X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperldelta.pod;h=4ec71c8eb55ae8e51be7af4b985d529df28c4289;hb=f4dad39ef1a76c1f6bbf6733d7c2ee209381be78;hp=cf6036ff026d6a0fff4a884a0b229631549625a5;hpb=2ae324a7ad5d4e616e757c311984fd86d5857ddd;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index cf6036f..4ec71c8 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -1,1082 +1,27 @@
 =head1 NAME
 
-perldelta - what's new for perl5.004
+perldelta - what's new for perl5.005
 
 =head1 DESCRIPTION
 
-This document describes differences between the 5.003 release (as
-documented in I<Programming Perl>, second edition--the Camel Book) and
-this one.
+This document describes differences between the 5.004 release and this one.
 
-=head1 Supported Environments
-
-Perl5.004 builds out of the box on Unix, Plan9, LynxOS, VMS, OS/2,
-QNX, and AmigaOS.
+=head1 Incompatible Changes
 
 =head1 Core Changes
 
-Most importantly, many bugs were fixed.  See the F<Changes>
-file in the distribution for details.
-
-=head2 Compilation Option: Binary Compatibility With 5.003
-
-There is a new Configure question that asks if you want to maintain
-binary compatibility with Perl 5.003.  If you choose binary
-compatibility, you do not have to recompile your extensions, but you
-might have symbol conflicts if you embed Perl in another application,
-just as in the 5.003 release.  By default, binary compatibility
-is preserved at the expense of symbol table pollution.
-
-=head2 Subroutine Parameters Are Not Autovivified
-
-In Perl versions 5.002 and 5.003, array and hash elements used as
-subroutine parameters were "autovivified"; that is, they were brought
-into existence if they did not already exist.  For example, calling
-C<func($h{foo})> would create C<$h{foo}> if it did not already exist,
-causing C<exists $h{foo}> to become true and C<keys %h> to return
-C<('foo')>.
-
-Perl 5.004 returns to the pre-5.002 behavior of I<not> autovivifying
-array and hash elements used as subroutine parameters.
-
-=head2 Fixed Parsing of $$<digit>, &$<digit>, etc.
-
-A bug in previous versions of Perl 5.0 prevented proper parsing of
-numeric special variables as symbolic references.  That bug has been
-fixed.  As a result, the string "$$0" is no longer equivalent to
-C<$$."0">, but rather to C<${$0}>.  To get the old behavior, change
-"$$" followed by a digit to "${$}".
-
-=head2 Changes to Tainting Checks
-
-A bug in previous versions may have failed to detect some insecure
-conditions when taint checks are turned on. (Taint checks are used
-in setuid or setgid scripts, or when explicitly turned on with the
-C<-T> invocation option.) Although it's unlikely, this may cause a
-previously-working script to now fail -- which should be construed
-as a blessing, since that indicates a potentially-serious security
-hole was just plugged.
-
-=head2 New Opcode Module and Revised Safe Module
-
-A new Opcode module supports the creation, manipulation and
-application of opcode masks.  The revised Safe module has a new API
-and is implemented using the new Opcode module.  Please read the new
-Opcode and Safe documentation.
-
-=head2 Internal Change: FileHandle Class Based on IO::* Classes
-
-File handles are now stored internally as type IO::Handle.  The
-FileHandle module is still supported for backwards compatibility, but
-it is now merely a front end to the IO::* modules -- specifically,
-IO::Handle, IO::Seekable, and IO::File.  We suggest, but do not
-require, that you use the IO::* modules in new code.
-
-In harmony with this change, C<*GLOB{FILEHANDLE}> is now a
-backward-compatible synonym for C<*STDOUT{IO}>.
-
-=head2 Internal Change: PerlIO internal IO abstraction interface
-
-It is now possible to build Perl with AT&T's sfio IO package
-instead of stdio.  See L<perlapio> for more details, and
-the F<INSTALL> file for how to use it.
-
-=head2 New and Changed Built-in Variables
-
-=over
-
-=item $^E
-
-Extended error message on some platforms.  (Also known as
-$EXTENDED_OS_ERROR if you C<use English>).
-
-=item $^H
-
-The current set of syntax checks enabled by C<use strict>.  See the
-documentation of C<strict> for more details.  Not actually new, but
-newly documented.
-Because it is intended for internal use by Perl core components,
-there is no C<use English> long name for this variable.
-
-=item $^M
-
-By default, running out of memory it is not trappable.  However, if
-compiled for this, Perl may use the contents of C<$^M> as an emergency
-pool after die()ing with this message.  Suppose that your Perl were
-compiled with -DEMERGENCY_SBRK and used Perl's malloc.  Then
-
-    $^M = 'a' x (1<<16);
-
-would allocate a 64K buffer for use when in emergency.
-See the F<INSTALL> file for information on how to enable this option.
-As a disincentive to casual use of this advanced feature,
-there is no C<use English> long name for this variable.
-
-=back
-
-=head2 New and Changed Built-in Functions
-
-=over
-
-=item delete on slices
-
-This now works.  (e.g. C<delete @ENV{'PATH', 'MANPATH'}>)
-
-=item flock
-
-is now supported on more platforms, and prefers fcntl
-to lockf when emulating.
-
-=item printf and sprintf
-
-now support "%i" as a synonym for "%d", and the "h" modifier.
-So "%hi" means "short integer in decimal", and "%ho" means
-"unsigned short integer as octal".
-
-=item keys as an lvalue
-
-As an lvalue, C<keys> allows you to increase the number of hash buckets
-allocated for the given hash.  This can gain you a measure of efficiency if
-you know the hash is going to get big.  (This is similar to pre-extending
-an array by assigning a larger number to $#array.)  If you say
-
-    keys %hash = 200;
-
-then C<%hash> will have at least 200 buckets allocated for it.  These
-buckets will be retained even if you do C<%hash = ()>; use C<undef
-%hash> if you want to free the storage while C<%hash> is still in scope.
-You can't shrink the number of buckets allocated for the hash using
-C<keys> in this way (but you needn't worry about doing this by accident,
-as trying has no effect).
-
-=item my() in Control Structures
-
-You can now use my() (with or without the parentheses) in the control
-expressions of control structures such as:
-
-    while (defined(my $line = <>)) {
-        $line = lc $line;
-    } continue {
-        print $line;
-    }
-
-    if ((my $answer = <STDIN>) =~ /^y(es)?$/i) {
-        user_agrees();
-    } elsif ($answer =~ /^n(o)?$/i) {
-        user_disagrees();
-    } else {
-        chomp $answer;
-        die "`$answer' is neither `yes' nor `no'";
-    }
-
-Also, you can declare a foreach loop control variable as lexical by
-preceding it with the word "my".  For example, in:
-
-    foreach my $i (1, 2, 3) {
-        some_function();
-    }
-
-$i is a lexical variable, and the scope of $i extends to the end of
-the loop, but not beyond it.
-
-Note that you still cannot use my() on global punctuation variables
-such as $_ and the like.
-
-=item unpack() and pack()
-
-A new format 'w' represents a BER compressed integer (as defined in
-ASN.1).  Its format is a sequence of one or more bytes, each of which
-provides seven bits of the total value, with the most significant
-first.  Bit eight of each byte is set, except for the last byte, in
-which bit eight is clear.
-
-=item use VERSION
-
-If the first argument to C<use> is a number, it is treated as a version
-number instead of a module name.  If the version of the Perl interpreter
-is less than VERSION, then an error message is printed and Perl exits
-immediately.  Because C<use> occurs at compile time, this check happens
-immediately during the compilation process, unlike C<require VERSION>,
-which waits until run-time for the check.  This is often useful if you
-need to check the current Perl version before C<use>ing library modules
-which have changed in incompatible ways from older versions of Perl.
-(We try not to do this more than we have to.)
-
-=item use Module VERSION LIST
-
-If the VERSION argument is present between Module and LIST, then the
-C<use> will call the VERSION method in class Module with the given
-version as an argument.  The default VERSION method, inherited from
-the Universal class, croaks if the given version is larger than the
-value of the variable $Module::VERSION.  (Note that there is not a
-comma after VERSION!)
-
-This version-checking mechanism is similar to the one currently used
-in the Exporter module, but it is faster and can be used with modules
-that don't use the Exporter.  It is the recommended method for new
-code.
-
-=item prototype(FUNCTION)
-
-Returns the prototype of a function as a string (or C<undef> if the
-function has no prototype).  FUNCTION is a reference to or the name of the
-function whose prototype you want to retrieve.
-(Not actually new; just never documented before.)
-
-=item srand
-
-The default seed for C<srand>, which used to be C<time>, has been changed.
-Now it's a heady mix of difficult-to-predict system-dependent values,
-which should be sufficient for most everyday purposes.
-
-Previous to version 5.004, calling C<rand> without first calling C<srand>
-would yield the same sequence of random numbers on most or all machines.
-Now, when perl sees that you're calling C<rand> and haven't yet called
-C<srand>, it calls C<srand> with the default seed. You should still call
-C<srand> manually if your code might ever be run on a pre-5.004 system,
-of course, or if you want a seed other than the default.
-
-=item $_ as Default
-
-Functions documented in the Camel to default to $_ now in
-fact do, and all those that do are so documented in L<perlfunc>.
-
-=item C<m//g> does not trigger a pos() reset on failure
-
-The C<m//g> match iteration construct used to reset the iteration
-when it failed to match (so that the next C<m//g> match would start at
-the beginning of the string).  You now have to explicitly do a
-C<pos $str = 0;> to reset the "last match" position, or modify the
-string in some way.  This change makes it practical to chain C<m//g>
-matches together in conjunction with ordinary matches using the C<\G>
-zero-width assertion.  See L<perlop> and L<perlre>.
-
-=item nested C<sub{}> closures work now
-
-Prior to the 5.004 release, nested anonymous functions didn't work
-right.  They do now.
-
-=item formats work right on changing lexicals
-
-Just like anonymous functions that contain lexical variables
-that change (like a lexical index variable for a C<foreach> loop),
-formats now work properly.  For example, this silently failed
-before, and is fine now:
-
-    my $i;
-    foreach $i ( 1 .. 10 ) {
-	format =
-	my i is @#
-	$i
-    .
-	write;
-    }
-
-=back
-
-=head2 New Built-in Methods
-
-The C<UNIVERSAL> package automatically contains the following methods that
-are inherited by all other classes:
-
-=over
-
-=item isa(CLASS)
-
-C<isa> returns I<true> if its object is blessed into a sub-class of C<CLASS>
-
-C<isa> is also exportable and can be called as a sub with two arguments. This
-allows the ability to check what a reference points to. Example:
-
-    use UNIVERSAL qw(isa);
-
-    if(isa($ref, 'ARRAY')) {
-       ...
-    }
-
-=item can(METHOD)
-
-C<can> checks to see if its object has a method called C<METHOD>,
-if it does then a reference to the sub is returned; if it does not then
-I<undef> is returned.
-
-=item VERSION( [NEED] )
-
-C<VERSION> returns the version number of the class (package).  If the
-NEED argument is given then it will check that the current version (as
-defined by the $VERSION variable in the given package) not less than
-NEED; it will die if this is not the case.  This method is normally
-called as a class method.  This method is called automatically by the
-C<VERSION> form of C<use>.
-
-    use A 1.2 qw(some imported subs);
-    # implies:
-    A->VERSION(1.2);
-
-=back
-
-B<NOTE:> C<can> directly uses Perl's internal code for method lookup, and
-C<isa> uses a very similar method and caching strategy. This may cause
-strange effects if the Perl code dynamically changes @ISA in any package.
-
-You may add other methods to the UNIVERSAL class via Perl or XS code.
-You do not need to C<use UNIVERSAL> in order to make these methods
-available to your program.  This is necessary only if you wish to
-have C<isa> available as a plain subroutine in the current package.
-
-=head2 TIEHANDLE Now Supported
-
-See L<perltie> for other kinds of tie()s.
-
-=over
-
-=item TIEHANDLE classname, LIST
-
-This is the constructor for the class.  That means it is expected to
-return an object of some sort. The reference can be used to
-hold some internal information.
-
-    sub TIEHANDLE {
-	print "<shout>\n";
-	my $i;
-	return bless \$i, shift;
-    }
-
-=item PRINT this, LIST
-
-This method will be triggered every time the tied handle is printed to.
-Beyond its self reference it also expects the list that was passed to
-the print function.
-
-    sub PRINT {
-	$r = shift;
-	$$r++;
-	return print join( $, => map {uc} @_), $\;
-    }
-
-=item READ this LIST
-
-This method will be called when the handle is read from via the C<read>
-or C<sysread> functions.
-
-    sub READ {
-	$r = shift;
-	my($buf,$len,$offset) = @_;
-	print "READ called, \$buf=$buf, \$len=$len, \$offset=$offset";
-    }
-
-=item READLINE this
-
-This method will be called when the handle is read from. The method
-should return undef when there is no more data.
-
-    sub READLINE {
-	$r = shift;
-	return "PRINT called $$r times\n"
-    }
-
-=item GETC this
-
-This method will be called when the C<getc> function is called.
-
-    sub GETC { print "Don't GETC, Get Perl"; return "a"; }
-
-=item DESTROY this
-
-As with the other types of ties, this method will be called when the
-tied handle is about to be destroyed. This is useful for debugging and
-possibly for cleaning up.
-
-    sub DESTROY {
-	print "</shout>\n";
-    }
-
-=back
-
-=head2 Malloc Enhancements
-
-Four new compilation flags are recognized by malloc.c.  (They have no
-effect if perl is compiled with system malloc().)
-
-=over
-
-=item -DDEBUGGING_MSTATS
-
-If perl is compiled with C<DEBUGGING_MSTATS> defined, you can print
-memory statistics at runtime by running Perl thusly:
-
-  env PERL_DEBUG_MSTATS=2 perl your_script_here
-
-The value of 2 means to print statistics after compilation and on
-exit; with a value of 1, the statistics ares printed only on exit.
-(If you want the statistics at an arbitrary time, you'll need to
-install the optional module Devel::Peek.)
-
-=item -DEMERGENCY_SBRK
-
-If this macro is defined, running out of memory need not be a fatal
-error: a memory pool can allocated by assigning to the special
-variable C<$^M>.  See L<"$^M">.
-
-=item -DPACK_MALLOC
-
-Perl memory allocation is by bucket with sizes close to powers of two.
-Because of these malloc overhead may be big, especially for data of
-size exactly a power of two.  If C<PACK_MALLOC> is defined, perl uses
-a slightly different algorithm for small allocations (up to 64 bytes
-long), which makes it possible to have overhead down to 1 byte for
-allocations which are powers of two (and appear quite often).
-
-Expected memory savings (with 8-byte alignment in C<alignbytes>) is
-about 20% for typical Perl usage.  Expected slowdown due to additional
-malloc overhead is in fractions of a percent (hard to measure, because
-of the effect of saved memory on speed).
-
-=item -DTWO_POT_OPTIMIZE
-
-Similarly to C<PACK_MALLOC>, this macro improves allocations of data
-with size close to a power of two; but this works for big allocations
-(starting with 16K by default).  Such allocations are typical for big
-hashes and special-purpose scripts, especially image processing.
-
-On recent systems, the fact that perl requires 2M from system for 1M
-allocation will not affect speed of execution, since the tail of such
-a chunk is not going to be touched (and thus will not require real
-memory).  However, it may result in a premature out-of-memory error.
-So if you will be manipulating very large blocks with sizes close to
-powers of two, it would be wise to define this macro.
-
-Expected saving of memory is 0-100% (100% in applications which
-require most memory in such 2**n chunks); expected slowdown is
-negligible.
-
-=back
-
-=head2 Miscellaneous Efficiency Enhancements
-
-Functions that have an empty prototype and that do nothing but return
-a fixed value are now inlined (e.g. C<sub PI () { 3.14159 }>).
-
-Each unique hash key is only allocated once, no matter how many hashes
-have an entry with that key.  So even if you have 100 copies of the
-same hash, the hash keys never have to be re-allocated.
-
-=head1 Pragmata
-
-Four new pragmatic modules exist:
-
-=over
-
-=item use blib
-
-=item use blib 'dir'
-
-Looks for MakeMaker-like I<'blib'> directory structure starting in
-I<dir> (or current directory) and working back up to five levels of
-parent directories.
-
-Intended for use on command line with B<-M> option as a way of testing
-arbitrary scripts against an uninstalled version of a package.
-
-=item use locale
-
-Tells the compiler to enable (or disable) the use of POSIX locales for
-built-in operations.
-
-When C<use locale> is in effect, the current LC_CTYPE locale is used
-for regular expressions and case mapping; LC_COLLATE for string
-ordering; and LC_NUMERIC for numeric formating in printf and sprintf
-(but B<not> in print).  LC_NUMERIC is always used in write, since
-lexical scoping of formats is problematic at best.
-
-Each C<use locale> or C<no locale> affects statements to the end of
-the enclosing BLOCK or, if not inside a BLOCK, to the end of the
-current file.  Locales can be switched and queried with
-POSIX::setlocale().
-
-See L<perllocale> for more information.
-
-=item use ops
-
-Disable unsafe opcodes, or any named opcodes, when compiling Perl code.
-
-=item use vmsish
-
-Enable VMS-specific language features.  Currently, there are three
-VMS-specific features available: 'status', which makes C<$?> and
-C<system> return genuine VMS status values instead of emulating POSIX;
-'exit', which makes C<exit> take a genuine VMS status value instead of
-assuming that C<exit 1> is an error; and 'time', which makes all times
-relative to the local time zone, in the VMS tradition.
-
-=back
-
 =head1 Modules
 
-=head2 Installation Directories
-
-The I<installperl> script now places the Perl source files for
-extensions in the architecture-specific library directory, which is
-where the shared libraries for extensions have always been.  This
-change is intended to allow administrators to keep the Perl 5.004
-library directory unchanged from a previous version, without running
-the risk of binary incompatibility between extensions' Perl source and
-shared libraries.
-
-=head2 Fcntl
-
-New constants in the existing Fcntl modules are now supported,
-provided that your operating system happens to support them:
-
-    F_GETOWN F_SETOWN
-    O_ASYNC O_DEFER O_DSYNC O_FSYNC O_SYNC
-    O_EXLOCK O_SHLOCK
-
-These constants are intended for use with the Perl operators sysopen()
-and fcntl() and the basic database modules like SDBM_File.  For the
-exact meaning of these and other Fcntl constants please refer to your
-operating system's documentation for fcntl() and open().
-
-In addition, the Fcntl module now provides these constants for use
-with the Perl operator flock():
-
-	LOCK_SH LOCK_EX LOCK_NB LOCK_UN
-
-These constants are defined in all environments (because where there is
-no flock() system call, Perl emulates it).  However, for historical
-reasons, these constants are not exported unless they are explicitly
-requested with the ":flock" tag (e.g. C<use Fcntl ':flock'>).
-
-=head2 Module Information Summary
-
-Brand new modules, arranged by topic rather than strictly
-alphabetically:
-
-    CPAN                 interface to Comprehensive Perl Archive Network
-    CPAN::FirstTime      create a CPAN configuration file
-    CPAN::Nox            run CPAN while avoiding compiled extensions
-
-    IO.pm                Top-level interface to IO::* classes
-    IO/File.pm           IO::File extension Perl module
-    IO/Handle.pm         IO::Handle extension Perl module
-    IO/Pipe.pm           IO::Pipe extension Perl module
-    IO/Seekable.pm       IO::Seekable extension Perl module
-    IO/Select.pm         IO::Select extension Perl module
-    IO/Socket.pm         IO::Socket extension Perl module
-
-    Opcode.pm            Disable named opcodes when compiling Perl code
-
-    ExtUtils/Embed.pm    Utilities for embedding Perl in C programs
-    ExtUtils/testlib.pm  Fixes up @INC to use just-built extension
-
-    FindBin.pm           Find path of currently executing program
-
-    Class/Template.pm    Structure/member template builder
-    File/stat.pm         Object-oriented wrapper around CORE::stat
-    Net/hostent.pm       Object-oriented wrapper around CORE::gethost*
-    Net/netent.pm        Object-oriented wrapper around CORE::getnet*
-    Net/protoent.pm      Object-oriented wrapper around CORE::getproto*
-    Net/servent.pm       Object-oriented wrapper around CORE::getserv*
-    Time/gmtime.pm       Object-oriented wrapper around CORE::gmtime
-    Time/localtime.pm    Object-oriented wrapper around CORE::localtime
-    Time/tm.pm           Perl implementation of "struct tm" for {gm,local}time
-    User/grent.pm        Object-oriented wrapper around CORE::getgr*
-    User/pwent.pm        Object-oriented wrapper around CORE::getpw*
+=head2 Required Updates
 
-    Tie/RefHash.pm       Base class for tied hashes with references as keys
-
-    UNIVERSAL.pm         Base class for *ALL* classes
-
-=head2 IO
-
-The IO module provides a simple mechanism to load all of the IO modules at one
-go.  Currently this includes:
-
-     IO::Handle
-     IO::Seekable
-     IO::File
-     IO::Pipe
-     IO::Socket
-
-For more information on any of these modules, please see its
-respective documentation.
-
-=head2 Math::Complex
-
-The Math::Complex module has been totally rewritten, and now supports
-more operations.  These are overloaded:
-
-     + - * / ** <=> neg ~ abs sqrt exp log sin cos atan2 "" (stringify)
-
-And these functions are now exported:
-
-    pi i Re Im arg
-    log10 logn cbrt root
-    tan cotan asin acos atan acotan
-    sinh cosh tanh cotanh asinh acosh atanh acotanh
-    cplx cplxe
-
-=head2 DB_File
-
-There have been quite a few changes made to DB_File. Here are a few of
-the highlights:
-
-=over
-
-=item *
-
-Fixed a handful of bugs.
-
-=item *
-
-By public demand, added support for the standard hash function exists().
-
-=item *
-
-Made it compatible with Berkeley DB 1.86.
-
-=item *
-
-Made negative subscripts work with RECNO interface.
-
-=item *
-
-Changed the default flags from O_RDWR to O_CREAT|O_RDWR and the default
-mode from 0640 to 0666.
-
-=item *
-
-Made DB_File automatically import the open() constants (O_RDWR,
-O_CREAT etc.) from Fcntl, if available.
-
-=item *
-
-Updated documentation.
-
-=back
-
-Refer to the HISTORY section in DB_File.pm for a complete list of
-changes. Everything after DB_File 1.01 has been added since 5.003.
-
-=head2 Net::Ping
-
-Major rewrite - support added for both udp echo and real icmp pings.
-
-=head2 Overridden Built-ins
-
-Many of the Perl built-ins returning lists now have
-object-oriented overrides.  These are:
-
-    File::stat
-    Net::hostent
-    Net::netent
-    Net::protoent
-    Net::servent
-    Time::gmtime
-    Time::localtime
-    User::grent
-    User::pwent
-
-For example, you can now say
-
-    use File::stat;
-    use User::pwent;
-    $his = (stat($filename)->st_uid == pwent($whoever)->pw_uid);
+    XXX Any???
 
 =head1 Utility Changes
 
-=head2 xsubpp
-
-=over
-
-=item C<void> XSUBs now default to returning nothing
-
-Due to a documentation/implementation bug in previous versions of
-Perl, XSUBs with a return type of C<void> have actually been
-returning one value.  Usually that value was the GV for the XSUB,
-but sometimes it was some already freed or reused value, which would
-sometimes lead to program failure.
-
-In Perl 5.004, if an XSUB is declared as returning C<void>, it
-actually returns no value, i.e. an empty list (though there is a
-backward-compatibility exception; see below).  If your XSUB really
-does return an SV, you should give it a return type of C<SV *>.
-
-For backward compatibility, I<xsubpp> tries to guess whether a
-C<void> XSUB is really C<void> or if it wants to return an C<SV *>.
-It does so by examining the text of the XSUB: if I<xsubpp> finds
-what looks like an assignment to C<ST(0)>, it assumes that the
-XSUB's return type is really C<SV *>.
-
-=back
-
 =head1 C Language API Changes
 
-=over
-
-=item C<gv_fetchmethod> and C<perl_call_sv>
-
-The C<gv_fetchmethod> function finds a method for an object, just like
-in Perl 5.003.  The GV it returns may be a method cache entry.
-However, in Perl 5.004, method cache entries are not visible to users;
-therefore, they can no longer be passed directly to C<perl_call_sv>.
-Instead, you should use the C<GvCV> macro on the GV to extract its CV,
-and pass the CV to C<perl_call_sv>.
-
-The most likely symptom of passing the result of C<gv_fetchmethod> to
-C<perl_call_sv> is Perl's producing an "Undefined subroutine called"
-error on the I<second> call to a given method (since there is no cache
-on the first call).
-
-=item Extended API for manipulating hashes
-
-Internal handling of hash keys has changed.  The old hashtable API is
-still fully supported, and will likely remain so.  The additions to the
-API allow passing keys as C<SV*>s, so that C<tied> hashes can be given
-real scalars as keys rather than plain strings (non-tied hashes still
-can only use strings as keys).  New extensions must use the new hash
-access functions and macros if they wish to use C<SV*> keys.  These
-additions also make it feasible to manipulate C<HE*>s (hash entries),
-which can be more efficient.  See L<perlguts> for details.
-
-=back
-
 =head1 Documentation Changes
 
-Many of the base and library pods were updated.  These
-new pods are included in section 1:
-
-=over
-
-=item L<perldelta>
-
-This document.
-
-=item L<perllocale>
-
-Locale support (internationalization and localization).
-
-=item L<perltoot>
-
-Tutorial on Perl OO programming.
-
-=item L<perlapio>
-
-Perl internal IO abstraction interface.
-
-=item L<perldebug>
-
-Although not new, this has been massively updated.
-
-=item L<perlsec>
-
-Although not new, this has been massively updated.
-
-=back
-
-=head1 New Diagnostics
-
-Several new conditions will trigger warnings that were
-silent before.  Some only affect certain platforms.
-The following new warnings and errors outline these.
-These messages are classified as follows (listed in
-increasing order of desperation):
-
-   (W) A warning (optional).
-   (D) A deprecation (optional).
-   (S) A severe warning (mandatory).
-   (F) A fatal error (trappable).
-   (P) An internal error you should never see (trappable).
-   (X) A very fatal error (non-trappable).
-   (A) An alien error message (not generated by Perl).
-
-=over
-
-=item "my" variable %s masks earlier declaration in same scope
-
-(S) A lexical variable has been redeclared in the same scope, effectively
-eliminating all access to the previous instance.  This is almost always
-a typographical error.  Note that the earlier variable will still exist
-until the end of the scope or until all closure referents to it are
-destroyed.
-
-=item %s argument is not a HASH element or slice
-
-(F) The argument to delete() must be either a hash element, such as
-
-    $foo{$bar}
-    $ref->[12]->{"susie"}
-
-or a hash slice, such as
-
-    @foo{$bar, $baz, $xyzzy}
-    @{$ref->[12]}{"susie", "queue"}
-
-=item Allocation too large: %lx
-
-(X) You can't allocate more than 64K on an MSDOS machine.
-
-=item Allocation too large
-
-(F) You can't allocate more than 2^31+"small amount" bytes.
-
-=item Attempt to free non-existent shared string
-
-(P) Perl maintains a reference counted internal table of strings to
-optimize the storage and access of hash keys and other strings.  This
-indicates someone tried to decrement the reference count of a string
-that can no longer be found in the table.
-
-=item Attempt to use reference as lvalue in substr
-
-(W) You supplied a reference as the first argument to substr() used
-as an lvalue, which is pretty strange.  Perhaps you forgot to
-dereference it first.  See L<perlfunc/substr>.
-
-=item Unsupported function fork
-
-(F) Your version of executable does not support forking.
-
-Note that under some systems, like OS/2, there may be different flavors of
-Perl executables, some of which may support fork, some not. Try changing
-the name you call Perl by to C<perl_>, C<perl__>, and so on.
-
-=item Ill-formed logical name |%s| in prime_env_iter
-
-(W) A warning peculiar to VMS.  A logical name was encountered when preparing
-to iterate over %ENV which violates the syntactic rules governing logical
-names.  Since it cannot be translated normally, it is skipped, and will not
-appear in %ENV.  This may be a benign occurrence, as some software packages
-might directly modify logical name tables and introduce non-standard names,
-or it may indicate that a logical name table has been corrupted.
-
-=item Can't use bareword ("%s") as %s ref while "strict refs" in use
-
-(F) Only hard references are allowed by "strict refs".  Symbolic references
-are disallowed.  See L<perlref>.
-
-=item Constant subroutine %s redefined
-
-(S) You redefined a subroutine which had previously been eligible for
-inlining.  See L<perlsub/"Constant Functions"> for commentary and
-workarounds.
-
-=item Died
-
-(F) You passed die() an empty string (the equivalent of C<die "">) or
-you called it with no args and both C<$@> and C<$_> were empty.
-
-=item Integer overflow in hex number
-
-(S) The literal hex number you have specified is too big for your
-architecture. On a 32-bit architecture the largest hex literal is
-0xFFFFFFFF.
-
-=item Integer overflow in octal number
-
-(S) The literal octal number you have specified is too big for your
-architecture. On a 32-bit architecture the largest octal literal is
-037777777777.
-
-=item Name "%s::%s" used only once: possible typo
-
-(W) Typographical errors often show up as unique variable names.
-If you had a good reason for having a unique name, then just mention
-it again somehow to suppress the message (the C<use vars> pragma is
-provided for just this purpose).
-
-=item Null picture in formline
-
-(F) The first argument to formline must be a valid format picture
-specification.  It was found to be empty, which probably means you
-supplied it an uninitialized value.  See L<perlform>.
-
-=item Offset outside string
-
-(F) You tried to do a read/write/send/recv operation with an offset
-pointing outside the buffer.  This is difficult to imagine.
-The sole exception to this is that C<sysread()>ing past the buffer
-will extend the buffer and zero pad the new area.
-
-=item Stub found while resolving method `%s' overloading `%s' in package `%s'
-
-(P) Overloading resolution over @ISA tree may be broken by importing stubs.
-Stubs should never be implicitely created, but explicit calls to C<can>
-may break this.
-
-=item Cannot resolve method `%s' overloading `%s' in package `s'
-
-(P) Internal error trying to resolve overloading specified by a method
-name (as opposed to a subroutine reference).
-
-=item Out of memory!
-
-(X|F) The malloc() function returned 0, indicating there was insufficient
-remaining memory (or virtual memory) to satisfy the request.
-
-The request was judged to be small, so the possibility to trap it
-depends on the way Perl was compiled.  By default it is not trappable.
-However, if compiled for this, Perl may use the contents of C<$^M> as
-an emergency pool after die()ing with this message.  In this case the
-error is trappable I<once>.
-
-=item Out of memory during request for %s
-
-(F) The malloc() function returned 0, indicating there was insufficient
-remaining memory (or virtual memory) to satisfy the request. However,
-the request was judged large enough (compile-time default is 64K), so
-a possibility to shut down by trapping this error is granted.
-
-=item Possible attempt to put comments in qw() list
-
-(W) qw() lists contain items separated by whitespace; as with literal
-strings, comment characters are not ignored, but are instead treated
-as literal data.  (You may have used different delimiters than the
-exclamation marks parentheses shown here; braces are also frequently
-used.)
-
-You probably wrote something like this:
-
-    @list = qw(
-        a # a comment
-        b # another comment
-    );
-
-when you should have written this:
-
-    @list = qw(
-        a
-        b
-    );
-
-If you really want comments, build your list the
-old-fashioned way, with quotes and commas:
-
-    @list = (
-        'a',    # a comment
-        'b',    # another comment
-    );
-
-=item Possible attempt to separate words with commas
-
-(W) qw() lists contain items separated by whitespace; therefore commas
-aren't needed to separate the items. (You may have used different
-delimiters than the parentheses shown here; braces are also frequently
-used.)
-
-You probably wrote something like this:
-
-    qw! a, b, c !;
-
-which puts literal commas into some of the list items.  Write it without
-commas if you don't want them to appear in your data:
-
-    qw! a b c !;
-
-=item Scalar value @%s{%s} better written as $%s{%s}
-
-(W) You've used a hash slice (indicated by @) to select a single element of
-a hash.  Generally it's better to ask for a scalar value (indicated by $).
-The difference is that C<$foo{&bar}> always behaves like a scalar, both when
-assigning to it and when evaluating its argument, while C<@foo{&bar}> behaves
-like a list when you assign to it, and provides a list context to its
-subscript, which can do weird things if you're expecting only one subscript.
-
-=item untie attempted while %d inner references still exist
-
-(W) A copy of the object returned from C<tie> (or C<tied>) was still
-valid when C<untie> was called.
-
-=item Value of %s construct can be "0"; test with defined()
-
-(W) In a conditional expression, you used <HANDLE>, <*> (glob), or
-C<readdir> as a boolean value.  Each of these constructs can return a
-value of "0"; that would make the conditional expression false, which
-is probably not what you intended.  When using these constructs in
-conditional expressions, test their values with the C<defined> operator.
-
-=item Variable "%s" may be unavailable
-
-(W) An inner (nested) I<anonymous> subroutine is inside a I<named>
-subroutine, and outside that is another subroutine; and the anonymous
-(innermost) subroutine is referencing a lexical variable defined in
-the outermost subroutine.  For example:
-
-   sub outermost { my $a; sub middle { sub { $a } } }
-
-If the anonymous subroutine is called or referenced (directly or
-indirectly) from the outermost subroutine, it will share the variable
-as you would expect.  But if the anonymous subroutine is called or
-referenced when the outermost subroutine is not active, it will see
-the value of the shared variable as it was before and during the
-*first* call to the outermost subroutine, which is probably not what
-you want.
-
-In these circumstances, it is usually best to make the middle
-subroutine anonymous, using the C<sub {}> syntax.  Perl has specific
-support for shared variables in nested anonymous subroutines; a named
-subroutine in between interferes with this feature.
-
-=item Variable "%s" will not stay shared
-
-(W) An inner (nested) I<named> subroutine is referencing a lexical
-variable defined in an outer subroutine.
-
-When the inner subroutine is called, it will probably see the value of
-the outer subroutine's variable as it was before and during the
-*first* call to the outer subroutine; in this case, after the first
-call to the outer subroutine is complete, the inner and outer
-subroutines will no longer share a common value for the variable.  In
-other words, the variable will no longer be shared.
-
-Furthermore, if the outer subroutine is anonymous and references a
-lexical variable outside itself, then the outer and inner subroutines
-will I<never> share the given variable.
-
-This problem can usually be solved by making the inner subroutine
-anonymous, using the C<sub {}> syntax.  When inner anonymous subs that
-reference variables in outer subroutines are called or referenced,
-they are automatically re-bound to the current values of such
-variables.
-
-=item Warning: something's wrong
-
-(W) You passed warn() an empty string (the equivalent of C<warn "">) or
-you called it with no args and C<$_> was empty.
-
-=item Got an error from DosAllocMem
-
-(P) An error peculiar to OS/2.  Most probably you're using an obsolete
-version of Perl, and this should not happen anyway.
-
-=item Malformed PERLLIB_PREFIX
-
-(F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form
-
-    prefix1;prefix2
-
-or
-
-    prefix1 prefix2
-
-with non-empty prefix1 and prefix2. If C<prefix1> is indeed a prefix of
-a builtin library search path, prefix2 is substituted. The error may appear
-if components are not found, or are too long. See L<perlos2/"PERLLIB_PREFIX">.
-
-=item PERL_SH_DIR too long
-
-(F) An error peculiar to OS/2. PERL_SH_DIR is the directory to find the
-C<sh>-shell in. See L<perlos2/"PERL_SH_DIR">.
-
-=item Process terminated by SIG%s
-
-(W) This is a standard message issued by OS/2 applications, while *nix
-applications die in silence. It is considered a feature of the OS/2
-port. One can easily disable this by appropriate sighandlers, see
-L<perlipc/"Signals">.  See L<perlos2/"Process terminated by SIGTERM/SIGINT">.
-
-=back
-
 =head1 BUGS
 
 If you find what you think is a bug, you might check the headers of
@@ -1094,18 +39,10 @@ analysed by the Perl porting team.
 
 The F<Changes> file for exhaustive details on what changed.
 
-The F<INSTALL> file for how to build Perl.  This file has been
-significantly updated for 5.004, so even veteran users should
-look through it.
+The F<INSTALL> file for how to build Perl.
 
 The F<README> file for general stuff.
 
-The F<Copying> file for copyright information.
+The F<Artistic> and F<Copying> files for copyright information.
 
 =head1 HISTORY
-
-Constructed by Tom Christiansen, grabbing material with permission
-from innumerable contributors, with kibitzing by more than a few Perl
-porters.
-
-Last update: Sat Mar  8 19:51:26 EST 1997