perldiag.pod

MSYS在windows下模拟了一个类unix的终端

substitution, but stylistically it's better to use the variable form
because other Perl programmers will expect it, and it works better if
there are more than 9 backreferences.

=item Binary number > 0b11111111111111111111111111111111 non-portable

(W portable) The binary number you specified is larger than 2**32-1
(4294967295) and therefore non-portable between systems.  See
L<perlport> for more on portability concerns.

=item bind() on closed socket %s

(W closed) You tried to do a bind on a closed socket.  Did you forget to
check the return value of your socket() call?  See L<perlfunc/bind>.

=item Bit vector size > 32 non-portable

(W portable) Using bit vector sizes larger than 32 is non-portable.

=item Bizarre copy of %s in %s

(P) Perl detected an attempt to copy an internal value that is not
copyable.

=item B<-P> not allowed for setuid/setgid script

(F) The script would have to be opened by the C preprocessor by name,
which provides a race condition that breaks security.

=item Buffer overflow in prime_env_iter: %s

(W internal) A warning peculiar to VMS.  While Perl was preparing to
iterate over %ENV, it encountered a logical name or symbol definition
which was too long, so it was truncated to the string shown.

=item Callback called exit

(F) A subroutine invoked from an external package via call_sv()
exited by calling exit.

=item %s() called too early to check prototype

(W prototype) You've called a function that has a prototype before the
parser saw a definition or declaration for it, and Perl could not check
that the call conforms to the prototype.  You need to either add an
early prototype declaration for the subroutine in question, or move the
subroutine definition ahead of the call to get proper prototype
checking.  Alternatively, if you are certain that you're calling the
function correctly, you may put an ampersand before the name to avoid
the warning.  See L<perlsub>.

=item / cannot take a count

(F) You had an unpack template indicating a counted-length string, but
you have also specified an explicit size for the string.  See
L<perlfunc/pack>.

=item Can't bless non-reference value

(F) Only hard references may be blessed.  This is how Perl "enforces"
encapsulation of objects.  See L<perlobj>.

=item Can't call method "%s" in empty package "%s"

(F) You called a method correctly, and it correctly indicated a package
functioning as a class, but that package doesn't have ANYTHING defined
in it, let alone methods.  See L<perlobj>.

=item Can't call method "%s" on an undefined value

(F) You used the syntax of a method call, but the slot filled by the
object reference or package name contains an undefined value.  Something
like this will reproduce the error:

    $BADREF = undef;
    process $BADREF 1,2,3;
    $BADREF->process(1,2,3);

=item Can't call method "%s" on unblessed reference

(F) A method call must know in what package it's supposed to run.  It
ordinarily finds this out from the object reference you supply, but you
didn't supply an object reference in this case.  A reference isn't an
object reference until it has been blessed.  See L<perlobj>.

=item Can't call method "%s" without a package or object reference

(F) You used the syntax of a method call, but the slot filled by the
object reference or package name contains an expression that returns a
defined value which is neither an object reference nor a package name.
Something like this will reproduce the error:

    $BADREF = 42;
    process $BADREF 1,2,3;
    $BADREF->process(1,2,3);

=item Can't chdir to %s

(F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory
that you can chdir to, possibly because it doesn't exist.

=item Can't check filesystem of script "%s" for nosuid

(P) For some reason you can't check the filesystem of the script for
nosuid.

=item Can't coerce array into hash

(F) You used an array where a hash was expected, but the array has no
information on how to map from keys to array indices.  You can do that
only with arrays that have a hash reference at index 0.

=item Can't coerce %s to integer in %s

(F) Certain types of SVs, in particular real symbol table entries
(typeglobs), can't be forced to stop being what they are.  So you can't
say things like:

    *foo += 1;

You CAN say

    $foo = *foo;
    $foo += 1;

but then $foo no longer contains a glob.

=item Can't coerce %s to number in %s

(F) Certain types of SVs, in particular real symbol table entries
(typeglobs), can't be forced to stop being what they are.

=item Can't coerce %s to string in %s

(F) Certain types of SVs, in particular real symbol table entries
(typeglobs), can't be forced to stop being what they are.

=item Can't create pipe mailbox

(P) An error peculiar to VMS.  The process is suffering from exhausted
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.

=item Can't declare %s in "%s"

(F) Only scalar, array, and hash variables may be declared as "my" or
"our" variables.  They must have ordinary identifiers as names.

=item Can't do inplace edit: %s is not a regular file

(S inplace) You tried to use the B<-i> switch on a special file, such as
a file in /dev, or a FIFO.  The file was ignored.

=item Can't do inplace edit on %s: %s

(S inplace) The creation of the new file failed for the indicated
reason.

=item Can't do inplace edit without backup

(F) You're on a system such as MS-DOS that gets confused if you try
reading from a deleted (but still opened) file.  You have to say
C<-i.bak>, or some such.

=item Can't do inplace edit: %s would not be unique

(S inplace) Your filesystem does not support filenames longer than 14
characters and Perl was unable to create a unique filename during
inplace editing with the B<-i> switch.  The file was ignored.

=item Can't do {n,m} with n > m before << HERE in regex m/%s/

(F) Minima must be less than or equal to maxima. If you really want your
regexp to match something 0 times, just put {0}. The << HERE shows in the
regular expression about where the problem was discovered. See L<perlre>.

=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
waitpid() without flags is emulated.

=item Can't emulate -%s on #! line

(F) The #! line specifies a switch that doesn't make sense at this
point.  For example, it'd be kind of silly to put a B<-x> on the #!
line.

=item Can't exec "%s": %s

(W exec) An 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
architecture, or the #! line in a script points to an interpreter that
can't be run for similar reasons.  (Or maybe your system doesn't support
#! at all.)

=item Can't exec %s

(F) Perl was trying to execute the indicated program for you because
that's what the #! line said.  If that's not what you wanted, you may
need to mention "perl" on the #! line somewhere.

=item Can't execute %s

(F) You used the B<-S> switch, but the copies of the script to execute
found in the PATH did not have correct permissions.

=item Can't find an opnumber for "%s"

(F) A string of a form C<CORE::word> was given to prototype(), but there
is no builtin with the name C<word>.

=item Can't find label %s

(F) You said to goto a label that isn't mentioned anywhere that it's
possible for us to go to.  See L<perlfunc/goto>.

=item Can't find %s on PATH

(F) You used the B<-S> switch, but the script to execute could not be
found in the PATH.

=item Can't find %s on PATH, '.' not in PATH

(F) You used the B<-S> switch, but the script to execute could not be
found in the PATH, or at least not with the correct permissions.  The
script exists in the current directory, but PATH prohibits running it.

=item Can't find string terminator %s anywhere before EOF

(F) Perl strings can stretch over multiple lines.  This message means
that the closing delimiter was omitted.  Because bracketed quotes count
nesting levels, the following is missing its final parenthesis:

    print q(The character '(' starts a side comment.);

If you're getting this error from a here-document, you may have included
unseen whitespace before or after your closing tag. A good programmer's
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
C<\\p> (just the C<\p>) or by C<\Q\p> (the rest of the string, until
possible C<\E>).

=item Can't fork

(F) A fatal error occurred while trying to fork while opening a
pipeline.

=item Can't get filespec - stale stat buffer?

(S) A warning peculiar to VMS.  This arises because of the difference
between access checks under VMS and under the Unix model Perl assumes.
Under VMS, access checks are done by filename, rather than by bits in
the stat buffer, so that ACLs and other protections can be taken into
account.  Unfortunately, Perl assumes that the stat buffer contains all
the necessary information, and passes it, instead of the filespec, to
the access checking routine.  It will try to retrieve the filespec using
the device name and FID present in the stat buffer, but this works only
if you haven't made a subsequent call to the CRTL stat() routine,
because the device name is overwritten with each call.  If this warning
appears, the name lookup failed, and the access checking routine gave up
and returned FALSE, just to be conservative.  (Note: The access checking
routine knows about the Perl C<stat> operator and file tests, so you
shouldn't ever see this warning in response to a Perl command; it arises
only if some internal code takes stat buffers lightly.)

=item Can't get pipe mailbox device name

(P) An error peculiar to VMS.  After creating a mailbox to act as a
pipe, Perl can't retrieve its name for later use.

=item Can't get SYSGEN parameter value for MAXBUF

(P) An error peculiar to VMS.  Perl asked $GETSYI how big you want your
mailbox buffers to be, and didn't get an answer.

=item Can't "goto" into the middle of a foreach loop

(F) A "goto" statement was executed to jump into the middle of a foreach
loop.  You can't get there from here.  See L<perlfunc/goto>.

=item Can't "goto" out of a pseudo block

(F) A "goto" statement was executed to jump out of what might look like
a block, except that it isn't a proper block.  This usually occurs if
you tried to jump out of a sort() block or subroutine, which is a no-no.
See L<perlfunc/goto>.

=item Can't goto subroutine from an eval-string

(F) The "goto subroutine" call can't be used to jump out of an eval
"string".  (You can use it to jump out of an eval {BLOCK}, but you
probably don't want to.)

=item Can't goto subroutine outside a subroutine

(F) The deeply magical "goto subroutine" call can only replace one
subroutine call for another.  It can't manufacture one out of whole
cloth.  In general you should be calling it out of only an AUTOLOAD
routine anyway.  See L<perlfunc/goto>.

=item Can't ignore signal CHLD, forcing to default

(W signal) Perl has detected that it is being run with the SIGCHLD
signal (sometimes known as SIGCLD) disabled.  Since disabling this
signal will interfere with proper determination of exit status of child
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 "last" outside a loop block

(F) A "last" statement was executed to break out of the current block,
except that there's this itty bitty problem called there isn't a current
block.  Note that an "if" or "else" block doesn't count as a "loopish"
block, as doesn't a block given to sort(), map() or grep().  You can
usually double the curlies to get the same effect though, because the
inner curlies will be considered a block that loops once.  See
L<perlfunc/last>.

=item Can't localize lexical variable %s

(F) You used local on a variable name that was previously declared as a
lexical variable using "my".  This is not allowed.  If you want to
localize a package variable of the same name, qualify it with the
package name.

=item Can't localize pseudo-hash element

(F) You said something like C<< local $ar->{'key'} >>, where $ar is a
reference to a pseudo-hash.  That hasn't been implemented yet, but you
can get a similar effect by localizing the corresponding array element
directly -- C<< local $ar->[$ar->[0]{'key'}] >>.

=item Can't localize through a reference