=head1 NAME
-perldelta - what is new for perl v5.27.6
+perldelta - what is new for perl v5.27.8
=head1 DESCRIPTION
-This document describes differences between the 5.27.5 release and the 5.27.6
+This document describes differences between the 5.27.7 release and the 5.27.8
release.
-If you are upgrading from an earlier release such as 5.27.4, first read
-L<perl5275delta>, which describes differences between 5.27.4 and 5.27.5.
+If you are upgrading from an earlier release such as 5.27.6, first read
+L<perl5277delta>, which describes differences between 5.27.6 and 5.27.7.
=head1 Core Enhancements
-=head2 Initialisation of aggregate state variables
+=head2 Close-on-exec flag set atomically
-A persistent lexical array or hash variable can now be initialized,
-by an expression such as C<state @a = qw(x y z)>. Initialization of a
-list of persistent lexical variables is still not possible.
+When opening a file descriptor, perl now generally opens it with its
+close-on-exec flag already set, on platforms that support doing so.
+This improves thread safety, because it means that an C<exec> initiated
+by one thread can no longer cause a file descriptor in the process
+of being opened by another thread to be accidentally passed to the
+executed program.
-=head2 Full-size inode numbers
+Additionally, perl now sets the close-on-exec flag more reliably, whether
+it does so atomically or not. Most file descriptors were getting the
+flag set, but some were being missed.
-On platforms where inode numbers are of a type larger than perl's native
-integer numerical types, L<stat|perlfunc/stat> will preserve the full
-content of large inode numbers by returning them in the form of strings of
-decimal digits. Exact comparison of inode numbers can thus be achieved by
-comparing with C<eq> rather than C<==>. Comparison with C<==>, and other
-numerical operations (which are usually meaningless on inode numbers),
-work as well as they did before, which is to say they fall back to
-floating point, and ultimately operate on a fairly useless rounded inode
-number if the real inode number is too big for the floating point format.
+=head2 Mixed Unicode scripts are now detectable
-=head1 Incompatible Changes
-
-=head2 Yada-yada is now strictly a statement
+A mixture of scripts, such as Cyrillic and Latin, in a string is often
+the sign of a spoofing attack. A new regular expression construct
+now allows for easy detection of these. For example, you can say
-By the time of its initial stable release in Perl 5.12, the C<...>
-(yada-yada) operator was explicitly intended to serve as a statement,
-not an expression. However, the original implementation was confused
-on this point, leading to inconsistent parsing. The operator was
-accidentally accepted in a few situations where it did not serve as a
-complete statement, such as
+ qr/(?script_run: \d+ \b )/x
- ... . "foo";
- ... if $a < $b;
+And the digits matched will all be from the same set of 10. You won't
+get a look-alike digit from a different script that has a different
+value than what it appears to be.
-The parsing has now been made consistent, permitting yada-yada only as
-a statement. Affected code can use C<do{...}> to put a yada-yada into
-an arbitrary expression context.
+=head2 String- and number-specific bitwise ops are no longer experimental
-=head2 Subroutines no longer need typeglobs
+The new string-specific (C<&. |. ^. ~.>) and number-specific (C<& | ^ ~>)
+bitwise operators introduced in Perl 5.22 are no longer experimental.
+Because the number-specific ops are spelled the same way as the existing
+operators that choose their behaviour based on their operands, these
+operators must still be enabled via the "bitwise" feature, in either of
+these two ways:
-Perl 5.22.0 introduced an optimization allowing subroutines to be stored in
-packages as simple sub refs, not requiring a full typeglob (thus
-potentially saving large amounts of memeory). However, the optimization
-was flawed: it only applied to the main package.
+ use feature "bitwise";
-This optimization has now been extended to all packages. This may break
-compatibility with introspection code that looks inside stashes and expects
-everything in them to be a typeglob.
+ use v5.28; # "bitwise" now included
-When this optimization happens, the typeglob still notionally exists, so
-accessing it will cause the stash entry to be upgraded to a typeglob. The
-optimization does not apply to XSUBs or exported subroutines, and calling a
-method will undo it, since method calls cache things in typeglobs.
+They are also now enabled by the B<-E> command-line switch.
-(This change actually happened in perl 5.27.5 but was omitted from its perldelta.)
+The "bitwise" feature no longer emits a warning. Existing code that
+disables the "experimental::bitwise" warning category that the feature
+previously used will continue to work.
-[perl #129916] [perl #132252]
+One caveat that module authors ought to be aware of is that the numeric
+operators now pass a fifth TRUE argument to overload methods. Any methods
+that check the number of operands may croak if they do not expect so many.
+XS authors in particular should be aware that this:
-=head2 Sort algorithm can no longer be specified
+ SV *
+ bitop_handler (lobj, robj, swap)
-Since Perl 5.8, the L<sort> pragma has had subpragmata C<_mergesort>,
-C<_quicksort>, and C<_qsort> that can be used to specify which algorithm
-perl should use to implement the L<sort|perlfunc/sort> builtin.
-This was always considered a dubious feature that might not last,
-hence the underscore spellings, and they were documented as not being
-portable beyond Perl 5.8. These subpragmata have now been deleted,
-and any attempt to use them is an error. The L<sort> pragma otherwise
-remains, and the algorithm-neutral C<stable> subpragma can be used to
-control sorting behaviour.
-[perl #119635]
+may need to be changed to this:
-=head1 Performance Enhancements
+ SV *
+ bitop_handler (lobj, robj, swap, ...)
-=over 4
-
-=item *
+=head1 Incompatible Changes
-Many string concatenation expressions are now considerably faster, due
-to the introduction internally of a C<multiconcat> opcode which combines
-multiple concatenations, and optionally a C<=> or C<.=>, into a single
-action. For example, apart from retrieving C<$s>, C<$a> and C<$b>, this
-whole expression is now handled as a single op:
+=head2 Smartmatch and switch reversion
- $s .= "a=$a b=$b\n"
+The changes to the experimental smart match operator (C<~~>) and switch
+(C<given>/C<when>) constructs that were made in Perl 5.27.7 have been
+reverted due to the extent of the trouble caused to CPAN modules.
+It is expected that smartmatch will be changed again in the future,
+but preceded by some kind of explicit deprecation.
-As a special case, if the LHS of an assignment is a lexical variable or
-C<my $s>, the op itself handles retrieving the lexical variable, which
-is faster.
+=head1 Deprecations
-In general, the more the expression includes a mix of constant strings and
-variable expressions, the longer the expression, and the more it mixes
-together non-utf8 and utf8 strings, the more marked the performance
-improvement. For example on a C<x86_64> system, this code has been
-benchmarked running four times faster:
+=head2 Use of code points over 0xFF in string bitwise operators
- my $s;
- my $a = "ab\x{100}cde";
- my $b = "fghij";
- my $c = "\x{101}klmn";
+Some uses of these already are illegal after a previous deprecation
+cycle. This deprecates the remaining uses. See L<perldeprecation>.
- for my $i (1..10_000_000) {
- $s = "\x{100}wxyz";
- $s .= "foo=$a bar=$b baz=$c";
- }
+=head1 Performance Enhancements
-In addition, C<sprintf> expressions which have a constant format
-containing only C<%s> and C<%%> format elements, and which have a fixed
-number of arguments, are now also optimised into a C<multiconcat> op.
+=over 4
=item *
-Subroutines in packages no longer need to be stored in typeglobs, saving
-large amounts of memory. See L</Subroutines no longer need typeglobs>
-under L</Incompatible Changes>, above.
+The performance of pattern matching C<[[:ascii:]]> and C<[[:^ascii:]]>
+has been improved significantly except on EBCDIC platforms.
=back
=head1 Modules and Pragmata
-Key highlights in this release across several modules:
-
-=head2 Removal of use vars
-
-The usage of C<use vars> has been discouraged since the introduction of C<our> in
-Perl 5.6.0. Where possible the usage of this pragma has now been removed from
-the Perl source code.
-
-This had a slight effect (for the better) on the output of WARNING_BITS in B::Deparse.
-
-=head2 Use of DynaLoader changed to XSLoader in many modules
-
-XSLoader is more modern, and most modules already require perl 5.6 or greater, so
-no functionality is lost by switching. In some cases, we have also made changes to
-the local implementation that may not be reflected in the version on CPAN due
-to a desire to maintain more backwards compatibility.
-
-=head2 Updated Modules and Pragmata
+=head2 New Modules and Pragmata
=over 4
=item *
-L<Attribute::Handlers> has been upgraded from version 1.00 to 1.01.
-
-=item *
-
-L<attributes> has been upgraded from version 0.31 to 0.32.
-
-=item *
-
-L<B> has been upgraded from version 1.70 to 1.72.
-
-=item *
-
-L<B::Concise> has been upgraded from version 1.002 to 1.003.
-
-=item *
-
-L<B::Deparse> has been upgraded from version 1.43 to 1.45.
-
-=item *
-
-L<base> has been upgraded from version 2.26 to 2.27.
-
-=item *
-
-L<blib> has been upgraded from version 1.06 to 1.07.
-
-=item *
-
-L<Carp> has been upgraded from version 1.43 to 1.44.
-
-If a package on the call stack contains a constant named C<ISA>, Carp no
-longer throws a "Not a GLOB reference" error.
-
-=item *
-
-L<Compress::Raw::Zlib> has been upgraded from version 2.074 to 2.075.
-
-This addresses a security vulnerability in older versions of the 'zlib' library
-(which is bundled with Compress-Raw-Zlib).
-
-=item *
-
-L<Config::Extensions> has been upgraded from version 0.01 to 0.02.
-
-=item *
-
-L<Devel::PPPort> has moved from cpan-first to perl-first maintenance
-
-Primary responsibility for the code in Devel::PPPort has moved into core perl.
-In a practical sense there should be no change except that hopefully it will
-stay more up to date with changes made to symbols in perl, rather than needing
-to be updated after the fact.
-
-=item *
-
-L<DynaLoader> has been upgraded from version 1.42 to 1.44.
-
-=item *
-
-L<experimental> has been upgraded from version 0.016 to 0.017.
-
-=item *
-
-L<ExtUtils::CBuilder> has been upgraded from version 0.280228 to 0.280229.
-
-=item *
-
-L<ExtUtils::Embed> has been upgraded from version 1.34 to 1.35.
-
-=item *
-
-L<ExtUtils::Miniperl> has been upgraded from version 1.06 to 1.07.
-
-=item *
-
-L<ExtUtils::ParseXS> has been upgraded from version 3.35 to 3.36.
-
-=item *
-
-L<ExtUtils::Typemaps> has been upgraded from version 3.35 to 3.36.
-
-=item *
-
-L<ExtUtils::XSSymSet> has been upgraded from version 1.3 to 1.4.
-
-=item *
-
-L<fields> has been upgraded from version 2.23 to 2.24.
-
-=item *
-
-L<File::Copy> has been upgraded from version 2.32 to 2.33. It will now use
-Time::HiRes utime where available (perl #132401).
-
-=item *
-
-L<File::Spec> has been upgraded from version 3.68 to 3.70.
-
-=item *
-
-L<File::stat> has been upgraded from version 1.07 to 1.08.
-
-=item *
-
-L<FileCache> has been upgraded from version 1.09 to 1.10.
-
-=item *
-
-L<Filter::Simple> has been upgraded from version 0.94 to 0.95.
-
-=item *
-
-L<Hash::Util::FieldHash> has been upgraded from version 1.19 to 1.20.
-
-=item *
-
-L<I18N::Langinfo> has been upgraded from version 0.14 to 0.15.
-
-=item *
-
-L<I18N::LangTags> has been upgraded from version 0.42 to 0.43.
-
-=item *
-
-The libnet distribution has been upgraded from version 3.10 to 3.11.
-
-=item *
-
-L<Locale::Maketext> has been upgraded from version 1.28 to 1.29.
-
-=item *
-
-L<Module::CoreList> has been upgraded from version 5.20171020 to 5.20171120.
-
-=item *
-
-L<Net::Ping> has been upgraded from version 2.55 to 2.62.
+XXX Remove this section if not applicable.
-=item *
-
-L<ODBM_File> has been upgraded from version 1.14 to 1.15.
-
-=item *
-
-L<Opcode> has been upgraded from version 1.40 to 1.41.
-
-=item *
-
-L<Pod::Html> has been upgraded from version 1.2202 to 1.2203.
-
-=item *
-
-L<POSIX> has been upgraded from version 1.78 to 1.80.
-
-=item *
-
-L<re> has been upgraded from version 0.35 to 0.36.
-
-=item *
-
-L<SelfLoader> has been upgraded from version 1.24 to 1.25.
-
-=item *
-
-L<Socket> has been upgraded from version 2.020_03 to 2.020_04.
-
-=item *
-
-L<sort> has been upgraded from version 2.03 to 2.04.
-
-=item *
-
-L<Storable> has been upgraded from version 2.64 to 2.65.
-
-=item *
-
-L<Test> has been upgraded from version 1.30 to 1.31.
-
-=item *
-
-L<Test::Simple> has been upgraded from version 1.302103 to 1.302111.
-
-=item *
-
-L<threads> has been upgraded from version 2.18 to 2.19.
-
-=item *
-
-L<Tie::Array> has been upgraded from version 1.06 to 1.07.
-
-=item *
-
-L<Tie::StdHandle> has been upgraded from version 4.4 to 4.5.
-
-=item *
-
-L<Time::gmtime> has been upgraded from version 1.03 to 1.04.
+=back
-=item *
+=head2 Updated Modules and Pragmata
-L<Time::HiRes> has been upgraded from version 1.9746 to 1.9747.
+=over 4
=item *
-L<Time::localtime> has been upgraded from version 1.02 to 1.03.
-
-=item *
+L<XXX> has been upgraded from version A.xx to B.yy.
-L<Unicode::Collate> has been upgraded from version 1.19 to 1.23.
+If there was something important to note about this change, include that here.
=item *
-L<Unicode::Normalize> has been upgraded from version 1.25 to 1.26.
-
-=item *
+L<Unicode::UCD> has been upgraded from version 0.69 to 0.70.
-L<User::grent> has been upgraded from version 1.01 to 1.02.
+The function C<num> now accepts an optional parameter to help in
+diagnosing error returns.
=item *
-L<User::pwent> has been upgraded from version 1.00 to 1.01.
+L<XSLoader> has been upgraded from version 0.29 to 0.30.
-=item *
-
-L<VMS::DCLsym> has been upgraded from version 1.08 to 1.09.
+Platforms that use C<mod2fname> to edit the names of loadable libraries now look for
+bootstrap (.bs) files under the correct, non-edited name.
=item *
-L<VMS::Stdio> has been upgraded from version 2.42 to 2.44.
-
-=item *
+L<Socket> has been upgraded from version 2.020_04 to 2.027.
-L<warnings> has been upgraded from version 1.37 to 1.38.
+=back
-=item *
+=head2 Removed Modules and Pragmata
-L<XS::Typemap> has been upgraded from version 0.15 to 0.16.
+=over 4
=item *
-L<XSLoader> has been upgraded from version 0.27 to 0.28.
+XXX
=back
=head1 Documentation
+XXX Changes to files in F<pod/> go here. Consider grouping entries by
+file and be sure to link to the appropriate page, e.g. L<perlfunc>.
+
=head2 Changes to Existing Documentation
We have attempted to update the documentation to reflect the changes
Additionally, the following selected changes have been made:
+=head3 L<perlembed>
+
=over 4
-=item * L<perldiag/Variable length lookbehind not implemented in regex m/%s/>
+=item *
-This now gives more ideas as to workarounds to the issue that was
-introduced in Perl 5.18 (but not documented explicitly in its perldelta)
-for the fact that some Unicode C</i> rules cause a few sequences such as
+An example in L<perlembed> used the string value of C<ERRSV> as a
+format string when calling croak(). If that string contains format
+codes such as C<%s> this could crash the program.
- (?<!st)
+This has been changed to a call to croak_sv().
-to be considered variable length, and hence disallowed.
+An alternative could have been to supply a trivial format string:
-=item * "Use of state $_ is experimental" in L<perldiag>
+ croak("%s", SvPV_nolen(ERRSV));
-This entry has been removed, as the experimental support of this construct was
-removed in perl 5.24.0.
+or as a special case for C<ERRSV> simply:
-=item *
+ croak(NULL);
-The section on reference counting in L<perlguts> has been heavily revised,
-to describe references in the way a programmer needs to think about them
-rather than in terms of the physical data structures.
+=back
-=item *
+=head3 L<perlfunc>
-The section "Truth and Falsehood" in L<perlsyn> has been removed from
-that document, where it didn't belong, and merged into the existing
-paragraph on the same topic in L<perldata>.
+=over 4
=item *
-The description of the C<x> operator in L<perlop> has been clarified. [perl #132460]
+Improve the documentation of C<each> with a slightly more
+explicit description of the sharing of iterator state, and with
+caveats regarding the fragility of while-each loops. [perl #132644]
-=item *
+=back
+
+=head3 L<perlfunc>, L<perlop>, L<perlsyn>
-L<perluniprops> has been updated to note that C<\p{Word}> now includes
-code points matching the C<\p{Join_Control}> property. The change to
-the property was made in Perl 5.18, but not documented until now. There
-are currently only two code points that match this property U+200C (ZERO
-WIDTH NON-JOINER) and U+200D (ZERO WIDTH JOINER).
+=over 4
=item *
-The entry for C<$+> in perlvar has been expanded upon to describe handling of
-multiply-named capturing groups.
+Improve the documentation of while condition magic in various
+places. [perl #132644]
-=item *
+=back
-L<perlop> has been updated to note that C<qw>'s whitespace rules differ from that of
-C<split>'s in that only ASCII whitespace is used.
+=head3 L<perlrun>
+
+=over 4
=item *
-L<POSIX> has been updated with some more cautions about using locale-specific
-functions in threaded applications.
+Clarify the documentation of B<< -m >>. [perl #131518]
=back
including warnings and fatal error messages. For the complete list of
diagnostic messages, see L<perldiag>.
-=head2 Changes to Existing Diagnostics
+=head2 New Diagnostics
+
+=head3 New Errors
=over 4
=item *
-The diagnostic C<Initialization of state variables in list context
-currently forbidden> has changed to C<Initialization of state variables
-in list currently forbidden>, because list-context initialization of
-single aggregate state variables is now permitted.
+L<Can't "goto" into a binary or list expression|perldiag/"Can't E<quot>gotoE<quot> into a binary or list expression">
-=back
+Use of C<goto> to jump into the parameter of a binary or list operator has
+been prohibited, to prevent crashes and stack corruption. [perl #130936]
-=head1 Utility Changes
+=back
-=head2 L<perlbug>
+=head2 Changes to Existing Diagnostics
=over 4
=item *
-C<--help> and C<--version> options have been added.
+The C<< Unable to flush stdout >> error message was missing a trailing
+newline. [debian #875361]
=back
-=head1 Configuration and Compilation
-
-=over 4
-
-=item C89 requirement
-
-Perl has been documented as requiring a C89 compiler to build since October
-1998. A variety of simplifications have now been made to Perl's internals to
-rely on the features specified by the C89 standard. We believe that this
-internal change hasn't altered the set of platforms that Perl builds on, but
-please report a bug if Perl now has new problems building on your platform.
-
-=item New probes
+=head1 Testing
-=over 2
+Tests were added and changed to reflect the other additions and
+changes in this release. Furthermore, these significant changes were
+made:
-=item HAS_BUILTIN_ADD_OVERFLOW
-
-=item HAS_BUILTIN_MUL_OVERFLOW
-
-=item HAS_BUILTIN_SUB_OVERFLOW
-
-=item HAS_THREAD_SAFE_NL_LANGINFO_L
-
-=item HAS_LOCALECONV_L
-
-=item HAS_MBRLEN
-
-=item HAS_MBRTOWC
-
-=item HAS_MEMRCHR
-
-=item HAS_NANOSLEEP
+=over 4
-=item HAS_STRNLEN
+=item *
-=item HAS_STRTOLD_L
+Allow override of watchdog timer count in F<re/pat_psycho.t>.
-=item I_WCHAR
+This test can take a long time to run, so there is a timer to keep
+this in check (currently, 5 minutes). This commit adds checking
+the environment variable C<< PERL_TEST_TIME_OUT_FACTOR >>; if set,
+the time out setting is multiplied by its value.
=back
-=back
-
-=head1 Packaging
-
-For the past few years we have released perl using three different archive
-formats: bzip (C<.bz2>), LZMA2 (C<.xz>) and gzip (C<.gz>). Since xz compresses
-better and decompresses faster, and gzip is more compatible and uses less memory,
-we have dropped the C<.bz2> archive format with this release.
-(If this poses a problem, do let us know; see L</Reporting Bugs>, below.)
-
=head1 Platform Support
-=head2 Discontinued Platforms
+=head2 Platform-Specific Notes
=over 4
-=item PowerUX / Power MAX OS
+=item Cygwin
-Compiler hints and other support for these apparently long-defunct platforms has been removed.
+A build with the quadmath library can now be done on Cygwin.
-=back
+=item FreeBSD
-=head2 Platform-Specific Notes
+FreeBSD's F<< /usr/share/mk/sys.mk >> specifies C<< -O2 >> for
+architectures other than arm and mips. By default, compile perl
+with the same optimization levels.
-=over 4
+=item VMS
-=item Windows
+Several fix-ups for F<configure.com>, marking function VMS has
+(or doesn't have).
-Visual C++ compiler version detection has been improved to work on non-English
-language systems.
=back
=item *
-A new optimisation phase has been added to the compiler,
-C<optimize_optree()>, which does a top-down scan of a complete optree
-just before the peephole optimiser is run. This phase is not currently
-hookable.
-
-=item *
-
-An C<OP_MULTICONCAT> op has been added. At C<optimize_optree()> time, a
-chain of C<OP_CONCAT> and C<OP_CONST> ops, together optionally with an
-C<OP_STRINGIFY> and/or C<OP_SASSIGN>, are combined into a single
-C<OP_MULTICONCAT> op. The op is of type C<UNOP_AUX>, and the aux array
-contains the argument count, plus a pointer to a constant string and a set
-of segment lengths. For example with
-
- my $x = "foo=$foo, bar=$bar\n";
-
-the constant string would be C<"foo=, bar=\n"> and the segment lengths
-would be (4,6,1). If the string contains characters such as C<\x80>, whose
-representation changes under utf8, two sets of strings plus lengths are
-precomputed and stored.
-
-=item *
-
-Direct access to L<C<PL_keyword_plugin>|perlapi/PL_keyword_plugin> is not
-safe in the presence of multithreading. A new
-L<C<wrap_keyword_plugin>|perlapi/wrap_keyword_plugin> function has been
-added to allow XS modules to safely define custom keywords even when
-loaded from a thread, analogous to L<C<PL_check>|perlapi/PL_check> /
-L<C<wrap_op_checker>|perlapi/wrap_op_checker>.
+The format of the non-utf8 transliteration table attached to the C<op_pv>
+field of C<OP_TRANS>/C<OP_TRANSR> ops has changed. It's now a
+C<struct OPtrans_map>.
=back
=item *
-C<stat()>, C<lstat()>, and file test operators now fail if given a
-filename containing a nul character, in the same way that C<open()>
-already fails.
+The C<printf> format specifier C<%.0f> no longer rounds incorrectly
+[perl #47602], and now shows the correct sign for a negative zero.
=item *
-C<stat()>, C<lstat()>, and file test operators now reliably set C<$!> when
-failing due to being applied to a closed or otherwise invalid file handle.
+Fixed a use after free bug in pp_list introduced in 5.27.1. [perl #131954]
=item *
-File test operators for Unix permission bits that don't exist on a
-particular platform, such as C<-k> (sticky bit) on Windows, now check that
-the file being tested exists before returning the blanket false result,
-and yield the appropriate errors if the argument doesn't refer to a file.
+Don't stringify numeric first arguments to
+C<< system() >> on Windows or VMS. [perl #132633]
+
+=item *
+
+Fixed an issue where the error C<< Scalar value @arrayname[0] better
+written as $arrayname >> would give an error C<< Cannot printf Inf with 'c' >>
+when arrayname starts with C<< Inf >>. [perl #132645]
=item *
-The in-place reverse optimisation now correctly strengthens weak
-references using the L<C<sv_rvunweaken()>|perlapi/sv_rvunweaken>
-API function.
+The Perl implementation of C<< getcwd() >> in C<< Cwd >> in the PathTools
+distribution now behaves the same as XS implementation on errors: it
+returns an error, and sets C<< $! >>. [perl #132648]
=item *
-Fixed a read before buffer when parsing a range starting with C<\N{}>
-at the beginning of the character set for the transliteration
-operator. [perl #132245]
+Fixed argument counting in multiconcat when concatenating adjacent constants.
+[perl #132646]
=item *
-Fixed a leaked SV when parsing an empty C<\N{}> at compile-time.
-[perl #132245]
+Vivify array elements when putting them on the stack.
+Fixes [perl #8910] (reported in April 2002).
=item *
-Calling C<do $path> on a directory or block device now yields a meaningful
-error code in C<$!>. [perl #125774]
+Fixed parsing of braced subscript after parens. Fixes [perl #8045]
+(reported in December 2001).
=item *
-Regexp substitution using an overloaded replacement value that provides
-a tainted stringification now correctly taints the resulting string.
-[perl #115266]
+C<tr/non_utf8/long_non_utf8/c> could give the wrong results when the
+length of the replacement character list was greater than 0x7fff.
=item *
-Lexical sub declarations in C<do> blocks such as C<do { my sub lex; 123 }>
-could corrupt the stack, erasing items already on the stack in the
-enclosing statement. This has been fixed. [perl #132442]
+C<tr/non_utf8/non_utf8/cd> failed to add the implied
+C<\x{100}-\x{7fffffff}> to the search character list.
=back
-=head1 Errata From Previous Releases
+=head1 Known Problems
=over 4
=item *
-L</Subroutines no longer need typeglobs> under L</Incompatible Changes>, above,
-was made for perl 5.27.5 but was mistakenly omitted from its perldelta.
+The bugfix for [perl #2754] in Perl 5.27.7 turned out to cause so much
+trouble on CPAN [perl #132577] that it is being postponed. The bug has
+been restored, so C<exit(0)> in a C<UNITCHECK> or C<CHECK> block now
+once again permits the main program to run, and C<exit(0)> in a C<BEGIN>
+block once again permits C<INIT> blocks to run before exiting. The bug
+will be fixed again for Perl 5.30.
=back
XXX Generate this with:
- perl Porting/acknowledgements.pl v5.27.5..HEAD
+ perl Porting/acknowledgements.pl v5.27.7..HEAD
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / blobdiff