode number as the type that would best preserve the
+original value. [perl #84590]
=item *
-Some core bugs affecting L<Hash::Util> have been fixed: locking a hash
-element that is a glob copy no longer causes subsequent assignment to it to
-corrupt the glob, and unlocking a hash element that holds a copy-on-write
-scalar no longer causes modifications to that scalar to modify other
-scalars that were sharing the same string buffer.
+The combination of the regular expression modifiers C</aa> and the C<\b>
+and C<\B> escape sequences did not work properly on UTF-8 encoded
+strings. All non-ASCII characters under C</aa> should be treated as
+non-word characters, but what was happening was that Unicode rules were
+used to determine wordness/non-wordness for non-ASCII characters. This
+is now fixed [perl #95968].
=item *
-C<when> blocks are now capable of returning variables declared inside the
-enclosing C<given> block [perl #93548].
+Infinite loops like C<1 while 1> used to stop C<strict 'subs'> mode from
+working for the rest of the block.t
=item *
-A problem with context propagation when a C<do> block is an argument to
-C<return> has been fixed. It used to cause undefined to be returned in
-some cases of a C<return> inside an C<if> block which itself is followed by
-another C<return>.
+The C<\h>, C<\H>, C<\v> and C<\V> regular expression metacharacters used to
+cause a panic error message when attempting to match at the end of the
+string [perl #96354].
=item *
-Calling C<index> with a tainted constant no longer causes constants in
-subsequently compiled code to become tainted [perl #64804].
+For list assignments like C<($a,$b) = ($b,$a)>, Perl has to make a copy of
+the items on the right-hand side before assignment them to the left. For
+efficiency's sake, it assigns the values on the right straight to the items
+on the left no variable is mentioned on both sides, as in
+C<($a,$b) = ($c,$d)>. The logic for determining when it can cheat was
+faulty, in that C<&&> and C<||> on the right-hand side could fool it. So
+C<($a,$b) = $some_true_value && ($b,$a)> would end up assigning the value
+of C<$b> to both scalars.
=item *
-The C<SvIsCOW> C macro now returns false for read-only copies of typeglobs,
-such as those created by:
+Perl no longer tries to apply lvalue context to the string in
+C<("string", $variable) ||= 1> (which used to be an error). Since the
+left-hand side of C<||=> is evaluated in scalar context, that's a scalar
+comma operator, which gives all but the last item void context. There is
+no such thing as void lvalue context, so it was a mistake for Perl to try
+to force it [perl #96942].
- $hash{elem} = *foo;
- Hash::Util::lock_value %hash, 'elem';
+=item *
-It used to return true.
+Every subroutine has a filename associated with it, that the debugger uses.
+The one associated with constant subroutines used to be misallocated when
+cloned under threads. Consequently, debugging threaded applications could
+result in memory corruption [perl #96126].
=back
=head1 Acknowledgements
-XXX The list of people to thank goes here.
+XXX Generate this with:
+
+ perl Porting/acknowledgements.pl v5.15.1..HEAD
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / blobdiff