X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperldiag.pod;h=08f342aee11f8db650d1c17e7a1e364dd0e38227;hb=f34840d8d697d9f8be532dea1352cc0aeefc696b;hp=365faa6928187592583c059350efdd9d58c8a33f;hpb=a93751fa40b15f424f91bba70d1533c6b4024e42;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/pod/perldiag.pod b/pod/perldiag.pod
index 365faa6..08f342a 100644
--- a/pod/perldiag.pod
+++ b/pod/perldiag.pod
@@ -1,3 +1,4 @@
+//depot/perl/pod/perldiag.pod#272 - edit change 14824 (text)
 =head1 NAME
 
 perldiag - various Perl diagnostics
@@ -182,17 +183,26 @@ spots.  This is now heavily deprecated.
 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 fixed hash
 
-(F) When C<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 fixed hash.
+
+=item Attempt to clear a fixed hash
+
+(F) It is currently not allowed to clear a fixed hash, even if the
+new hash would contain the same keys as before.  This may change in
+the future.
 
-=item Attempt to access to key '%_' in fixed hash
+=item Attempt to delete readonly key '%s' from a fixed hash
 
-(F) A hash has been marked as READONLY at the C level to turn it
-into a "record" with a fixed set of keys. The failing code
-has attempted to get or set the value of a key which does not
-exist or to delete a key.
+(F) The failing code attempted to delete a key whose value has been
+declared readonly from a fixed hash.
+
+=item Attempt to delete disallowed key '%s' from a fixed hash
+
+(F) The failing code attempted to delete from a fixed hash a key which
+is not in its key set.
 
 =item Attempt to bless into a reference
 
@@ -543,9 +553,9 @@ quotas or other plumbing problems.
 
 =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"
 
@@ -611,7 +621,7 @@ line.
 
 =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
@@ -673,7 +683,9 @@ editor will have a way to help you find these characters.
 =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
+example \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
 C<\\p> (just the C<\p>) or by C<\Q\p> (the rest of the string, until
 possible C<\E>).
 
@@ -1227,6 +1239,11 @@ array is empty, just use C<if (@array) { # not empty }> for example.
 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
@@ -1270,6 +1287,11 @@ you called it with no args and both C<$@> and C<$_> were empty.
 
 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.
@@ -1289,6 +1311,11 @@ something that isn't defined yet, you don't actually have to define the
 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
@@ -1303,7 +1330,9 @@ unlikely to be what you want.
 
 =item Empty %s
 
-(F) Empty C<\p{}> or C<\P{}>.
+(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
 
@@ -1346,6 +1375,10 @@ Perl identifier.  If you're just trying to glob a long list of
 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.
@@ -1467,7 +1500,7 @@ to the end of your file without finding such a line.
 (W redefine) You redefined a format.  To suppress this warning, say
 
     {
-	no warnings;
+	no warnings 'redefine';
 	eval "format NAME =...";
     }
 
@@ -1554,6 +1587,11 @@ version of Perl, and this should not happen anyway.
 (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.
@@ -1605,6 +1643,11 @@ when Perl was built using standard options.  For some reason, your
 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
@@ -1629,17 +1672,17 @@ two from 1 to 32 (or 64, if your platform supports that).
 
 =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"
 
@@ -1665,6 +1708,12 @@ 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 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.
@@ -1794,13 +1843,14 @@ neither as a system call or an ioctl call (SIOCATMARK).
 
 =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
 
@@ -1837,7 +1887,7 @@ L<perlfunc/listen>.
 
 =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.)
 
@@ -1869,10 +1919,21 @@ a builtin library search path, prefix2 is substituted.  The error may
 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
@@ -2007,6 +2068,13 @@ couldn't be created for some peculiar reason.
 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.
@@ -2056,6 +2124,11 @@ provided for this purpose.
 (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
@@ -2190,6 +2263,11 @@ immediately after the switch, without intervening spaces.
 (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
@@ -2285,6 +2363,12 @@ supplied.  See L<perlform>.
 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
@@ -2345,8 +2429,13 @@ See also L<perlport> for writing portable code.
 
 =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
 
@@ -2449,12 +2538,6 @@ package-specific handler.  That name might have a meaning to Perl itself
 some day, even though it doesn't yet.  Perhaps you should use a
 mixed-case attribute name, instead.  See L<attributes>.
 
-=item Package '%s' not found (did you use the incorrect case?)
-
-(W misc) You included a package file via C<use>, but the package name
-did not match the file name. It's possible that you misspelled the
-package name.
-
 =item page overflow
 
 (W io) A single call to write() produced more lines than can fit on a
@@ -2487,7 +2570,7 @@ reference.
 (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.
@@ -2688,7 +2771,7 @@ the result of the value of the environment variable PERLIO.
 =item perlio: invalid separator character %s in attribute list
 
 (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.
+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.
 
@@ -2711,11 +2794,15 @@ value of the environment variable PERLIO.
 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 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;
 
 marked by <-- HERE in m/%s/
 
-(W unsafe) The character class constructs [: :], [= =], and [. .]  go
+(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
@@ -2750,7 +2837,9 @@ 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
 
@@ -2878,9 +2967,14 @@ in L<perlos2>.
 
 =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 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/
@@ -3150,11 +3244,9 @@ account you tested it under), does not rely on any environment variables
 location where the CGI server can't find it, basically, more or less.
 Please see the following for more information:
 
-	http://www.cpan.org/doc/FAQs/cgi/idiots-guide.html
-	http://www.cpan.org/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>.
 
@@ -3241,6 +3333,14 @@ See L<perlfunc/sort>.
 (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
@@ -3271,7 +3371,7 @@ C<can> may break this.
 (W redefine) You redefined a subroutine.  To suppress this warning, say
 
     {
-	no warnings;
+	no warnings 'redefine';
 	eval "sub name { ... }";
     }
 
@@ -3284,13 +3384,13 @@ L<perlop/"Quote and Quote-like Operators">.
 
 =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.
 
@@ -3491,11 +3591,11 @@ BEGIN block.
 
 =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.
@@ -3599,6 +3699,11 @@ Check the #! line, or manually feed your script into Perl yourself.
 (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
 
@@ -3636,6 +3741,15 @@ 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 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
@@ -3844,6 +3958,14 @@ about.
 
 (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
@@ -3863,6 +3985,23 @@ returns no useful value.  See L<perlmod>.
 (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
@@ -3908,6 +4047,12 @@ 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';>.
 
+=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
@@ -3958,6 +4103,13 @@ use, or using a different name altogether.  The warning can be
 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
@@ -3986,6 +4138,16 @@ 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()
 
 (W misc) In a conditional expression, you used <HANDLE>, <*> (glob),
@@ -4122,7 +4284,10 @@ So put in parentheses to say what you really mean.
 
 =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
 
@@ -4149,12 +4314,6 @@ supported.
 (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