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✏️ Editing: perldeprecation.pod

=head1 NAME

perldeprecation - list Perl deprecations

=head1 DESCRIPTION

The purpose of this document is to document what has been deprecated
in Perl, and by which version the deprecated feature will disappear,
or, for already removed features, when it was removed.

This document will try to discuss what alternatives for the deprecated
features are available.

The deprecated features will be grouped by the version of Perl in
which they will be removed.

=head2 Perl 5.32

=head3 Constants from lexical variables potentially modified elsewhere

You wrote something like

my $var;
    $sub = sub () { $var };

but $var is referenced elsewhere and could be modified after the C<sub>
expression is evaluated.  Either it is explicitly modified elsewhere
(C<$var = 3>) or it is passed to a subroutine or to an operator like
C<printf> or C<map>, which may or may not modify the variable.

Traditionally, Perl has captured the value of the variable at that
point and turned the subroutine into a constant eligible for inlining.
In those cases where the variable can be modified elsewhere, this
breaks the behavior of closures, in which the subroutine captures
the variable itself, rather than its value, so future changes to the
variable are reflected in the subroutine's return value.

If you intended for the subroutine to be eligible for inlining, then
make sure the variable is not referenced elsewhere, possibly by
copying it:

my $var2 = $var;
    $sub = sub () { $var2 };

If you do want this subroutine to be a closure that reflects future
changes to the variable that it closes over, add an explicit C<return>:

my $var;
    $sub = sub () { return $var };

This usage has been deprecated, and will no longer be allowed in Perl 5.32.

=head2 Perl 5.30

=head3 C<< $* >> is no longer supported

Before Perl 5.10, setting C<< $* >> to a true value globally enabled
multi-line matching within a string. This relique from the past lost
its special meaning in 5.10. Use of this variable will be a fatal error
in Perl 5.30, freeing the variable up for a future special meaning.

To enable multiline matching one should use the C<< /m >> regexp
modifier (possibly in combination with C<< /s >>). This can be set
on a per match bases, or can be enabled per lexical scope (including
a whole file) with C<< use re '/m' >>.

=head3 C<< $# >> is no longer supported

This variable used to have a special meaning -- it could be used
to control how numbers were formatted when printed. This seldom
used functionality was removed in Perl 5.10. In order to free up
the variable for a future special meaning, its use will be a fatal
error in Perl 5.30.

To specify how numbers are formatted when printed, one is adviced
to use C<< printf >> or C<< sprintf >> instead.

=head3 C<< File::Glob::glob() >> will disappear

C<< File::Glob >> has a function called C<< glob >>, which just calls
C<< bsd_glob >>. However, its prototype is different from the prototype
of C<< CORE::glob >>, and hence, C<< File::Glob::glob >> should not
be used.

C<< File::Glob::glob() >> was deprecated in Perl 5.8. A deprecation
message was issued from Perl 5.26 onwards, and the function will
disappear in Perl 5.30.

Code using C<< File::Glob::glob() >> should call
C<< File::Glob::bsd_glob() >> instead.

=head3 Unescaped left braces in regular expressions

The simple rule to remember, if you want to match a literal C<{>
character (U+007B C<LEFT CURLY BRACKET>) in a regular expression
pattern, is to escape each literal instance of it in some way.
Generally easiest is to precede it with a backslash, like C<\{>
or enclose it in square brackets (C<[{]>).  If the pattern
delimiters are also braces, any matching right brace (C<}>) should
also be escaped to avoid confusing the parser, for example,

qr{abc\{def\}ghi}

Forcing literal C<{> characters to be escaped will enable the Perl
language to be extended in various ways in future releases.  To avoid
needlessly breaking existing code, the restriction is is not enforced in
contexts where there are unlikely to ever be extensions that could
conflict with the use there of C<{> as a literal.

Literal uses of C<{> were deprecated in Perl 5.20, and some uses of it
started to give deprecation warnings since. These cases were made fatal
in Perl 5.26. Due to an oversight, not all cases of a use of a literal
C<{> got a deprecation warning. These cases started warning in Perl 5.26,
and they will be fatal by Perl 5.30.

=head3 Unqualified C<dump()>

Use of C<dump()> instead of C<CORE::dump()> was deprecated in Perl 5.8,
and an unqualified C<dump()> will no longer be available in Perl 5.30.

See L<perlfunc/dump>.

=head3 Using my() in false conditional.

There has been a long-standing bug in Perl that causes a lexical variable
not to be cleared at scope exit when its declaration includes a false
conditional.  Some people have exploited this bug to achieve a kind of
static variable.  Since we intend to fix this bug, we don't want people
relying on this behavior.

Instead, it's recommended one uses C<state> variables to achieve the
same effect:

use 5.10.0;
    sub count {state $counter; return ++ $counter}
    say count ();    # Prints 1
    say count ();    # Prints 2

C<state> variables were introduced in Perl 5.10.

Alternatively, you can achieve a similar static effect by
declaring the variable in a separate block outside the function, eg

sub f { my $x if 0; return $x++ }

becomes

{ my $x; sub f { return $x++ } }

The use of C<my()> in a false conditional has been deprecated in
Perl 5.10, and it will become a fatal error in Perl 5.30.

=head3 Reading/writing bytes from/to :utf8 handles.

The sysread(), recv(), syswrite() and send() operators are
deprecated on handles that have the C<:utf8> layer, either explicitly, or
implicitly, eg., with the C<:encoding(UTF-16LE)> layer.

Both sysread() and recv() currently use only the C<:utf8> flag for the stream,
ignoring the actual layers.  Since sysread() and recv() do no UTF-8
validation they can end up creating invalidly encoded scalars.

Similarly, syswrite() and send() use only the C<:utf8> flag, otherwise ignoring
any layers.  If the flag is set, both write the value UTF-8 encoded, even if
the layer is some different encoding, such as the example above.

Ideally, all of these operators would completely ignore the C<:utf8> state,
working only with bytes, but this would result in silently breaking existing
code.  To avoid this a future version of perl will throw an exception when
any of sysread(), recv(), syswrite() or send() are called on handle with the
C<:utf8> layer.

In Perl 5.30, it will no longer be possible to use sysread(), recv(),
syswrite() or send() to read or send bytes from/to :utf8 handles.

=head3 Use of unassigned code point or non-standalone grapheme for a delimiter.

A grapheme is what appears to a native-speaker of a language to be a
character.  In Unicode (and hence Perl) a grapheme may actually be
several adjacent characters that together form a complete grapheme.  For
example, there can be a base character, like "R" and an accent, like a
circumflex "^", that appear when displayed to be a single character with
the circumflex hovering over the "R".  Perl currently allows things like
that circumflex to be delimiters of strings, patterns, I<etc>.  When
displayed, the circumflex would look like it belongs to the character
just to the left of it.  In order to move the language to be able to
accept graphemes as delimiters, we have to deprecate the use of
delimiters which aren't graphemes by themselves.  Also, a delimiter must
already be assigned (or known to be never going to be assigned) to try
to future-proof code, for otherwise code that works today would fail to
compile if the currently unassigned delimiter ends up being something
that isn't a stand-alone grapheme.  Because Unicode is never going to
assign
L<non-character code points|perlunicode/Noncharacter code points>, nor
L<code points that are above the legal Unicode maximum|
perlunicode/Beyond Unicode code points>, those can be delimiters, and
their use won't raise this warning.

In Perl 5.30, delimiters which are unassigned code points, or which
are non-standalone graphemes will be fatal.

=head3 In XS code, use of various macros dealing with UTF-8.

These macros will require an extra parameter in Perl 5.30:
C<isALPHANUMERIC_utf8>,
C<isASCII_utf8>,
C<isBLANK_utf8>,
C<isCNTRL_utf8>,
C<isDIGIT_utf8>,
C<isIDFIRST_utf8>,
C<isPSXSPC_utf8>,
C<isSPACE_utf8>,
C<isVERTWS_utf8>,
C<isWORDCHAR_utf8>,
C<isXDIGIT_utf8>,
C<isALPHANUMERIC_LC_utf8>,
C<isALPHA_LC_utf8>,
C<isASCII_LC_utf8>,
C<isBLANK_LC_utf8>,
C<isCNTRL_LC_utf8>,
C<isDIGIT_LC_utf8>,
C<isGRAPH_LC_utf8>,
C<isIDCONT_LC_utf8>,
C<isIDFIRST_LC_utf8>,
C<isLOWER_LC_utf8>,
C<isPRINT_LC_utf8>,
C<isPSXSPC_LC_utf8>,
C<isPUNCT_LC_utf8>,
C<isSPACE_LC_utf8>,
C<isUPPER_LC_utf8>,
C<isWORDCHAR_LC_utf8>,
C<isXDIGIT_LC_utf8>,
C<toFOLD_utf8>,
C<toLOWER_utf8>,
C<toTITLE_utf8>,
and
C<toUPPER_utf8>.

There is now a macro that corresponds to each one of these, simply by
appending C<_safe> to the name.  It takes the extra parameter.
For example, C<isDIGIT_utf8_safe> corresponds to C<isDIGIT_utf8>, but
takes the extra parameter, and its use doesn't generate a deprecation
warning.  All are documented in L<perlapi/Character case changing> and
L<perlapi/Character classification>.

You can change to use these versions at any time, or, if you can live
with the deprecation messages, wait until 5.30 and add the parameter to
the existing calls, without changing the names.

=head2 Perl 5.28

=head3 Attribute "%s" is deprecated, and will disappear in 5.28

The attributes C<< :locked >> (on code references) and C<< :unique >>
(on array, hash and scalar references) have had no effect since 
Perl 5.005 and Perl 5.8.8 respectively. Their use has been deprecated
since.

These attributes will no longer be recognized in Perl 5.28, and will
then result in a syntax error. Since the attributes do not do anything,
removing them from your code fixes the deprecation warning; and removing
them will not influence the behaviour of your code.

=head3 Bare here-document terminators

Perl has allowed you to use a bare here-document terminator to have the
here-document end at the first empty line. This practise was deprecated
in Perl 5.000, and this will be a fatal error in Perl 5.28.

You are encouraged to use the explictly quoted form if you wish to
use an empty line as the terminator of the here-document:

print <<"";
    Print this line.

# Previous blank line ends the here-document.

=head3 Setting $/ to a reference to a non-positive integer

You assigned a reference to a scalar to C<$/> where the
referenced item is not a positive integer.  In older perls this B<appeared>
to work the same as setting it to C<undef> but was in fact internally
different, less efficient and with very bad luck could have resulted in
your file being split by a stringified form of the reference.

In Perl 5.20.0 this was changed so that it would be B<exactly> the same as
setting C<$/> to undef, with the exception that this warning would be
thrown.

In Perl 5.28, this will throw a fatal error.

You are recommended to change your code to set C<$/> to C<undef> explicitly
if you wish to slurp the file.

=head3 Limit on the value of Unicode code points.

Unicode only allows code points up to 0x10FFFF, but Perl allows much
larger ones. However, using code points exceeding the maximum value
of an integer (C<IV_MAX>) may break the perl interpreter in some constructs,
including causing it to hang in a few cases.  The known problem areas
are in C<tr///>, regular expression pattern matching using quantifiers,
as quote delimiters in C<qI<X>...I<X>> (where I<X> is the C<chr()> of a large
code point), and as the upper limits in loops.

The use of out of range code points was deprecated in Perl 5.24, and
it will be a fatal error in Perl 5.28.

If your code is to run on various platforms, keep in mind that the upper
limit depends on the platform.  It is much larger on 64-bit word sizes
than 32-bit ones.

=head3 Use of comma-less variable list in formats.

It's allowed to use a list of variables in a format, without
separating them with commas. This usage has been deprecated
for a long time, and it will be a fatal error in Perl 5.28.

=head3 Use of C<\N{}>

Use of C<\N{}> with nothing between the braces was deprecated in
Perl 5.24, and will throw a fatal error in Perl 5.28.

Since such a construct is equivalent to using an empty string,
you are recommended to remove such C<\N{}> constructs.

=head3 Using the same symbol to open a filehandle and a dirhandle

It used to be legal to use C<open()> to associate both a
filehandle and a dirhandle to the same symbol (glob or scalar).
This idiom is likely to be confusing, and it was deprecated in
Perl 5.10.

Using the same symbol to C<open()> a filehandle and a dirhandle
will be a fatal error in Perl 5.28.

You should be using two different symbols instead.

=head3 ${^ENCODING} is no longer supported.

The special variable C<${^ENCODING}> was used to implement
the C<encoding> pragma. Setting this variable to anything other
than C<undef> was deprecated in Perl 5.22. Full deprecation
of the variable happened in Perl 5.25.3.

Setting this variable will become a fatal error in Perl 5.28.

=head3 C<< B::OP::terse >>

This method, which just calls C<< B::Concise::b_terse >>, has been
deprecated, and will disappear in Perl 5.28. Please use 
C<< B::Concise >> instead.

=head3 Use of inherited AUTOLOAD for non-method %s() is deprecated

As an (ahem) accidental feature, C<AUTOLOAD> subroutines are looked
up as methods (using the C<@ISA> hierarchy) even when the subroutines
to be autoloaded were called as plain functions (e.g. C<Foo::bar()>),
not as methods (e.g. C<< Foo->bar() >> or C<< $obj->bar() >>).

This bug will be rectified in future by using method lookup only for
methods' C<AUTOLOAD>s.

The simple rule is:  Inheritance will not work when autoloading
non-methods.  The simple fix for old code is:  In any module that used
to depend on inheriting C<AUTOLOAD> for non-methods from a base class
named C<BaseClass>, execute C<*AUTOLOAD = \&BaseClass::AUTOLOAD> during
startup.

In code that currently says C<use AutoLoader; @ISA = qw(AutoLoader);>
you should remove AutoLoader from @ISA and change C<use AutoLoader;> to
C<use AutoLoader 'AUTOLOAD';>.

This feature was deprecated in Perl 5.004, and will be fatal in Perl 5.28.

=head3 Use of code points over 0xFF in string bitwise operators

The string bitwise operators, C<&>, C<|>, C<^>, and C<~>, treat
their operands as strings of bytes. As such, values above 0xFF 
are nonsensical. Using such code points with these operators
was deprecated in Perl 5.24, and will be fatal in Perl 5.28.

=head3 In XS code, use of C<to_utf8_case()>

This function is being removed; instead convert to call
the appropriate one of:
L<C<toFOLD_utf8_safe>|perlapi/toFOLD_utf8_safe>.
L<C<toLOWER_utf8_safe>|perlapi/toLOWER_utf8_safe>,
L<C<toTITLE_utf8_safe>|perlapi/toTITLE_utf8_safe>,
or
L<C<toUPPER_utf8_safe>|perlapi/toUPPER_utf8_safe>.

=head2 Perl 5.26

=head3 C<< --libpods >> in C<< Pod::Html >>

Since Perl 5.18, the option C<< --libpods >> has been deprecated, and
using this option did not do anything other than producing a warning.

The C<< --libpods >> option is no longer recognized in Perl 5.26.

=head3 The utilities C<< c2ph >> and C<< pstruct >>

These old, perl3-era utilities have been deprecated in favour of
C<< h2xs >> for a long time. In Perl 5.26, they have been removed.

=head3 Trapping C<< $SIG {__DIE__} >> other than during program exit.

The C<$SIG{__DIE__}> hook is called even inside an C<eval()>. It was
never intended to happen this way, but an implementation glitch made
this possible. This used to be deprecated, as it allowed strange action
at a distance like rewriting a pending exception in C<$@>. Plans to
rectify this have been scrapped, as users found that rewriting a
pending exception is actually a useful feature, and not a bug.

Perl never issued a deprecation warning for this; the deprecation
was by documentation policy only. But this deprecation has been 
lifted in Perl 5.26.

=head3 Malformed UTF-8 string in "%s"

This message indicates a bug either in the Perl core or in XS
code. Such code was trying to find out if a character, allegedly
stored internally encoded as UTF-8, was of a given type, such as
being punctuation or a digit.  But the character was not encoded
in legal UTF-8.  The C<%s> is replaced by a string that can be used
by knowledgeable people to determine what the type being checked
against was.

Passing malformed strings was deprecated in Perl 5.18, and
became fatal in Perl 5.26.

=head2 Perl 5.24

=head3 Use of C<< *glob{FILEHANDLE} >>

The use of C<< *glob{FILEHANDLE} >> was deprecated in Perl 5.8.
The intention was to use C<< *glob{IO} >> instead, for which 
C<< *glob{FILEHANDLE} >> is an alias.

However, this feature was undeprecated in Perl 5.24.

=head3 Calling POSIX::%s() is deprecated

The following functions in the C<POSIX> module are no longer available:
C<isalnum>, C<isalpha>, C<iscntrl>, C<isdigit>, C<isgraph>, C<islower>,  
C<isprint>, C<ispunct>, C<isspace>, C<isupper>, and C<isxdigit>.  The 
functions are buggy and don't work on UTF-8 encoded strings.  See their
entries in L<POSIX> for more information.

The functions were deprecated in Perl 5.20, and removed in Perl 5.24.

=head2 Perl 5.16

=head3 Use of %s on a handle without * is deprecated

It used to be possible to use C<tie>, C<tied> or C<untie> on a scalar
while the scalar holds a typeglob. This caused its filehandle to be
tied. It left no way to tie the scalar itself when it held a typeglob,
and no way to untie a scalar that had had a typeglob assigned to it.

This was deprecated in Perl 5.14, and the bug was fixed in Perl 5.16.

So now C<tie $scalar> will always tie the scalar, not the handle it holds.
To tie the handle, use C<tie *$scalar> (with an explicit asterisk).  The same
applies to C<tied *$scalar> and C<untie *$scalar>.

=head1 SEE ALSO

L<warnings>, L<diagnostics>.

=cut

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