X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperldiag.pod;h=3963e7e3d4491c0a10bf00cb0f0d78bbd226fb57;hb=bdbb64c22f35e0b11cf29ddb2597039baf475c01;hp=cb82633194d1b9c776f4c4015594c5cc1629bcff;hpb=609122bd053b77225626a0b7630039ddc39620ae;p=p5sagit%2Fp5-mst-13.2.git diff --git a/pod/perldiag.pod b/pod/perldiag.pod index cb82633..3963e7e 100644 --- a/pod/perldiag.pod +++ b/pod/perldiag.pod @@ -8,7 +8,7 @@ These messages are classified as follows (listed in increasing order of desperation): (W) A warning (optional). - (D) A deprecation (optional). + (D) A deprecation (enabled by default). (S) A severe warning (enabled by default). (F) A fatal error (trappable). (P) An internal error you should never see (trappable). @@ -115,8 +115,8 @@ which 'splits' output into two streams, such as (W misc) The pattern match (C), substitution (C), and transliteration (C) 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 +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 you meant to do. See L and L for alternatives. @@ -306,7 +306,21 @@ of an array and later assigning through that reference. For example used as an lvalue, which is pretty strange. Perhaps you forgot to dereference it first. See L. -=item Bad arg length for %s, is %d, should be %s +=item Attribute "locked" is deprecated + +(D deprecated) You have used the attributes pragam to modify the "locked" +attribute on a code reference. The :locked attribute is obsolete, has had no +effect since 5005 threads were removed, and will be removed in the next major +release of Perl 5. + +=item Attribute "unique" is deprecated + +(D deprecated) You have used the attributes pragam to modify the "unique" +attribute on an array, hash or scalar reference. The :unique attribute has +had no effect since Perl 5.8.8, and will be removed in the next major +release of Perl 5. + +=item Bad arg length for %s, is %d, should be %d (F) You passed a buffer of the wrong size to one of msgctl(), semctl() or shmctl(). In C parlance, the correct sizes are, respectively, @@ -359,6 +373,11 @@ is not the same as $var = 'myvar'; $sym = "mypack::$var"; +=item Bad plugin affecting keyword '%s' + +(F) An extension using the keyword plugin mechanism violated the +plugin API. + =item Bad realloc() ignored (S malloc) An internal routine called realloc() on something that had @@ -507,6 +526,11 @@ from that type of reference to a typeglob. (P) Perl detected an attempt to copy a value to an internal type that cannot be directly assigned not. +=item Cannot find encoding "%s" + +(S io) You tried to apply an encoding that did not exist to a filehandle, +either with open() or binmode(). + =item Can only compress unsigned integers in pack (F) An argument to pack("w",...) was not an integer. The BER compressed @@ -651,24 +675,6 @@ inplace editing with the B<-i> switch. The file was ignored. regexp to match something 0 times, just put {0}. The <-- HERE shows in the regular expression about where the problem was discovered. See L. -=item Can't do setegid! - -(P) The setegid() call failed for some reason in the setuid emulator of -suidperl. - -=item Can't do seteuid! - -(P) The setuid emulator of suidperl failed for some reason. - -=item Can't do setuid - -(F) This typically means that ordinary perl tried to exec suidperl to do -setuid emulation, but couldn't exec it. It looks for a name of the form -sperl5.000 in the same directory that the perl executable resides under -the name perl5.000, typically /usr/local/bin on Unix machines. If the -file is there, check the execute permissions. If it isn't, ask your -sysadmin why he and/or she removed it. - =item Can't do waitpid with flags (F) This machine doesn't have either waitpid() or wait4(), so only @@ -716,9 +722,9 @@ is no builtin with the name C. =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 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 or C prefix? +could not be found. Maybe you misspelled the name of the property? +See L +for a complete list of available properties. =item Can't find label %s @@ -751,17 +757,24 @@ editor will have a way to help you find these characters. =item Can't find Unicode property definition "%s" (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 for the list of known properties. +example C<\p{Lu}> matches all uppercase letters). If you did mean to use a +Unicode property, see +L +for a complete list of available 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 +=item Can't fork: %s (F) A fatal error occurred while trying to fork while opening a pipeline. +=item Can't fork, trying again in 5 seconds + +(W pipe) A fork in a piped open failed with EAGAIN and will be retried +after five seconds. + =item Can't get filespec - stale stat buffer? (S) A warning peculiar to VMS. This arises because of the difference @@ -829,6 +842,12 @@ processes, Perl has reset the signal to its default value. This situation typically indicates that the parent program under which Perl may be running (e.g. cron) is being very careless. +=item Can't kill a non-numeric process ID + +(F) Process identifiers must be (signed) integers. It is a fatal error to +attempt to kill() an undefined, empty-string or otherwise non-numeric +process identifier. + =item Can't "last" outside a loop block (F) A "last" statement was executed to break out of the current block, @@ -1031,17 +1050,12 @@ probably because you don't have write permission to the directory. (P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried to reopen it to accept binary data. Alas, it failed. -=item Can't resolve method `%s' overloading `%s' in package `%s' +=item Can't resolve method "%s" overloading "%s" in package "%s" (F|P) Error resolving overloading specified by a method name (as opposed to a subroutine reference): no such method callable via the package. If method name is C, this is an internal error. -=item Can't reswap uid and euid - -(P) The setreuid() call failed for some reason in the setuid emulator of -suidperl. - =item Can't return %s from lvalue subroutine (F) Perl detected an attempt to return illegal lvalues (such as @@ -1066,11 +1080,6 @@ list context. (P) For some reason you can't fstat() the script even though you have it open already. Bizarre. -=item Can't swap uid and euid - -(P) The setreuid() call failed for some reason in the setuid emulator of -suidperl. - =item Can't take log of %g (F) For ordinary real numbers, you can't take the logarithm of a @@ -1150,6 +1159,11 @@ that is already inside a group with a byte-order modifier. For example you cannot force little-endianness on a type that is inside a big-endian group. +=item Can't use keyword '%s' as a label + +(F) You attempted to use a reserved keyword, such as C or C, +as a statement label. This is disallowed since Perl 5.11.0. + =item Can't use "my %s" in sort comparison (F) The global variables $a and $b are reserved for sort comparisons. @@ -1417,6 +1431,9 @@ L. infinite recursion, unless you're writing strange benchmark programs, in which case it indicates something else. +This threshold can be changed from 100, by recompiling the F binary, +setting the C pre-processor macro C to the desired value. + =item defined(@array) is deprecated (D deprecated) defined() is not usually useful on arrays because it @@ -1624,7 +1641,7 @@ variable and glob that. (F) The C function is not implemented in MacPerl. See L. -=item Execution of %s aborted due to compilation errors +=item Execution of %s aborted due to compilation errors. (F) The final summary message when a Perl compilation fails. @@ -1832,6 +1849,12 @@ a term, so it's looking for the corresponding right angle bracket, and not finding it. Chances are you left some needed parentheses out earlier in the line, and you really meant a "less than". +=item gmtime(%.0f) too large + +(W overflow) You called C with an number that was beyond the 64-bit +range that it accepts, and some rounding resulted. This warning is also +triggered with nan (the special not-a-number value). + =item Got an error from DosAllocMem (P) An error peculiar to OS/2. Most probably you're using an obsolete @@ -1848,7 +1871,7 @@ unspecified destination. See L. supposed to follow something: a template character or a ()-group. See L. -=item %s had compilation errors +=item %s had compilation errors. (F) The final summary message when a C fails. @@ -1908,8 +1931,8 @@ 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 \. +(W illegalproto) An illegal character was found in a prototype declaration. +Legal characters in prototypes are $, @, %, *, ;, [, ], &, and \. =item Illegal declaration of anonymous subroutine @@ -1951,7 +1974,7 @@ two from 1 to 32 (or 64, if your platform supports that). (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 +=item Illegal switch in PERL5OPT: -%c (X) The PERL5OPT environment variable may only be used to set the following switches: B<-[CDIMUdmtw]>. @@ -2173,7 +2196,7 @@ strange for a machine that supports C. (W unopened) You tried ioctl() on a filehandle that was never opened. Check you control flow and number of arguments. -=item IO layers (like "%s") unavailable +=item IO layers (like '%s') unavailable (F) Your Perl has not been configured to have PerlIO, and therefore you cannot use IO layers. To have PerlIO Perl must be configured @@ -2186,13 +2209,17 @@ neither as a system call or an ioctl call (SIOCATMARK). =item $* is no longer supported -(S deprecated, syntax) The special variable C<$*>, deprecated in older perls, has -been removed as of 5.9.0 and is no longer supported. You should use the -C and C regexp modifiers instead. +(D deprecated, syntax) The special variable C<$*>, deprecated in older perls, has +been removed as of 5.9.0 and is no longer supported. In previous versions of perl the use of +C<$*> enabled or disabled multi-line matching within a string. + +Instead of using C<$*> you should use the C (and maybe C) regexp +modifiers. (In older versions: when C<$*> was set to a true value then all regular +expressions behaved as if they were written using C.) =item $# is no longer supported -(S deprecated, syntax) The special variable C<$#>, deprecated in older perls, has +(D deprecated, syntax) The special variable C<$#>, deprecated in older perls, has been removed as of 5.9.3 and is no longer supported. You should use the printf/sprintf functions instead. @@ -2240,12 +2267,31 @@ effective uids or gids failed. length/code combination tried to obtain more data. This results in an undefined value for the length. See L. +=item Lexing code attempted to stuff non-Latin-1 character into Latin-1 input + +(F) An extension is attempting to insert text into the current parse +(using L or similar), but +tried to insert a character that couldn't be part of the current input. +This is an inherent pitfall of the stuffing mechanism, and one of the +reasons to avoid it. Where it is necessary to stuff, stuffing only +plain ASCII is recommended. + +=item Lexing code internal error (%s) + +(F) Lexing code supplied by an extension violated the lexer's API in a +detectable way. + =item listen() on closed socket %s (W closed) You tried to do a listen on a closed socket. Did you forget to check the return value of your socket() call? See L. +=item localtime(%.0f) too large + +(W overflow) You called C with an number that was beyond the +64-bit range that it accepts, and some rounding resulted. This warning is also triggered with nan (the special not-a-number value). + =item Lookbehind longer than %d not implemented in regex m/%s/ (F) There is currently a limit on the length of string which lookbehind can @@ -2266,6 +2312,14 @@ You may wish to switch to using L explicitly. by that? lstat() makes sense only on filenames. (Perl did a fstat() instead on the filehandle.) +=item lvalue attribute ignored after the subroutine has been defined + +(W misc) Making a subroutine an lvalue subroutine after it has been defined +by declaring the subroutine with a lvalue attribute is not +possible. To make the the subroutine a lvalue subroutine add the +lvalue attribute to the definition, or put the the declaration before +the definition. + =item Lvalue subs returning %s not implemented yet (F) Due to limitations in the current implementation, array and hash @@ -2321,7 +2375,7 @@ See also L. =item Malformed UTF-16 surrogate -Perl thought it was reading UTF-16 encoded character data but while +(F) Perl thought it was reading UTF-16 encoded character data but while doing it Perl met a malformed Unicode surrogate. =item Malformed UTF-8 string in pack @@ -2339,9 +2393,9 @@ rules and perl was unable to guess how to make more progress. (F) You tried to unpack something that didn't comply with UTF-8 encoding rules and perl was unable to guess how to make more progress. -=item Maximal count of pending signals (%s) exceeded +=item Maximal count of pending signals (%d) exceeded -(F) Perl aborted due to a too important number of signals pending. This +(F) Perl aborted due to a too high number of signals pending. This usually indicates that your operating system tried to deliver signals too fast (with a very high priority), starving the perl process from resources it would need to reach a point where it can process signals @@ -2386,6 +2440,11 @@ ended earlier on the current line. (W syntax) An underscore (underbar) in a numeric constant did not separate two digits. +=item Missing argument in %s + +(W uninitialized) A printf-type format required more arguments than were +supplied. + =item Missing argument to -%c (F) The argument to the indicated command line switch must follow @@ -2430,7 +2489,7 @@ can vary from one line to the next. =item Missing right brace on %s -(F) Missing right brace in C<\p{...}> or C<\P{...}>. +(F) Missing right brace in C<\x{...}>, C<\p{...}> or C<\P{...}>. =item Missing right curly or square bracket @@ -2484,7 +2543,7 @@ couldn't be created for some peculiar reason. you omitted the name of the module. Consult L for full details about C<-M> and C<-m>. -=item More than one argument to open +=item More than one argument to '%s' open (F) The C 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 @@ -2995,6 +3054,17 @@ the string being unpacked. See L. the string being unpacked. The string being unpacked was also invalid UTF-8. See L. +=item Overloaded dereference did not return a reference + +(F) An object with an overloaded dereference operator was dereferenced, +but the overloaded operation did not return a reference. See +L. + +=item Overloaded qr did not return a REGEXP + +(F) An object with a C overload was used as part of a match, but the +overloaded operation didn't return a compiled regexp. See L. + =item %s package attribute may clash with future reserved word: %s (W reserved) A lowercase attribute name was used that had a @@ -3211,6 +3281,11 @@ at run time. (P) Something tried to call utf16_to_utf8 with an odd (as opposed to even) byte length. +=item panic: utf16_to_utf8_reversed: odd bytelen + +(P) Something tried to call utf16_to_utf8_reversed with an odd (as opposed +to even) byte length. + =item panic: yylex (P) The lexer got into a bad state while processing a case modifier. @@ -3255,6 +3330,13 @@ so it was not possible to set up some or all fixed-width byte-order conversion functions. This is only a problem when you're using the '<' or '>' modifiers in (un)pack templates. See L. +=item Perl_pmflag() is deprecated, and will be removed from the XS API + +(D deprecated) XS code called the C function C. This was part of +Perl's listed public API for extending or embedding the perl interpreter. It has +now been removed from the public API, and will be removed in a future release, +hence XS code should be re-written not to use it. + =item Perl %s required--this is only version %s, stopped (F) The module in question uses features of a version of Perl more @@ -3292,10 +3374,6 @@ the problem, however, you will get the same error message each time you run Perl. How to really fix the problem can be found in L section B. -=item Permission denied - -(F) The setuid emulator in suidperl decided you were up to no good. - =item pid %x not a child (W exec) A warning peculiar to VMS. Waitpid() was asked to wait for a @@ -3431,24 +3509,6 @@ If instead you intended to match the word 'foo' at the end of the line followed by whitespace and the word 'bar' on the next line then you can use C (for example: C). -=item pragma "attrs" is deprecated, use "sub NAME : ATTRS" instead - -(D deprecated) You have written something like this: - - sub doit - { - use attrs qw(locked); - } - -You should use the new declaration syntax instead. - - sub doit : locked - { - ... - -The C pragma is now obsolete, and is only provided for -backward-compatibility. See L. - =item Precedence problem: open %s should be open(%s) (S precedence) The old irregular construct @@ -3488,7 +3548,7 @@ in L. =item Prototype after '%c' for %s : %s -(W syntax) A character follows % or @ in a prototype. This is useless, +(W illegalproto) A character follows % or @ in a prototype. This is useless, since % and @ gobble the rest of the subroutine arguments. =item Prototype mismatch: %s vs %s @@ -3675,14 +3735,6 @@ always comes last, to avoid ambiguity with subsequent unary operators. (W io) The dirhandle you tried to do a rewinddir() on is either closed or not really a dirhandle. Check your control flow. -=item Runaway format - -(F) Your format contained the ~~ repeat-until-blank sequence, but it -produced 200 lines at once, and the 200th line looked exactly like the -199th line. Apparently you didn't arrange for the arguments to exhaust -themselves, either by using ^ instead of @ (for scalar variables), or by -shifting or popping (for array variables). See L. - =item Scalars leaked: %d (P) Something went wrong in Perl's internal bookkeeping of scalars: @@ -3720,11 +3772,6 @@ as a list, you need to look into how references work, because Perl will not magically convert between scalars and lists for you. See L. -=item Script is not setuid/setgid in suidperl - -(F) Oddly, the suidperl program was invoked on a script without a setuid -or setgid bit set. This doesn't make much sense. - =item Search pattern not terminated (F) The lexer couldn't find the final delimiter of a // or m{} @@ -3927,17 +3974,17 @@ superfluous. (W signal) The signal handler named in %SIG doesn't, in fact, exist. Perhaps you put it into the wrong package? +=item Smart matching a non-overloaded object breaks encapsulation + +(F) You should not use the C<~~> operator on an object that does not +overload it: Perl refuses to use the object's underlying structure for +the smart match. + =item sort is now a reserved word (F) An ancient error message that almost nobody ever runs into anymore. But before sort was a keyword, people sometimes used it as a filehandle. -=item Sort subroutine didn't return a numeric value - -(F) A sort comparison routine must return a number. You probably blew -it by not using C<< <=> >> or C, or by not using them correctly. -See L. - =item Sort subroutine didn't return single value (F) A sort comparison subroutine may not return a list value with more @@ -3970,7 +4017,7 @@ a block by itself. (W unopened) You tried to use the stat() function on a filehandle that was either never opened or has since been closed. -=item Stub found while resolving method "%s" overloading "%s" +=item Stub found while resolving method "%s" overloading "%s" in package "%s" (P) Overloading resolution over @ISA tree may be broken by importation stubs. Stubs should never be implicitly created, but explicit calls to @@ -4012,11 +4059,6 @@ length of the string. See L. This warning is fatal if substr is used in an lvalue context (as the left hand side of an assignment or as a subroutine argument for example). -=item suidperl is no longer needed since %s - -(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 sv_upgrade from type %d down to type %d (P) Perl tried to force the upgrade an SV to a type which was actually @@ -4186,18 +4228,18 @@ suspect you're not running on Unix. =item "-T" is on the #! line, it must also be used on the command line (X) The #! line (or local equivalent) in a Perl script contains the -B<-T> option, but Perl was not invoked with B<-T> in its command line. +B<-T> option (or the B<-t> option), but Perl was not invoked with B<-T> in its command line. This is an error because, by the time Perl discovers a B<-T> in a script, it's too late to properly taint everything from the environment. So Perl gives up. If the Perl script is being executed as a command using the #! mechanism (or its local equivalent), this error can usually be fixed by -editing the #! line so that the B<-T> option is a part of Perl's first -argument: e.g. change C to C. +editing the #! line so that the B<-%c> option is a part of Perl's first +argument: e.g. change C to C. If the Perl script is being executed as C, then the -B<-T> option must appear on the command line: C. +B<-%c> option must appear on the command line: C. =item To%s: illegal mapping '%s' @@ -4218,8 +4260,15 @@ system call to call, silly dilly. =item Too late for "-%s" option (X) The #! line (or local equivalent) in a Perl script contains the -B<-M>, B<-m> or B<-C> option. This is an error because those options -are not intended for use inside scripts. Use the C pragma instead. +B<-M>, B<-m> or B<-C> option. + +In the case of B<-M> and B<-m>, this is an error because those options are +not intended for use inside scripts. Use the C pragma instead. + +The B<-C> option only works if it is specified on the command line as well +(with the same sequence of letters or numbers following). Either specify +this option on the command line, or, if your system supports it, make your +script executable and run it directly instead of passing it to perl. =item Too late to run %s block @@ -4355,11 +4404,16 @@ 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 +=item Unicode non-character %s is illegal for interchange -(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. +(W utf8) Certain codepoints, such as U+FFFE and U+FFFF, are defined by the +Unicode standard to be non-characters. Those are legal codepoints, but are +reserved for internal use; so, applications shouldn't attempt to exchange +them. In some cases, this message is also given if you use a codepoint that +isn't in Unicode--that is it is above the legal maximum of U+10FFFF. These +aren't legal at all in Unicode, so they are illegal for interchange, but can be +used internally in a Perl program. If you know what you are doing you can turn +off this warning by C. =item Unknown BYTEORDER @@ -4458,10 +4512,10 @@ reserved word. It's best to put such a word in quotes, or capitalize it somehow, or insert an underbar into it. You might also declare it as a subroutine. -=item Unrecognized character %s in column %d +=item Unrecognized character %s; marked by <-- HERE after %s near column %d (F) The Perl parser has no idea what to do with the specified character -in your Perl script (or eval) at the specified column. Perhaps you tried +in your Perl script (or eval) near the specified column. Perhaps you tried to run a compressed script, a binary program, or a directory as a Perl program. =item Unrecognized escape \\%c in character class passed through in regex; marked by <-- HERE in m/%s/ @@ -4692,14 +4746,19 @@ you can write it as C to avoid this warning. (F) The "use" keyword is recognized and executed at compile time, and returns no useful value. See L. +=item Use of assignment to $[ is deprecated + +(D deprecated) The C<$[> variable (index of the first element in an array) +is deprecated. See L. + =item Use of bare << to mean <<"" is deprecated -(D deprecated, W syntax) You are now encouraged to use the explicitly quoted +(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 comma-less variable list is deprecated -(D deprecated, W syntax) The values you give to a format should be +(D deprecated) The values you give to a format should be separated by commas, not just aligned on a line. =item Use of chdir('') or chdir(undef) as chdir() deprecated @@ -4747,11 +4806,10 @@ to access the filehandle slot within a typeglob. operator. Since C always tries to match the pattern repeatedly, the C has no effect. -=item Use of implicit split to @_ is deprecated +=item Use of "goto" to jump into a construct is deprecated -(D deprecated, W syntax) It makes a lot of work for the compiler when you -clobber a subroutine's argument list, so it's better if you assign the results -of a split() explicitly to an array (or list). +(D deprecated) Using C to jump from an outer scope into an inner +scope is deprecated and should be avoided. =item Use of inherited AUTOLOAD for non-method %s() is deprecated @@ -4873,7 +4931,7 @@ 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 +character. If you really really know what you are doing you can turn off this warning by C. =item Value of %s can be "0"; test with defined() @@ -5019,7 +5077,7 @@ 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 +(S utf8) Perl met a wide character (>255) when it wasn't expecting one. This warning is by default on for I/O (like print). The easiest way to quiet this warning is simply to add the C<:utf8> layer to the output, e.g. C. Another way to turn off the