=over 4
+=item A thread exited while %d other threads were still running
+
+(W) When using threaded Perl, a thread (not necessarily the main
+thread) exited while there were still other threads running.
+Usually it's a good idea to first collect the return values of the
+created threads by joining them, and only then exit from the main
+thread. See L<threads>.
+
=item accept() on closed socket %s
(W closed) You tried to do an accept on a closed socket. Did you forget
imported with the C<use subs> pragma).
To silently interpret it as the Perl operator, use the C<CORE::> prefix
-on the operator (e.g. C<CORE::log($x)>) or by declaring the subroutine
+on the operator (e.g. C<CORE::log($x)>) or declare the subroutine
to be an object method (see L<perlsub/"Subroutine Attributes"> or
L<attributes>).
=item Applying %s to %s will act on scalar(%s)
-(W misc) The pattern match (//), substitution (s///), and
-transliteration (tr///) operators work on scalar values. If you apply
+(W misc) The pattern match (C<//>), substitution (C<s///>), and
+transliteration (C<tr///>) operators work on scalar values. If you apply
one of them to an array or a hash, it will convert the array or hash to
a scalar value -- the length of an array, or the population info of a
hash -- and then work on that scalar value. This is probably not what
must either both be scalars or both be lists. Otherwise Perl won't
know which context to supply to the right side.
-=item Negative offset to vec in lvalue context
+=item Attempt to access disallowed key '%s' in a restricted hash
-(F) When vec is called in an lvalue context, the second argument must be
-greater than or equal to zero.
+(F) The failing code has attempted to get or set a key which is not in
+the current set of allowed keys of a restricted hash.
+
+=item Attempt to clear a restricted hash
+
+(F) It is currently not allowed to clear a restricted hash, even if the
+new hash would contain the same keys as before. This may change in
+the future.
+
+=item Attempt to delete readonly key '%s' from a restricted hash
+
+(F) The failing code attempted to delete a key whose value has been
+declared readonly from a restricted hash.
+
+=item Attempt to delete disallowed key '%s' from a restricted hash
+
+(F) The failing code attempted to delete from a restricted hash a key
+which is not in its key set.
=item Attempt to bless into a reference
used as an lvalue, which is pretty strange. Perhaps you forgot to
dereference it first. See L<perlfunc/substr>.
-=item Bad arg length for %s, is %d, should be %d
+=item Bad arg length for %s, is %d, should be %s
(F) You passed a buffer of the wrong size to one of msgctl(), semctl()
or shmctl(). In C parlance, the correct sizes are, respectively,
=item Bad evalled substitution pattern
-(F) You've used the /e switch to evaluate the replacement for a
+(F) You've used the C</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 Can't declare class for non-scalar %s in "%s"
-(S) Currently, only scalar variables can declared with a specific class
-qualifier in a "my" or "our" declaration. The semantics may be extended
-for other types of variables in future.
+(F) Currently, only scalar variables can be declared with a specific
+class qualifier in a "my" or "our" declaration. The semantics may be
+extended for other types of variables in future.
=item Can't declare %s in "%s"
=item Can't exec "%s": %s
-(W exec) An system(), exec(), or piped open call could not execute the
+(W exec) A system(), exec(), or piped open call could not execute the
named program for the indicated reason. Typical reasons include: the
permissions were wrong on the file, the file wasn't found in
C<$ENV{PATH}>, the executable in question was compiled for another
=item Can't find %s character property "%s"
(F) You used C<\p{}> or C<\P{}> but the character property by that name
-could not be find. Maybe you mispelled the name of the property
+could not be found. Maybe you misspelled the name of the property
(remember that the names of character properties consist only of
alphanumeric characters), or maybe you forgot the C<Is> or C<In> prefix?
=item Can't find %s property definition %s
-(F) You may have tried to use C<\p> which means a Unicode property for
-example \p{Lu} is all uppercase letters. Escape the C<\p>, either
-C<\\p> (just the C<\p>) or by C<\Q\p> (the rest of the string, until
+(F) You may have tried to use C<\p> which means a Unicode property (for
+example C<\p{Lu}> is all uppercase letters). If you did mean to use a
+Unicode property, see L<perlunicode> for the list of known properties.
+If you didn't mean to use a Unicode property, escape the C<\p>, either
+by C<\\p> (just the C<\p>) or by C<\Q\p> (the rest of the string, until
possible C<\E>).
=item Can't fork
functioning as a class, but that package doesn't define that particular
method, nor does any of its base classes. See L<perlobj>.
+=item Can't locate PerlIO%s
+
+(F) You tried to use in open() a PerlIO layer that does not exist,
+e.g. open(FH, ">:nosuchlayer", "somefile").
+
=item (perhaps you forgot to load "%s"?)
(F) This is an educated guess made in conjunction with the message
is because you don't have read permission for a file which you named on
the command line.
+=item Can't open a reference
+
+(W io) You tried to open a scalar reference for reading or writing,
+using the 3-arg open() syntax :
+
+ open FH, '>', $ref;
+
+but your version of perl is compiled without perlio, and this form of
+open is not supported.
+
=item Can't open bidirectional pipe
(W pipe) You tried to say C<open(CMD, "|cmd|")>, which is not supported.
If you actually want to pack Unicode codepoints, use the C<"U"> format
instead.
-=item chmod() mode argument is missing initial 0
-
-(W chmod) A novice will sometimes say
-
- chmod 777, $filename
-
-not realizing that 777 will be interpreted as a decimal number,
-equivalent to 01411. Octal constants are introduced with a leading 0 in
-Perl, as in C.
-
=item close() on unopened filehandle %s
(W unopened) You tried to close a filehandle that was never opened.
that it is simpler or backtracks less. (See L<perlfaq2> for information
on I<Mastering Regular Expressions>.)
+=item cond_broadcast() called on unlocked variable
+
+(W threads) Within a thread-enabled program, you tried to call
+cond_broadcast() on a variable which wasn't locked. The cond_broadcast()
+function is used to wake up another thread that is waiting in a
+cond_wait(). To ensure that the signal isn't sent before the other thread
+has a chance to enter the wait, it is usual for the signaling thread to
+first wait for a lock on variable. This lock attempt will only succeed
+after the other thread has entered cond_wait() and thus relinquished the
+lock.
+
+
+=item cond_signal() called on unlocked variable
+
+(W threads) Within a thread-enabled program, you tried to call
+cond_signal() on a variable which wasn't locked. The cond_signal()
+function is used to wake up another thread that is waiting in a
+cond_wait(). To ensure that the signal isn't sent before the other thread
+has a chance to enter the wait, it is usual for the signaling thread to
+first wait for a lock on variable. This lock attempt will only succeed
+after the other thread has entered cond_wait() and thus relinquished the
+lock.
+
=item connect() on closed socket %s
(W closed) You tried to do a connect on a closed socket. Did you forget
=item Constant subroutine %s redefined
-(S|W redefine) You redefined a subroutine which had previously been
+(S) You redefined a subroutine which had previously been
eligible for inlining. See L<perlsub/"Constant Functions"> for
commentary and workarounds.
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 %s defines neither package nor VERSION--version check failed
+
+(F) You said something like "use Module 42" but in the Module file
+there are neither package declarations nor a C<$VERSION>.
+
=item Delimiter for here document is too long
(F) In a here document construct like C<<<FOO>, the label C<FOO> is too
See Server error.
+=item %s does not define %s::VERSION--version check failed
+
+(F) You said something like "use Module 42" but the Module did not
+define a C<$VERSION.>
+
=item Don't know how to handle magic of type '%s'
(P) The internal handling of magical variables has been cursed.
subroutine or package before the current location. You can use an empty
"sub foo;" or "package FOO;" to enter a "forward" declaration.
+=item dump() better written as CORE::dump()
+
+(W misc) You used the obsolescent C<dump()> built-in function, without fully
+qualifying it as C<CORE::dump()>. Maybe it's a typo. See L<perlfunc/dump>.
+
=item Duplicate free() ignored
(S malloc) An internal routine called free() on something that had
"elseif" for the class returned by the following block. This is
unlikely to be what you want.
+=item Empty %s
+
+(F) C<\p> and C<\P> are used to introduce a named Unicode property, as
+described in L<perlunicode> and L<perlre>. You used C<\p> or C<\P> in
+a regular expression without specifying the property name.
+
=item entering effective %s failed
(F) While under the C<use filetest> pragma, switching the real and
filenames, try using the glob() operator, or put the filenames into a
variable and glob that.
+=item exec? I'm not *that* kind of operating system
+
+(F) The C<exec> function is not implemented in MacPerl. See L<perlport>.
+
=item Execution of %s aborted due to compilation errors
(F) The final summary message when a Perl compilation fails.
=item Exiting format via %s
-(W exiting) You are exiting an eval by unconventional means, such as a
+(W exiting) You are exiting a format by unconventional means, such as a
goto, or a loop control statement.
=item Exiting pseudo-block via %s
to be a read-write filehandle, you needed to open it with "+<" or "+>"
or "+>>" instead of with "<" or nothing. If you intended only to write
the file, use ">" or ">>". See L<perlfunc/open>.
+The warning will also occur if STDOUT (file descriptor 1) or STDERR
+(file descriptor 2) is opened for input, this is a pre-emptive warning in
+case some other part of your program or a child process is expecting STDOUT
+and STDERR to be writable. This can happen accidentally if you
+C<close(STDOUT)> or STDERR and then C<open> an unrelated handle which
+will resuse the lowest numbered available descriptor.
=item Filehandle %s opened only for output
-(W io) 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
+(W io) 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 "+<" or "+>" or "+>>" instead of with "<" or nothing. If you
intended only to read from the file, use "<". See L<perlfunc/open>.
+The warning will also occur if STDIN (file descriptor 0) is opened
+for output - this is a pre-emptive warning in case some other part of your
+program or a child process is expecting STDIN to be readable.
+This can happen accidentally if you C<close(STDIN)> and then C<open> an
+unrelated handle which will resuse the lowest numbered available
+descriptor.
=item Final $ should be \$ or $name
filehandles. Are you attempting to call flock() on a dirhandle by the
same name?
-=item Quantifier follows nothing in regex; marked by <-- HERE in m/%s/
+=item Quantifier follows nothing in regex;
+
+marked by <-- HERE in m/%s/
(F) You started a regular expression with a quantifier. Backslash it if you
meant it literally. The <-- HERE shows in the regular expression about
(W redefine) You redefined a format. To suppress this warning, say
{
- no warnings;
+ no warnings 'redefine';
eval "format NAME =...";
}
(F) Unlike with "next" or "last", you're not allowed to goto an
unspecified destination. See L<perlfunc/goto>.
+=item %s-group starts with a count
+
+(F) In pack/unpack a ()-group started with a count. A count is
+supposed to follow something: a template character or a ()-group.
+
=item %s had compilation errors
(F) The final summary message when a C<perl -c> fails.
version of Perl appears to have been built without this support. Talk
to your Perl administrator.
+=item Illegal character in prototype for %s : %s
+
+(W syntax) An illegal character was found in a prototype declaration. Legal
+characters in prototypes are $, @, %, *, ;, [, ], &, and \.
+
=item Illegal division by zero
(F) You tried to divide a number by 0. Either something was wrong in
=item Illegal octal digit %s
-(F) You used an 8 or 9 in a octal number.
+(F) You used an 8 or 9 in an octal number.
=item Illegal octal digit %s ignored
-(W digit) You may have tried to use an 8 or 9 in a octal number.
+(W digit) You may have tried to use an 8 or 9 in an octal number.
Interpretation of the octal number stopped before the 8 or 9.
=item Illegal switch in PERL5OPT: %s
(X) The PERL5OPT environment variable may only be used to set the
-following switches: B<-[DIMUdmw]>.
+following switches: B<-[DIMUdmtw]>.
=item Ill-formed CRTL environ value "%s"
Failure of user callbacks dispatched using the C<G_KEEPERR> flag could
also result in this warning. See L<perlcall/G_KEEPERR>.
+=item In EBCDIC the v-string components cannot exceed 2147483647
+
+(F) An error peculiar to EBCDIC. Internally, v-strings are stored as
+Unicode code points, and encoded in EBCDIC as UTF-EBCDIC. The UTF-EBCDIC
+encoding is limited to code points no larger than 2147483647 (0x7FFFFFFF).
+
=item Insecure dependency in %s
(F) You tried to do something that the tainting mechanism didn't like.
The <-- HERE shows in the regular expression about where the problem was
discovered.
-
=item Internal inconsistency in tracking vforks
(S) A warning peculiar to VMS. Perl keeps track of the number of times
<-- HERE shows in the regular expression about where the problem was
discovered.
-
=item %s (...) interpreted as function
(W syntax) You've run afoul of the rule that says that any list operator
=item `%s' is not a code reference
-(W) The second (fourth, sixth, ...) argument of overload::constant needs
-to be a code reference. Either an anonymous subroutine, or a reference
+(W overload) The second (fourth, sixth, ...) argument of overload::constant
+needs to be a code reference. Either an anonymous subroutine, or a reference
to a subroutine.
=item `%s' is not an overloadable type
-(W) You tried to overload a constant type the overload package is unaware of.
+(W overload) You tried to overload a constant type the overload package is
+unaware of.
=item junk on end of regexp
=item lstat() on filehandle %s
-(W io) You tried to do a lstat on a filehandle. What did you mean
+(W io) You tried to do an lstat on a filehandle. What did you mean
by that? lstat() makes sense only on filenames. (Perl did a fstat()
instead on the filehandle.)
values cannot be returned in subroutines used in lvalue context. See
L<perlsub/"Lvalue subroutines">.
-=item Lookbehind longer than %d not implemented in regex; marked by <-- HERE in m/%s/
+=item Lookbehind longer than %d not implemented in regex;
+
+marked by <-- HERE in m/%s/
(F) There is currently a limit on the length of string which lookbehind can
handle. This restriction may be eased in a future release. The <-- HERE
prefix1;prefix2
or
-
prefix1 prefix2
with nonempty prefix1 and prefix2. If C<prefix1> is indeed a prefix of
appear if components are not found, or are too long. See
"PERLLIB_PREFIX" in L<perlos2>.
+=item Malformed prototype for %s: %s
+
+(F) You tried to use a function with a malformed prototype. The
+syntax of function prototypes is given a brief compile-time check for
+obvious errors like invalid characters. A more rigorous check is run
+when the function is called.
+
=item Malformed UTF-8 character (%s)
Perl detected something that didn't comply with UTF-8 encoding rules.
+One possible cause is that you read in data that you thought to be in
+UTF-8 but it wasn't (it was for example legacy 8-bit data). Another
+possibility is careless use of utf8::upgrade().
+
=item Malformed UTF-16 surrogate
Perl thought it was reading UTF-16 encoded character data but while
doing it Perl met a malformed Unicode surrogate.
-=item %s matches null string many times in regex; marked by <-- HERE in m/%s/
+=item %s matches null string many times in regex;
+
+marked by <-- HERE in m/%s/
(W regexp) The pattern you've specified would be an infinite loop if the
regular expression engine didn't specifically check for that. The <-- HERE
shows in the regular expression about where the problem was discovered.
See L<perlre>.
+=item "%s" may clash with future reserved word
+
+(W) This warning may be due to running a perl5 script through a perl4
+interpreter, especially if the word that is being warned about is
+"use" or "my".
+
=item % may only be used in unpack
(F) You can't pack a string by supplying a checksum, because the
(S) This is an educated guess made in conjunction with the message "%s
found where operator expected". Often the missing operator is a comma.
+=item Missing right brace on %s
+
+(F) Missing right brace in C<\p{...}> or C<\P{...}>.
+
=item Missing right curly or square bracket
(F) The lexer counted more opening curly or square brackets than closing
you omitted the name of the module. Consult L<perlrun> for full details
about C<-M> and C<-m>.
+=item More than one argument to open
+
+(F) The C<open> function has been asked to open multiple files. This
+can happen if you are trying to open a pipe to a command that takes a
+list of arguments, but have forgotten to specify a piped open mode.
+See L<perlfunc/open> for details.
+
=item msg%s not implemented
(F) You don't have System V message IPC on your system.
(F) You tried to do a read/write/send/recv operation with a buffer
length that is less than 0. This is difficult to imagine.
+=item Negative offset to vec in lvalue context
+
+(F) When C<vec> is called in an lvalue context, the second argument must be
+greater than or equal to zero.
+
=item Nested quantifiers in regex; marked by <-- HERE in m/%s/
(F) You can't quantify a quantifier without intervening parentheses. So
(F) The indicated command line switch needs a mandatory argument, but
you haven't specified one.
+=item No such class %s
+
+(F) You provided a class qualifier in a "my" or "our" declaration, but
+this class doesn't exist at this point in your program.
+
=item No such pipe open
(P) An error peculiar to VMS. The internal routine my_pclose() tried to
of Perl. Check the #! line, or manually feed your script into Perl
yourself.
+=item %s not allowed in length fields
+
+(F) The count in the (un)pack template may be replaced by C<[TEMPLATE]> only if
+C<TEMPLATE> always matches the same amount of packed bytes. Redesign
+the template.
+
=item no UTC offset information; assuming local time is UTC
(S) A warning peculiar to VMS. Perl was unable to find the local
=item Number too long
(F) Perl limits the representation of decimal numbers in programs to
-about about 250 characters. You've exceeded that length. Future
+about 250 characters. You've exceeded that length. Future
versions of Perl are likely to eliminate this arbitrary limitation. In
the meantime, try using scientific notation (e.g. "1e6" instead of
"1_000_000").
=item Odd number of arguments for overload::constant
-(W) The call to overload::constant contained an odd number of arguments.
-The arguments should come in pairs.
+(W overload) The call to overload::constant contained an odd number of
+arguments. The arguments should come in pairs.
+
+=item Odd number of elements in anonymous hash
+
+(W misc) You specified an odd number of elements to initialize a hash,
+which is odd, because hashes come in key/value pairs.
=item Odd number of elements in hash assignment
(P) We popped the context stack to an eval context, and then discovered
it wasn't an eval context.
-=item panic: pp_match
+=item panic: pp_match%s
(P) The internal pp_match() routine was called with invalid operational
data.
=item perlio: argument list not closed for layer "%s"
-(S) When pushing a layer with arguments onto the Perl I/O system you forgot
-the ) that closes the argument list. (Layers take care of transforming
+(W layer) When pushing a layer with arguments onto the Perl I/O system you
+forgot the ) that closes the argument list. (Layers take care of transforming
data between external and internal representations.) Perl stopped parsing
the layer list at this point and did not attempt to push this layer.
If your program didn't explicitly request the failing operation, it may be
the result of the value of the environment variable PERLIO.
-=item perlio: invalid separator character %s in attribute list
+=item perlio: invalid separator character %s in layer specification list %s
-(S) When pushing layers onto the Perl I/O system, something other than a
-colon or whitespace was seen between the elements of an layer list.
+(W layer) When pushing layers onto the Perl I/O system, something other than a
+colon or whitespace was seen between the elements of a layer list.
If the previous attribute had a parenthesised parameter list, perhaps that
list was terminated too soon.
=item perlio: unknown layer "%s"
-(S) An attempt was made to push an unknown layer onto the Perl I/O
+(W layer) An attempt was made to push an unknown layer onto the Perl I/O
system. (Layers take care of transforming data between external and
internal representations.) Note that some layers, such as C<mmap>,
are not supported in all environments. If your program didn't
process which isn't a subprocess of the current process. While this is
fine from VMS' perspective, it's probably not what you intended.
-=item POSIX syntax [%s] belongs inside character classes in regex; marked by <-- HERE in m/%s/
+=item P must have an explicit size
+
+(F) The unpack format P must have an explicit size, not "*".
+
+=item POSIX syntax [%s] belongs inside character classes in regex;
-(W unsafe) The character class constructs [: :], [= =], and [. .] go
+marked by <-- HERE in m/%s/
+
+(W regexp) 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 and will
cause fatal errors. The <-- HERE shows in the regular expression about
where the problem was discovered. See L<perlre>.
-=item POSIX syntax [. .] is reserved for future extensions in regex; marked by <-- HERE in m/%s/
+=item POSIX syntax [. .] is reserved for future extensions in regex;
+
+marked by <-- HERE in m/%s/
(F regexp) Within regular expression character classes ([]) the syntax
beginning with "[." and ending with ".]" is reserved for future extensions.
backslash: "\[." and ".\]". The <-- HERE shows in the regular expression
about where the problem was discovered. See L<perlre>.
-=item POSIX syntax [= =] is reserved for future extensions in regex; marked by <-- HERE in m/%s/
+=item POSIX syntax [= =] is reserved for future extensions in regex;
+
+marked by <-- HERE in m/%s/
(F) Within regular expression character classes ([]) the syntax beginning
with "[=" and ending with "=]" is reserved for future extensions. If you
and "=\]". The <-- HERE shows in the regular expression about where the
problem was discovered. See L<perlre>.
-=item POSIX class [:%s:] unknown in regex; marked by <-- HERE in m/%s/
+=item POSIX class [:%s:] unknown in regex;
+
+marked by <-- HERE in m/%s/
(F) The class in the character class [: :] syntax is unknown. The <-- HERE
shows in the regular expression about where the problem was discovered.
-See L<perlre>.
+Note that the POSIX character classes do B<not> have the C<is> prefix
+the corresponding C interfaces have: in other words, it's C<[[:print:]]>,
+not C<isprint>. See L<perlre>.
=item POSIX getpgrp can't take an argument
end of the buffer just in case. This sentinel byte got clobbered, and
Perl assumes that memory is now corrupted. See L<perlfunc/ioctl>.
+=item Possible unintended interpolation of %s in string
+
+(W ambiguous) You said something like `@foo' in a double-quoted string
+but there was no array C<@foo> in scope at the time. If you wanted a
+literal @foo, then write it as \@foo; otherwise find out what happened
+to the array you apparently lost track of.
+
=item Possible Y2K bug: %s
(W y2k) You are concatenating the number 19 with another number, which
=item Prototype mismatch: %s vs %s
-(S unsafe) The subroutine being declared or defined had previously been
+(S prototype) The subroutine being declared or defined had previously been
declared or defined with a different function prototype.
-=item Quantifier in {,} bigger than %d in regex; marked by <-- HERE in m/%s/
+=item Prototype not terminated
+
+(F) You've omitted the closing parenthesis in a function prototype
+definition.
+
+=item Quantifier in {,} bigger than %d in regex;
+
+marked by <-- HERE in m/%s/
(F) There is currently a limit to the size of the min and max values of the
{min,max} construct. The <-- HERE shows in the regular expression about where
the problem was discovered. See L<perlre>.
-=item Quantifier unexpected on zero-length expression; marked by <-- HERE in m/%s/
+=item Quantifier unexpected on zero-length expression;
+
+marked by <-- HERE in m/%s/
(W regexp) You applied a regular expression quantifier in a place where
it makes no sense, such as on a zero-width assertion. Try putting the
(W internal) The internal sv_replace() function was handed a new SV with
a reference count of other than 1.
-=item Reference to nonexistent group in regex; marked by <-- HERE in m/%s/
+=item Reference to nonexistent group in regex;
+
+marked by <-- HERE in m/%s/
(F) You used something like C<\7> in your regular expression, but there are
not at least seven sets of capturing parentheses in the expression. If you
shows in the regular expression about where the problem was discovered. See
L<perlre>.
-=item Sequence (?{...}) not terminated or not {}-balanced in regex; marked by <-- HERE in m/%s/
+=item Sequence (?{...}) not terminated or not {}-balanced in regex;
+
+marked by <-- HERE in m/%s/
(F) If the contents of a (?{...}) clause contains braces, they must balance
for Perl to properly detect the end of the clause. The <-- HERE shows in
the regular expression about where the problem was discovered. See
L<perlre>.
-=item Sequence (?%s...) not implemented in regex; marked by <-- HERE in m/%s/
+=item Sequence (?%s...) not implemented in regex;
+
+marked by <-- HERE in m/%s/
(F) A proposed regular expression extension has the character reserved but
has not yet been written. The <-- HERE shows in the regular expression about
where the problem was discovered. See L<perlre>.
-=item Sequence (?%s...) not recognized in regex; marked by <-- HERE in m/%s/
+=item Sequence (?%s...) not recognized in regex;
+
+marked by <-- HERE in m/%s/
(F) You used a regular expression extension that doesn't make sense. The
<-- HERE shows in the regular expression about where the problem was
discovered. See L<perlre>.
-=item Sequence (?#... not terminated in regex; marked by <-- HERE in m/%s/
+=item Sequence (?#... not terminated in regex;
+
+marked by <-- HERE in m/%s/
(F) A regular expression comment must be terminated by a closing
parenthesis. Embedded parentheses aren't allowed. The <-- HERE shows in
location where the CGI server can't find it, basically, more or less.
Please see the following for more information:
- http://www.perl.com/CPAN/doc/FAQs/cgi/idiots-guide.html
- http://www.perl.com/CPAN/doc/FAQs/cgi/perl-cgi-faq.html
- ftp://rtfm.mit.edu/pub/usenet/news.answers/www/cgi-faq
- http://hoohoo.ncsa.uiuc.edu/cgi/interface.html
- http://www-genome.wi.mit.edu/WWW/faqs/www-security-faq.html
+ http://www.perl.org/CGI_MetaFAQ.html
+ http://www.htmlhelp.org/faq/cgifaq.html
+ http://www.w3.org/Security/Faq/
You should also look at L<perlfaq9>.
(F) A sort comparison subroutine may not return a list value with more
or less than one element. See L<perlfunc/sort>.
+=item splice() offset past end of array
+
+(W misc) You attempted to specify an offset that was past the end of
+the array passed to splice(). Splicing will instead commence at the end
+of the array, rather than past it. If this isn't what you want, try
+explicitly pre-extending the array by assigning $#array = $offset. See
+L<perlfunc/splice>.
+
=item Split loop
(P) The split was looping infinitely. (Obviously, a split shouldn't
(W redefine) You redefined a subroutine. To suppress this warning, say
{
- no warnings;
+ no warnings 'redefine';
eval "sub name { ... }";
}
=item Substitution pattern not terminated
-(F) The lexer couldn't find the interior delimiter of a s/// or s{}{}
+(F) The lexer couldn't find the interior delimiter of an s/// or s{}{}
construct. Remember that bracketing delimiters count nesting level.
Missing the leading C<$> from variable C<$s> may cause this error.
=item Substitution replacement not terminated
-(F) The lexer couldn't find the final delimiter of a s/// or s{}{}
+(F) The lexer couldn't find the final delimiter of an s/// or s{}{}
construct. Remember that bracketing delimiters count nesting level.
Missing the leading C<$> from variable C<$s> may cause this error.
(F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but
a version of the setuid emulator somehow got run anyway.
-=item Switch (?(condition)... contains too many branches in regex; marked by <-- HERE in m/%s/
+=item Switch (?(condition)... contains too many branches in regex;
+
+marked by <-- HERE in m/%s/
(F) A (?(condition)if-clause|else-clause) construct can have at most two
branches (the if-clause and the else-clause). If you want one or both to
The <-- HERE shows in the regular expression about where the problem was
discovered. See L<perlre>.
-=item Switch condition not recognized in regex; marked by <-- HERE in m/%s/
+=item Switch condition not recognized in regex;
+
+marked by <-- HERE in m/%s/
(F) If the argument to the (?(...)if-clause|else-clause) construct is a
number, it can be only a number. The <-- HERE shows in the regular expression
of Perl. Check the #! line, or manually feed your script into Perl
yourself.
+=item syntax error in file %s at line %d, next 2 tokens "%s"
+
+(F) This error is likely to occur if you run a perl5 script through
+a perl4 interpreter, especially if the next 2 tokens are "use strict"
+or "my $var" or "our $var".
+
=item %s syntax OK
(F) The final summary message when a C<perl -c> succeeds.
target of the change to
%ENV which produced the warning.
+=item thread failed to start: %s
+
+(F) The entry point function of threads->create() failed for some reason.
+
=item times not implemented
(F) Your version of the C library apparently doesn't do times(). I
=item Too many )'s
+=item Too many ('s
+
(A) You've accidentally run your script through B<csh> instead of Perl.
Check the #! line, or manually feed your script into Perl yourself.
-=item Too many ('s
-
=item Trailing \ in regex m/%s/
(F) The regular expression ends with an unbackslashed backslash.
%NAME or C<%{EXPR}>. No implicit dereferencing is allowed--use the
{EXPR} forms as an explicit dereference. See L<perlref>.
-=item umask: argument is missing initial 0
-
-(W umask) A umask of 222 is incorrect. It should be 0222, because octal
-literals always start with 0 in Perl, as in C.
-
=item umask not implemented
(F) Your machine doesn't implement the umask function and you tried to
(F) The unexec() routine failed for some reason. See your local FSF
representative, who probably put it there in the first place.
+=item Unicode character %s is illegal
+
+(W utf8) Certain Unicode characters have been designated off-limits by
+the Unicode standard and should not be generated. If you really know
+what you are doing you can turn off this warning by C<no warnings 'utf8';>.
=item Unknown BYTEORDER
(F) There are no byte-swapping functions for a machine with this byte
order.
-=item Unknown switch condition (?(%.2s in regex; marked by <-- HERE in m/%s/
+=item Unknown "re" subpragma '%s' (known ones are: %s)
+
+You tried to use an unknown subpragma of the "re" pragma.
+
+=item Unknown switch condition (?(%.2s in regex;
+
+marked by <-- HERE in m/%s/
(F) The condition part of a (?(condition)if-clause|else-clause) construct
is not known. The condition may be lookahead or lookbehind (the condition
(F) The second argument of 3-argument open() is not among the list
of valid modes: C<< < >>, C<< > >>, C<<< >> >>>, C<< +< >>,
-C<< +> >>, C<<< +>> >>>, C<-|>, C<|->.
+C<< +> >>, C<<< +>> >>>, C<-|>, C<|->, C<< <& >>, C<< >& >>.
=item Unknown process %x sent message to prime_env_iter: %s
data Perl expected. Someone's very confused, or perhaps trying to
subvert Perl's population of %ENV for nefarious purposes.
+=item Unknown warnings category '%s'
+
+(F) An error issued by the C<warnings> pragma. You specified a warnings
+category that is unknown to perl at this point.
+
+Note that if you want to enable a warnings category registered by a module
+(e.g. C<use warnings 'File::Find'>), you must have imported this module
+first.
+
=item unmatched [ in regex; marked by <-- HERE in m/%s/
(F) The brackets around a character class must match. If you wish to
recognized by Perl inside character classes. The character was
understood literally.
-=item Unrecognized escape \\%c passed through in regex; marked by <-- HERE in m/%s/
+=item Unrecognized escape \\%c passed through in regex;
+
+marked by <-- HERE in m/%s/
(W regexp) You used a backslash-character combination which is not
recognized by Perl. This combination appears in an interpolated variable or
(W untie) A copy of the object returned from C<tie> (or C<tied>) was
still valid when C<untie> was called.
-=item Useless (?%s) - use /%s modifier in regex; marked by <-- HERE in m/%s/
+=item Useless (?%s) - use /%s modifier in regex;
+
+marked by <-- HERE in m/%s/
(W regexp) You have used an internal modifier such as (?o) that has no
meaning unless applied to the entire regexp:
The <-- HERE shows in the regular expression about
where the problem was discovered. See L<perlre>.
-=item Useless (?-%s) - don't use /%s modifier in regex; marked by <-- HERE in m/%s/
+=item Useless (?-%s) - don't use /%s modifier in regex;
+
+marked by <-- HERE in m/%s/
(W regexp) You have used an internal modifier such as (?-o) that has no
meaning unless removed from the entire regexp:
(W) You did C<use re;> without any arguments. That isn't very useful.
+=item Useless use of sort in scalar context
+
+(W void) You used sort in scalar context, as in :
+
+ my $x = sort @y;
+
+This is not very useful, and perl currently optimizes this away.
+
=item Useless use of %s with no values
(W syntax) You used the push() or unshift() function with no arguments
(D deprecated) You are now encouraged to use the explicitly quoted form
if you wish to use an empty line as the terminator of the here-document.
+=item Use of /c modifier is meaningless in s///
+
+(W regexp) You used the /c modifier in a substitution. The /c
+modifier is not presently meaningful in substitutions.
+
+=item Use of /c modifier is meaningless without /g
+
+(W regexp) You used the /c modifier with a regex operand, but didn't
+use the /g modifier. Currently, /c is meaningful only when /g is
+used. (This may change in the future.)
+
+=item Use of /g modifier is meaningless in split
+
+(W regexp) You used the /g modifier on the pattern for a C<split>
+operator. Since C<split> always tries to match the pattern
+repeatedly, the C</g> has no effect.
+
+=item Use of *glob{FILEHANDLE} is deprecated
+
+(D deprecated) You are now encouraged to use the shorter *glob{IO} form
+to access the filehandle slot within a typeglob.
+
+=item Use of chdir('') or chdir(undef) as chdir() deprecated
+
+(D deprecated) chdir() with no arguments is documented to change to
+$ENV{HOME} or $ENV{LOGDIR}. chdir(undef) and chdir('') share this
+behavior, but that has been deprecated. In future versions they
+will simply fail.
+
+Be careful to check that what you pass to chdir() is defined and not
+blank, else you might find yourself in your home directory.
+
=item Use of implicit split to @_ is deprecated
(D deprecated) It makes a lot of work for the compiler when you clobber
you should remove AutoLoader from @ISA and change C<use AutoLoader;> to
C<use AutoLoader 'AUTOLOAD';>.
+=item Use of -l on filehandle %s
+
+(W io) A filehandle represents an opened file, and when you opened the file
+it already went past any symlink you are presumably trying to look for.
+The operation returned C<undef>. Use a filename instead.
+
+=item Use of "package" with no arguments is deprecated
+
+(D deprecated) You used the C<package> keyword without specifying a package
+name. So no namespace is current at all. Using this can cause many
+otherwise reasonable constructs to fail in baffling ways. C<use strict;>
+instead.
+
=item Use of %s in printf format not supported
(F) You attempted to use a feature of printf that is accessible from
=item Use of reference "%s" as array index
-(W) You tried to use a reference as an array index; this probably
+(W misc) You tried to use a reference as an array index; this probably
isn't what you mean, because references in numerical context tend
to be huge numbers, and so usually indicates programmer error.
suppressed for subroutine names by either adding a C<&> prefix, or using
a package qualifier, e.g. C<&our()>, or C<Foo::our()>.
+=item Use of tainted arguments in %s is deprecated
+
+(W taint) You have supplied C<system()> or C<exec()> with multiple
+arguments and at least one of them is tainted. This used to be allowed
+but will become a fatal error in a future version of perl. Untaint your
+arguments. See L<perlsec>.
+
=item Use of uninitialized value%s
(W uninitialized) An undefined value was used as if it were already
=item Using a hash as a reference is deprecated
-(D deprecated) You tried to use a hash as a reference, as in C<%foo->{"bar"}>
-or C<%$ref->{"hello"}. Versions of perl <= 5.6.1 used to allow this syntax,
-but shouldn't have. It is now deprecated, and will be removed in a future
-version.
+(D deprecated) You tried to use a hash as a reference, as in
+C<< %foo->{"bar"} >> or C<< %$ref->{"hello"} >>. Versions of perl <= 5.6.1
+used to allow this syntax, but shouldn't have. It is now deprecated, and will
+be removed in a future version.
=item Using an array as a reference is deprecated
-(D deprecated) You tried to use an array as a reference, as in C<@foo->[23]>
-or C<@$ref->[99]>. Versions of perl <= 5.6.1 used to allow this syntax, but
-shouldn't have. It is now deprecated, and will be removed in a future version.
+(D deprecated) You tried to use an array as a reference, as in
+C<< @foo->[23] >> or C<< @$ref->[99] >>. Versions of perl <= 5.6.1 used to
+allow this syntax, but shouldn't have. It is now deprecated, and will be
+removed in a future version.
+
+=item UTF-16 surrogate %s
+
+(W utf8) You tried to generate half of an UTF-16 surrogate by
+requesting a Unicode character between the code points 0xD800 and
+0xDFFF (inclusive). That range is reserved exclusively for the use of
+UTF-16 encoding (by having two 16-bit UCS-2 characters); but Perl
+encodes its characters in UTF-8, so what you got is a very illegal
+character. If you really know what you are doing you can turn off
+this warning by C<no warnings 'utf8';>.
=item Value of %s can be "0"; test with defined()
reference variables in outer subroutines are called or referenced, they
are automatically rebound to the current values of such variables.
-=item Variable length lookbehind not implemented in regex; marked by <-- HERE in m/%s/
+=item Variable length lookbehind not implemented in regex;
+
+marked by <-- HERE in m/%s/
(F) Lookbehind is allowed only for subexpressions whose length is fixed and
known at compile time. The <-- HERE shows in the regular expression about
its equivalent C<BEGIN> block found an internal inconsistency with
the version number.
+=item v-string in use/require is non-portable
+
+(W portable) The use of v-strings is non-portable to older, pre-5.6, Perls.
+If you want your scripts to be backward portable, use the floating
+point version number: for example, instead of C<use 5.6.1> say
+C<use 5.006_001>. This of course won't help: the older Perls
+won't suddenly start understanding newer features, but at least
+they will show a sensible error message indicating the required
+minimum version.
+
=item Warning: something's wrong
(W) You passed warn() an empty string (the equivalent of C<warn "">) or
=item Wide character in %s
-(W utf8) Perl met a wide character (>255) when it wasn't expecting one.
+(W utf8) Perl met a wide character (>255) when it wasn't expecting
+one. This warning is by default on for I/O (like print) but can be
+turned off by C<no warnings 'utf8';>. You are supposed to explicitly
+mark the filehandle with an encoding, see L<open> and L<perlfunc/binmode>.
=item write() on closed filehandle %s
(F) The use of an external subroutine as a sort comparison is not yet
supported.
-=item You can't use C<-l> on a filehandle
-
-(F) A filehandle represents an opened file, and when you opened the file
-it already went past any symlink you are presumably trying to look for.
-Use a filename instead.
-
=item YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET!
(F) And you probably never will, because you probably don't have the
sources to your kernel, and your vendor probably doesn't give a rip
-about what you want. Your best bet is to use the wrapsuid script in the
-eg directory to put a setuid C wrapper around your script.
+about what you want. Your best bet is to put a setuid C wrapper around
+your script.
=item You need to quote "%s"