=over 4
+=item Treatment of list slices of undef has changed
+
+When taking a slice of a literal list (as opposed to a slice of
+an array or hash), Perl used to return an empty list if the
+result happened to be composed of all undef values.
+
+The new behavior is to produce an empty list if (and only if)
+the original list was empty. Consider the following example:
+
+ @a = (1,undef,undef,2)[2,1,2];
+
+The old behavior would have resulted in @a having no elements.
+The new behavior ensures it has three undefined elements.
+
+Note in particular that the behavior of slices of the following
+cases remains unchanged:
+
+ @a = ()[1,2];
+ @a = (getpwent)[7,0];
+ @a = (anything_returning_empty_list())[2,1,2];
+ @a = @b[2,1,2];
+ @a = @c{'a','b','c'};
+
+See L<perldata>.
+
=item Possibly changed pseudo-random number generator
In 5.005_0x and earlier, perl's rand() function used the C library
rand(3) function. As of 5.005_52, Configure tests for drand48(),
random(), and rand() (in that order) and picks the first one it finds.
Perl programs that depend on reproducing a specific set of pseudo-random
-numbers will now likely produce different output.
+numbers will now likely produce different output. You can use
+C<sh Configure -Drandfunc=rand> to obtain the old behavior.
=item Hashing function for hash keys has changed
creating references to the returned values.
Keys in the hash are still returned as copies when iterating on
-on a hash.
+a hash.
=item vec(EXPR,OFFSET,BITS) enforces powers-of-two BITS
-vec() generates a run-time error if the BITS arguments is not
+vec() generates a run-time error if the BITS argument is not
a valid power-of-two integer.
=item Text of some diagnostic output has changed
=head2 Long Doubles
Some platforms have "long doubles", floating point numbers of even
-larger range than ordinary "doubles". To enable using ng doubles for
+larger range than ordinary "doubles". To enable using long doubles for
Perl's scalars, use -Duselongdouble.
=head2 -Dusemorebits
=head2 SOCKS support
You can use "Configure -Dusesocks" which causes Perl to probe
-for the SOCKS proxy protocol library, http://www.socks.nec.com/
+for the SOCKS (v5, not v4) proxy protocol library,
+http://www.socks.nec.com/
=head2 C<-A> flag
hints files have been processed but before the actual configuration
process starts. Run C<Configure -h> to find out the full C<-A> syntax.
-=head2 New Installation Scheme
+=head2 Enhanced Installation Directories
-vendorprefix et al
-[TODO - Andy Dougherty <doughera@lafcol.lafayette.edu>]
+The installation structure has been enriched to improve the support for
+maintaining multiple versions of perl, to provide locations for
+vendor-supplied modules and scripts, and to ease maintenance of
+locally-added modules and scripts. See the section on Installation
+Directories in the INSTALL file for complete details. For most users
+building and installing from source, the defaults should be fine.
=head1 Core Changes
[TODO - Tuomas Lukka <lukka@fas.harvard.edu>]
+=head2 File globbing implemented internally
+
+WARNING: This is currently an experimental feature. Interfaces and
+implementation are likely to change.
+
+Perl can be compiled with -DPERL_INTERNAL_GLOB to use the File::Glob
+implementation of the glob() operator. This avoids using an external
+csh process and the problems associated with it.
+
=head2 Binary numbers supported
Binary numbers are now supported as literals, in s?printf formats, and
change#4052
[TODO - Ilya Zakharevich <ilya@math.ohio-state.edu>]
-=head2 Experimental support form user-hooks in @INC
+=head2 Experimental support for user-hooks in @INC
[TODO - Ken Fox <kfox@ford.com>]
=head2 New variable $^C reflects C<-c> switch
-C<$^C> contains a boolean that reflects whether perl is being run
+C<$^C> has a boolean value that reflects whether perl is being run
in compile-only mode (i.e. via the C<-c> switch). Since
BEGIN blocks are executed under such conditions, this variable
enables perl code to determine whether actions that make sense
The mechanism for reporting such errors has been reimplemented
to queue compile-time errors and report them at the end of the
compilation as true errors rather than as warnings. This fixes
-error messages that used to leak through as warnings when code
-was compiled at run time using C<eval STRING>, and allows such
-errors to be reliably trapped using __DIE__ hooks.
+cases where error messages leaked through in the form of warnings
+when code was compiled at run time using C<eval STRING>, and
+also allows such errors to be reliably trapped using __DIE__ hooks.
=head2 Automatic flushing of output buffers
since the exec() happened to be in a different process.
The child process now communicates with the parent about the
-error in launching the external command, which allow these
+error in launching the external command, which allows these
constructs to return with their usual error value and set $!.
=head2 Implicitly closed filehandles are safer
=head2 C<goto &sub> and AUTOLOAD
-C<goto &sub> construct works correctly when C<&sub> happens
+The C<goto &sub> construct works correctly when C<&sub> happens
to be autoloaded.
=head2 C<-bareword> allowed under C<use integer>
=head2 C<sort $coderef @foo> allowed
sort() did not accept a subroutine reference as the comparison
-function in earlier versions. This has been fixed.
+function in earlier versions. This is now permitted.
=head2 Failures in DESTROY()
=head2 Locale bugs fixed
-printf() and sprintf() previously did reset the numeric locale
+printf() and sprintf() previously reset the numeric locale
back to the default "C" locale. This has been fixed.
Numbers formatted according to the local numeric locale
Prior versions used to run BEGIN B<and> END blocks when Perl was
run in compile-only mode. Since this is typically not the expected
-behavior, END blocks are not executed when the C<-c> switch
+behavior, END blocks are not executed anymore when the C<-c> switch
is used.
Note that something resembling the previous behavior can still be
=head2 Other fixes for better diagnostics
-Line numbers are suppressed no more (under most likely circumstances)
+Line numbers are no longer suppressed (under most likely circumstances)
during the global destruction phase.
Diagnostics emitted from code running in threads other than the main
=head2 Simple sort() using { $a <=> $b } and the like are optimized
-Many common sort() opertions using a simple inlined block are now
+Many common sort() operations using a simple inlined block are now
optimized for faster performance.
=head2 Optimized assignments to lexical variables
The C<Shell> module is supported.
+Rudimentary support for building under command.com in Windows 95
+has been added.
+
[TODO - GSAR]
=head1 New tests
=item Dumpvalue
-Added Dumpvalue module provides screen dumps of Perl data.
+The Dumpvalue module provides screen dumps of Perl data.
=item Benchmark
File::Find now works correctly when the wanted() function is either
autoloaded or is a symbolic reference.
-A bug that cause File::Find to lose track of the working directory
+A bug that caused File::Find to lose track of the working directory
when pruning top-level directories has been fixed.
+=item File::Glob
+
+This extension implements BSD-style file globbing. It will also be
+used for the internal implementation of the glob() operator if
+Perl was compiled with -DPERL_INTERNAL_GLOB. See L<File::Glob>.
+
=item File::Spec
New methods have been added to the File::Spec module: devnull() returns
=item Getopt::Long
-[TODO - Johan Vromans <jvromans@squirrel.nl>]
+Getopt::Long licensing has changed to allow the Perl Artistic License
+as well as the GPL. It used to be GPL only, which got in the way of
+non-GPL applications that wanted to use Getopt::Long.
+
+Getopt::Long encourages the use of Pod::Usage to produce help
+messages. For example:
+
+ use Getopt::Long;
+ use Pod::Usage;
+ my $man = 0;
+ my $help = 0;
+ GetOptions('help|?' => \$help, man => \$man) or pod2usage(2);
+ pod2usage(1) if $help;
+ pod2usage(-exitstatus => 0, -verbose => 2) if $man;
+
+ __END__
+
+ =head1 NAME
+
+ sample - Using GetOpt::Long and Pod::Usage
+
+ =head1 SYNOPSIS
+
+ sample [options] [file ...]
+
+ Options:
+ -help brief help message
+ -man full documentation
+
+ =head1 OPTIONS
+
+ =over 8
+
+ =item B<-help>
+
+ Print a brief help message and exits.
+
+ =item B<-man>
+
+ Prints the manual page and exits.
+
+ =back
+
+ =head1 DESCRIPTION
+
+ B<This program> will read the given input file(s) and do someting
+ useful with the contents thereof.
+
+ =cut
+
+See L<Pod::Usage> for details.
+
+A bug that prevented the non-option call-back E<lt>E<gt> from being
+specified as the first argument has been fixed.
+
+To specify the characters E<lt> and E<gt> as option starters, use
+E<gt>E<lt>. Note, however, that changing option starters is strongly
+deprecated.
=item IO
Java Perl Lingo is now distributed with Perl. See jpl/README
for more information.
+=item lib
+
+C<use lib> now weeds out any trailing duplicate entries.
+C<no lib> removes all named entries.
+
=item Math::BigInt
-The logical operations C<E<lt>E<lt>>, C<E<gt>E<gt>>, C<&>, C<|>,
+The bitwise operations C<E<lt>E<lt>>, C<E<gt>E<gt>>, C<&>, C<|>,
and C<~> are now supported on bigints.
=item Math::Complex
=item Time::Local
The timelocal() and timegm() functions used to silently return bogus
-results when the date exceeded the machine's integer range. They
+results when the date fell outside the machine's integer range. They
now consistently croak() if the date falls in an unsupported range.
=item Win32
=head2 Pragmata
-C<use attrs> is now obsolescent, and is only provided for
+C<use attrs> is now obsolete, and is only provided for
backward-compatibility. It's been replaced by the C<sub : attributes>
syntax. See L<perlsub/"Subroutine Attributes"> and L<attributes>.
=over 4
+=item perlcompile.pod
+
+An introduction to using the Perl Compiler suite.
+
+=item perlhack.pod
+
+Some guidelines for hacking the Perl source code.
+
=item perlopentut.pod
A tutorial on using open() effectively.
A tutorial on managing class data for object modules.
-=item perlcompile.pod
-
-An introduction to using the Perl Compiler suite.
-
=back
=head1 New Diagnostics
+=over 4
+
=item "my sub" not yet implemented
(F) Lexically scoped subroutines are not yet implemented. Don't try that
yet.
+=item '!' allowed only after types %s
+
+(F) The '!' is allowed in pack() and unpack() only after certain types.
+See L<perlfunc/pack>.
+
+=item / cannot take a count
+
+(F) You had an unpack template indicating a counted-length string,
+but you have also specified an explicit size for the string.
+See L<perlfunc/pack>.
+
+=item / must be followed by a, A or Z
+
+(F) You had an unpack template indicating a counted-length string,
+which must be followed by one of the letters a, A or Z
+to indicate what sort of string is to be unpacked.
+See L<perlfunc/pack>.
+
+=item / must be followed by a*, A* or Z*
+
+(F) You had a pack template indicating a counted-length string,
+Currently the only things that can have their length counted are a*, A* or Z*.
+See L<perlfunc/pack>.
+
+=item / must follow a numeric type
+
+(F) You had an unpack template that contained a '#',
+but this did not follow some numeric unpack specification.
+See L<perlfunc/pack>.
+
+=item Repeat count in pack overflows
+
+(F) You can't specify a repeat count so large that it overflows
+your signed integers. See L<perlfunc/pack>.
+
+=item Repeat count in unpack overflows
+
+(F) You can't specify a repeat count so large that it overflows
+your signed integers. See L<perlfunc/unpack>.
+
+=item /%s/: Unrecognized escape \\%c passed through
+
+(W) You used a backslash-character combination which is not recognized
+by Perl. This combination appears in an interpolated variable or a
+C<'>-delimited regular expression.
+
+=item /%s/ should probably be written as "%s"
+
+(W) You have used a pattern where Perl expected to find a string,
+as in the first argument to C<join>. Perl will treat the true
+or false result of matching the pattern against $_ as the string,
+which is probably not what you had in mind.
+
+=item %s() called too early to check prototype
+
+(W) You've called a function that has a prototype before the parser saw a
+definition or declaration for it, and Perl could not check that the call
+conforms to the prototype. You need to either add an early prototype
+declaration for the subroutine in question, or move the subroutine
+definition ahead of the call to get proper prototype checking. Alternatively,
+if you are certain that you're calling the function correctly, you may put
+an ampersand before the name to avoid the warning. See L<perlsub>.
+
=item %s package attribute may clash with future reserved word: %s
(W) A lowercase attribute name was used that had a package-specific handler.
doesn't yet. Perhaps you should use a mixed-case attribute name, instead.
See L<attributes>.
-=item /%s/: Unrecognized escape \\%c passed through
+=item (in cleanup) %s
-(W) You used a backslash-character combination which is not recognized
-by Perl. This combination appears in an interpolated variable or a
-C<'>-delimited regular expression.
+(W) This prefix usually indicates that a DESTROY() method raised
+the indicated exception. Since destructors are usually called by
+the system at arbitrary points during execution, and often a vast
+number of times, the warning is issued only once for any number
+of failures that would otherwise result in the same message being
+repeated.
+
+Failure of user callbacks dispatched using the C<G_KEEPERR> flag
+could also result in this warning. See L<perlcall/G_KEEPERR>.
+
+=item <> should be quotes
+
+(F) You wrote C<require E<lt>fileE<gt>> when you should have written
+C<require 'file'>.
+
+=item Attempt to join self
+
+(F) You tried to join a thread from within itself, which is an
+impossible task. You may be joining the wrong thread, or you may
+need to move the join() to some other thread.
+
+=item Bad evalled substitution pattern
+
+(F) You've used the /e switch to evaluate the replacement for a
+substitution, but perl found a syntax error in the code to evaluate,
+most likely an unexpected right brace '}'.
+
+=item Bad realloc() ignored
+
+(S) An internal routine called realloc() on something that had never been
+malloc()ed in the first place. Mandatory, but can be disabled by
+setting environment variable C<PERL_BADFREE> to 1.
+
+=item Binary number > 0b11111111111111111111111111111111 non-portable
+
+(W) The binary number you specified is larger than 2**32-1
+(4294967295) and therefore non-portable between systems. See
+L<perlport> for more on portability concerns.
+
+=item Bit vector size > 32 non-portable
+
+(W) Using bit vector sizes larger than 32 is non-portable.
+
+=item Buffer overflow in prime_env_iter: %s
+
+(W) A warning peculiar to VMS. While Perl was preparing to iterate over
+%ENV, it encountered a logical name or symbol definition which was too long,
+so it was truncated to the string shown.
+
+=item Can't check filesystem of script "%s"
+
+(P) For some reason you can't check the filesystem of the script for nosuid.
+
+=item Can't modify non-lvalue subroutine call
+
+(F) Subroutines meant to be used in lvalue context should be declared as
+such, see L<perlsub/"Lvalue subroutines">.
+
+=item Can't read CRTL environ
+
+(S) A warning peculiar to VMS. Perl tried to read an element of %ENV
+from the CRTL's internal environment array and discovered the array was
+missing. You need to figure out where your CRTL misplaced its environ
+or define F<PERL_ENV_TABLES> (see L<perlvms>) so that environ is not searched.
+
+=item Can't remove %s: %s, skipping file
+
+(S) You requested an inplace edit without creating a backup file. Perl
+was unable to remove the original file to replace it with the modified
+file. The file was left unmodified.
+
+=item Can't return %s from lvalue subroutine
+
+(F) Perl detected an attempt to return illegal lvalues (such
+as temporary or readonly values) from a subroutine used as an lvalue.
+This is not allowed.
+
+=item Can't weaken a nonreference
+
+(F) You attempted to weaken something that was not a reference. Only
+references can be weakened.
+
+=item Character class [:%s:] unknown
+
+(F) The class in the character class [: :] syntax is unknown.
+See L<perlre>.
+
+=item Character class syntax [%s] belongs inside character classes
+
+(W) The character class constructs [: :], [= =], and [. .] go
+I<inside> character classes, the [] are part of the construct,
+for example: /[012[:alpha:]345]/. Note that [= =] and [. .]
+are not currently implemented; they are simply placeholders for
+future extensions.
+
+=item Constant is not %s reference
+
+(F) A constant value (perhaps declared using the C<use constant> pragma)
+is being dereferenced, but it amounts to the wrong type of reference. The
+message indicates the type of reference that was expected. This usually
+indicates a syntax error in dereferencing the constant value.
+See L<perlsub/"Constant Functions"> and L<constant>.
+
+=item constant(%s): %%^H is not localized
+
+(F) When setting compile-time-lexicalized hash %^H one should set the
+corresponding bit of $^H as well.
+
+=item constant(%s): %s
+
+(F) Compile-time-substitutions (such as overloaded constants and
+character names) were not correctly set up.
+
+=item defined(@array) is deprecated
+
+(D) defined() is not usually useful on arrays because it checks for an
+undefined I<scalar> value. If you want to see if the array is empty,
+just use C<if (@array) { # not empty }> for example.
+
+=item defined(%hash) is deprecated
+
+(D) defined() is not usually useful on hashes because it checks for an
+undefined I<scalar> value. If you want to see if the hash is empty,
+just use C<if (%hash) { # not empty }> for example.
+
+=item Did not produce a valid header
+
+See Server error.
+
+=item Document contains no data
+
+See Server error.
+
+=item entering effective %s failed
+
+(F) While under the C<use filetest> pragma, switching the real and
+effective uids or gids failed.
=item Filehandle %s opened only for output
(W) You tried to read from a filehandle opened only for writing. If you
-intended it to be a read-write filehandle, you needed to open it with
+intended it to be a read/write filehandle, you needed to open it with
"+E<lt>" or "+E<gt>" or "+E<gt>E<gt>" instead of with "E<lt>" or nothing. If
you intended only to read from the file, use "E<lt>". See
L<perlfunc/open>.
+=item Hexadecimal number > 0xffffffff non-portable
+
+(W) The hexadecimal number you specified is larger than 2**32-1
+(4294967295) and therefore non-portable between systems. See
+L<perlport> for more on portability concerns.
+
+=item Ill-formed CRTL environ value "%s"
+
+(W) A warning peculiar to VMS. Perl tried to read the CRTL's internal
+environ array, and encountered an element without the C<=> delimiter
+used to spearate keys from values. The element is ignored.
+
+=item Ill-formed message in prime_env_iter: |%s|
+
+(W) A warning peculiar to VMS. Perl tried to read a logical name
+or CLI symbol definition when preparing to iterate over %ENV, and
+didn't see the expected delimiter between key and value, so the
+line was ignored.
+
+=item Illegal binary digit %s
+
+(F) You used a digit other than 0 or 1 in a binary number.
+
+=item Illegal binary digit %s ignored
+
+(W) You may have tried to use a digit other than 0 or 1 in a binary number.
+Interpretation of the binary number stopped before the offending digit.
+
+=item Illegal number of bits in vec
+
+(F) The number of bits in vec() (the third argument) must be a power of
+two from 1 to 32 (or 64, if your platform supports that).
+
+=item Integer overflow in %s number
+
+(W) The hexadecimal, octal or binary number you have specified either
+as a literal or as an argument to hex() or oct() is too big for your
+architecture, and has been converted to a floating point number. On a
+32-bit architecture the largest hexadecimal, octal or binary number
+representable without overflow is 0xFFFFFFFF, 037777777777, or
+0b11111111111111111111111111111111 respectively. Note that Perl
+transparently promotes all numbers to a floating point representation
+internally--subject to loss of precision errors in subsequent
+operations.
+
=item Invalid %s attribute: %s
The indicated attribute for a subroutine or variable was not recognized
had a parenthesised parameter list, perhaps that list was terminated
too soon. See L<attributes>.
+=item Invalid separator character %s in subroutine attribute list
+
+(F) Something other than a comma or whitespace was seen between the
+elements of a subroutine attribute list. If the previous attribute
+had a parenthesised parameter list, perhaps that list was terminated
+too soon.
+
+=item leaving effective %s failed
+
+(F) While under the C<use filetest> pragma, switching the real and
+effective uids or gids failed.
+
+=item Lvalue subs returning %s not implemented yet
+
+(F) Due to limitations in the current implementation, array and hash
+values cannot be returned in subroutines used in lvalue context.
+See L<perlsub/"Lvalue subroutines">.
+
+=item Method %s not permitted
+
+See Server error.
+
+=item Missing %sbrace%s on \N{}
+
+(F) Wrong syntax of character name literal C<\N{charname}> within
+double-quotish context.
+
=item Missing command in piped open
(W) You used the C<open(FH, "| command")> or C<open(FH, "command |")>
(F) The reserved syntax for lexically scoped subroutines requires that they
have a name with which they can be found.
+=item no UTC offset information; assuming local time is UTC
+
+(S) A warning peculiar to VMS. Perl was unable to find the local
+timezone offset, so it's assuming that local system time is equivalent
+to UTC. If it's not, define the logical name F<SYS$TIMEZONE_DIFFERENTIAL>
+to translate to the number of seconds which need to be added to UTC to
+get local time.
+
+=item Octal number > 037777777777 non-portable
+
+(W) The octal number you specified is larger than 2**32-1 (4294967295)
+and therefore non-portable between systems. See L<perlport> for more
+on portability concerns.
+
+See also L<perlport> for writing portable code.
+
+=item panic: del_backref
+
+(P) Failed an internal consistency check while trying to reset a weak
+reference.
+
+=item panic: kid popen errno read
+
+(F) forked child returned an incomprehensible message about its errno.
+
+=item panic: magic_killbackrefs
+
+(P) Failed an internal consistency check while trying to reset all weak
+references to an object.
+
+=item Possible Y2K bug: %s
+
+(W) You are concatenating the number 19 with another number, which
+could be a potential Year 2000 problem.
+
+=item Premature end of script headers
+
+See Server error.
+
+=item realloc() of freed memory ignored
+
+(S) An internal routine called realloc() on something that had already
+been freed.
+
+=item Reference is already weak
+
+(W) You have attempted to weaken a reference that is already weak.
+Doing so has no effect.
+
+=item setpgrp can't take arguments
+
+(F) Your system has the setpgrp() from BSD 4.2, which takes no arguments,
+unlike POSIX setpgid(), which takes a process ID and process group ID.
+
+=item Strange *+?{} on zero-length expression
+
+(W) You applied a regular expression quantifier in a place where it
+makes no sense, such as on a zero-width assertion.
+Try putting the quantifier inside the assertion instead. For example,
+the way to match "abc" provided that it is followed by three
+repetitions of "xyz" is C</abc(?=(?:xyz){3})/>, not C</abc(?=xyz){3}/>.
+
+=item switching effective %s is not implemented
+
+(F) While under the C<use filetest> pragma, we cannot switch the
+real and effective uids or gids.
+
+=item This Perl can't reset CRTL environ elements (%s)
+
+=item This Perl can't set CRTL environ elements (%s=%s)
+
+(W) Warnings peculiar to VMS. You tried to change or delete an element
+of the CRTL's internal environ array, but your copy of Perl wasn't
+built with a CRTL that contained the setenv() function. You'll need to
+rebuild Perl with a CRTL that does, or redefine F<PERL_ENV_TABLES> (see
+L<perlvms>) so that the environ array isn't the target of the change to
+%ENV which produced the warning.
+
+=item Unknown open() mode '%s'
+
+(F) The second argument of 3-argument open() is not among the list
+of valid modes: C<L<lt>>, C<L<gt>>, C<E<gt>E<gt>>, C<+L<lt>>,
+C<+L<gt>>, C<+E<gt>E<gt>>, C<-|>, C<|->.
+
+=item Unknown process %x sent message to prime_env_iter: %s
+
+(P) An error peculiar to VMS. Perl was reading values for %ENV before
+iterating over it, and someone else stuck a message in the stream of
+data Perl expected. Someone's very confused, or perhaps trying to
+subvert Perl's population of %ENV for nefarious purposes.
+
=item Unrecognized escape \\%c passed through
(W) You used a backslash-character combination which is not recognized
block. Perhaps you terminated the parameter list of the previous attribute
too soon. See L<attributes>.
-=item defined(@array) is deprecated
-
-(D) defined() is not usually useful on arrays because it checks for an
-undefined I<scalar> value. If you want to see if the array is empty,
-just use C<if (@array) { # not empty }> for example.
-
-=item defined(%hash) is deprecated
-
-(D) defined() is not usually useful on hashes because it checks for an
-undefined I<scalar> value. If you want to see if the hash is empty,
-just use C<if (%hash) { # not empty }> for example.
-
-=item Invalid separator character %s in subroutine attribute list
-
-(F) Something other than a comma or whitespace was seen between the
-elements of a subroutine attribute list. If the previous attribute
-had a parenthesised parameter list, perhaps that list was terminated
-too soon.
-
-=item Possible Y2K bug: %s
-
-(W) You are concatenating the number 19 with another number, which
-could be a potential Year 2000 problem.
-
=item Unterminated attribute parameter in subroutine attribute list
(F) The lexer saw an opening (left) parenthesis character while parsing a
block. Perhaps you terminated the parameter list of the previous attribute
too soon.
-=item /%s/ should probably be written as "%s"
+=item Value of CLI symbol "%s" too long
-(W) You have used a pattern where Perl expected to find a string,
-like in the first argument to C<join>. Perl will treat the true
-or false result of matching the pattern against $_ as the string,
-which is probably not what you had in mind.
+(W) A warning peculiar to VMS. Perl tried to read the value of an %ENV
+element from a CLI symbol table, and found a resultant string longer
+than 1024 characters. The return value has been truncated to 1024
+characters.
-=item %s() called too early to check prototype
+=item Version number must be a constant number
-(W) You've called a function that has a prototype before the parser saw a
-definition or declaration for it, and Perl could not check that the call
-conforms to the prototype. You need to either add an early prototype
-declaration for the subroutine in question, or move the subroutine
-definition ahead of the call to get proper prototype checking. Alternatively,
-if you are certain that you're calling the function correctly, you may put
-an ampersand before the name to avoid the warning. See L<perlsub>.
+(P) The attempt to translate a C<use Module n.n LIST> statement into
+its equivalent C<BEGIN> block found an internal inconsistency with
+the version number.
+
+=back
=head1 Obsolete Diagnostics
-Todo.
+=over 4
+
+=item Character class syntax [: :] is reserved for future extensions
+
+(W) Within regular expression character classes ([]) the syntax beginning
+with "[:" and ending with ":]" is reserved for future extensions.
+If you need to represent those character sequences inside a regular
+expression character class, just quote the square brackets with the
+backslash: "\[:" and ":\]".
+
+=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. Because 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 nonstandard names,
+or it may indicate that a logical name table has been corrupted.
+
+=item regexp too big
+
+(F) The current implementation of regular expressions uses shorts as
+address offsets within a string. Unfortunately this means that if
+the regular expression compiles to longer than 32767, it'll blow up.
+Usually when you want a regular expression this big, there is a better
+way to do it with multiple statements. See L<perlre>.
+
+=item Use of "$$<digit>" to mean "${$}<digit>" is deprecated
+
+(D) Perl versions before 5.004 misinterpreted any type marker followed
+by "$" and a digit. For example, "$$0" was incorrectly taken to mean
+"${$}0" instead of "${$0}". This bug is (mostly) fixed in Perl 5.004.
+
+However, the developers of Perl 5.004 could not fix this bug completely,
+because at least two widely-used modules depend on the old meaning of
+"$$0" in a string. So Perl 5.004 still interprets "$$<digit>" in the
+old (broken) way inside strings; but it generates this message as a
+warning. And in Perl 5.005, this special treatment will cease.
+
+=back
=head1 BUGS
-If you find what you think is a bug, you might check the headers of
+If you find what you think is a bug, you might check the
articles recently posted to the comp.lang.perl.misc newsgroup.
There may also be information at http://www.perl.com/perl/, the Perl
Home Page.
projects / p5sagit/p5-mst-13.2.git / blobdiff