[inseparable changes from match from perl-5.003_94 to perl-5.003_95]

 CORE LANGUAGE CHANGES

Subject: Don't compile scalar mods of aggregates, like C<@a =~ s/a/b/>
From: Chip Salzenberg <chip@perl.com>
Files: op.c t/op/misc.t

Subject: Warn about undef magic values just like non-magic
From: Chip Salzenberg <chip@perl.com>
Files: ext/Opcode/Safe.pm sv.c t/lib/db-btree.t t/lib/db-hash.t t/lib/db-recno.t t/pragma/locale.t

 CORE PORTABILITY

Subject: Win32 update (five patches)
From: Gurusamy Sarathy <gsar@engin.umich.edu>
Files: MANIFEST README.win32 doio.c dosish.h pp_sys.c lib/ExtUtils/Command.pm t/comp/multiline.t t/op/magic.t t/op/mkdir.t t/op/runlevel.t t/op/stat.t t/op/write.t win32/Makefile win32/config.H win32/config.w32 win32/win32.c win32/win32.h win32/win32aux.c win32/*.mak win32/VC-2.0/*.mak

 DOCUMENTATION

Subject: INSTALL-1.8 to INSTALL-1.9 updates
Date: Tue, 25 Mar 1997 13:52:53 -0500 (EST)
From: Andy Dougherty <doughera@fractal.phys.lafayette.edu>
Files: INSTALL
Msg-ID: Pine.SOL.3.95q.970325135138.3374A-100000@fractal.lafayette.e

    (applied based on p5p patch as commit 9b1ae96a0b4301a9588f62b3175bc0312302f4b9)

Subject: Document possible problems with -Mdiagnostics after upgrade
From: Chip Salzenberg <chip@perl.com>
Files: INSTALL

Subject: Mention perldelta in INSTALL
From: Chip Salzenberg <chip@perl.com>
Files: INSTALL

Subject: Describe pod format at top of INSTALL
From: Chip Salzenberg <chip@perl.com>
Files: INSTALL

Subject: Document C</a *b/x> fix
From: Chip Salzenberg <chip@perl.com>
Files: pod/perldelta.pod

Subject: pods for subroutine argument autovivication
Date: Mon, 24 Mar 1997 07:25:21 +0000
From: "M.J.T. Guy" <mjtg@cus.cam.ac.uk>
Files: pod/perldelta.pod pod/perlsub.pod
Msg-ID: E0w9489-0005YT-00@ursa.cus.cam.ac.uk

    (applied based on p5p patch as commit db8878faa51a8a1541a40745a8613adb5db155e4)

Subject: Missing item in perldiag
Date: Sun, 23 Mar 1997 09:24:09 +0000
From: "M.J.T. Guy" <mjtg@cus.cam.ac.uk>
Files: pod/perldiag.pod
Msg-ID: E0w8jVZ-0005va-00@ursa.cus.cam.ac.uk

    (applied based on p5p patch as commit c00a529017138505fcbe538b74c7884abe1d18e1)

Subject: Pod problems & fixes
Date: Mon, 24 Mar 1997 21:31:51 +0100 (MET)
From: Hallvard B Furuseth <h.b.furuseth@usit.uio.no>
Files: INSTALL lib/Term/Complete.pm lib/subs.pm pod/perlcall.pod pod/perldata.pod pod/perldiag.pod pod/perlembed.pod pod/perlguts.pod pod/perlmod.pod pod/perlop.pod pod/perlpod.pod pod/pod2html.PL
Msg-ID: 199703242031.VAA14997@bombur2.uio.no

    (applied based on p5p patch as commit 55a864fe4cea1a0586891b83d359ba71e0972da5)

Subject: FAQ update
From: Nathan Torkington <gnat@prometheus.frii.com>
Files: pod/perlfaq*.pod

 OTHER CORE CHANGES

Subject: Improve 'prototype mismatch' warning
From: Chip Salzenberg <chip@perl.com>
Files: global.sym op.c pod/perldiag.pod proto.h sv.c t/comp/redef.t

1 files changed, 28 insertions, 9 deletions

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 958bee38ed..46bd59b04f 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -27,17 +27,29 @@ 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 No Autovivification of Subroutine Parameters
+=head2 Subroutine arguments created only when they're modified
 
-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')>.
+In Perl 5.004, nonexistent array and hash elements used as subroutine
+parameters are brought into existence only if they are actually
+assigned to (via C<@_>).
 
-Perl 5.004 returns to the pre-5.002 behavior of I<not> autovivifying
-array and hash elements used as subroutine parameters.
+Earlier versions of Perl vary in their handling of such arguments.
+Perl versions 5.002 and 5.003 always brought them into existence.
+Perl versions 5.000, 5.001, and 5.002 brought them into existence only
+if they were not the first argument (which was almost certainly a
+bug).  Earlier versions of Perl never brought them into existence.
+
+For example, given this code:
+
+     undef @a; undef %a;
+     sub show { print $_[0] };
+     sub change { $_[0]++ };
+     show($a[2]);
+     change($a{b});
+
+After this code executes in Perl 5.004, $a{b} exists but $a[2] does
+not.  In Perl 5.002 and 5.003, both $a{b} and $a[2] would have existed
+(but $a[2]'s value would have been undefined).
 
 =head2 Fixed Parsing of $$<digit>, &$<digit>, etc.
 
@@ -267,6 +279,13 @@ 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 C<m//x> ignores whitespace before ?*+{}
+
+The C<m//x> construct has always been intended to ignore all unescaped
+whitespace.  However, before Perl 5.004, whitespace had the effect of
+esacping repeat modifier like "*" or "?".  For example, C</a *b/x> was
+(mis)interpreted as C</a\*b/x>.  This bug has been fixed in 5.004.
+
 =item nested C<sub{}> closures work now
 
 Prior to the 5.004 release, nested anonymous functions didn't work