perldiag.pod

MSYS在windows下模拟了一个类unix的终端

See L<perlsub/"Constant Functions"> and L<constant>.

=item Constant subroutine %s redefined

(S|W redefine) You redefined a subroutine which had previously been
eligible for inlining.  See L<perlsub/"Constant Functions"> for
commentary and workarounds.

=item Constant subroutine %s undefined

(W misc) You undefined a subroutine which had previously been eligible
for inlining.  See L<perlsub/"Constant Functions"> for commentary and
workarounds.

=item Copy method did not return a reference

(F) The method which overloads "=" is buggy. See 
L<overload/Copy Constructor>.

=item CORE::%s is not a keyword

(F) The CORE:: namespace is reserved for Perl keywords.

=item corrupted regexp pointers

(P) The regular expression engine got confused by what the regular
expression compiler gave it.

=item corrupted regexp program

(P) The regular expression engine got passed a regexp program without a
valid magic number.

=item Corrupt malloc ptr 0x%lx at 0x%lx

(P) The malloc package that comes with Perl had an internal failure.

=item C<-p> destination: %s

(F) An error occurred during the implicit output invoked by the C<-p>
command-line switch.  (This output goes to STDOUT unless you've
redirected it with select().)

=item C<-T> and C<-B> not implemented on filehandles

(F) Perl can't peek at the stdio buffer of filehandles when it doesn't
know about your kind of stdio.  You'll have to use a filename instead.

=item Deep recursion on subroutine "%s"

(W recursion) This subroutine has called itself (directly or indirectly)
100 times more than it has returned.  This probably indicates an
infinite recursion, unless you're writing strange benchmark programs, in
which case it indicates something else.

=item defined(@array) is deprecated

(D deprecated) defined() is not usually useful on arrays because it
checks for an undefined I<scalar> value.  If you want to see if the
array is empty, just use C<if (@array) { # not empty }> for example.  

=item defined(%hash) is deprecated

(D deprecated) defined() is not usually useful on hashes because it
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 Delimiter for here document is too long

(F) In a here document construct like C<<<FOO>, the label C<FOO> is too
long for Perl to handle.  You have to be seriously twisted to write code
that triggers this error.

=item Did not produce a valid header

See Server error.

=item %s did not return a true value

(F) A required (or used) file must return a true value to indicate that
it compiled correctly and ran its initialization code correctly.  It's
traditional to end such a file with a "1;", though any true value would
do.  See L<perlfunc/require>.

=item (Did you mean &%s instead?)

(W) You probably referred to an imported subroutine &FOO as $FOO or some
such.

=item (Did you mean "local" instead of "our"?)

(W misc) Remember that "our" does not localize the declared global
variable.  You have declared it again in the same lexical scope, which
seems superfluous.

=item (Did you mean $ or @ instead of %?)

(W) You probably said %hash{$key} when you meant $hash{$key} or
@hash{@keys}.  On the other hand, maybe you just meant %hash and got
carried away.

=item Died

(F) You passed die() an empty string (the equivalent of C<die "">) or
you called it with no args and both C<$@> and C<$_> were empty.

=item Document contains no data

See Server error.

=item Don't know how to handle magic of type '%s'

(P) The internal handling of magical variables has been cursed.

=item do_study: out of memory

(P) This should have been caught by safemalloc() instead.

=item (Do you need to predeclare %s?)

(S) This is an educated guess made in conjunction with the message "%s
found where operator expected".  It often means a subroutine or module
name is being referenced that hasn't been declared yet.  This may be
because of ordering problems in your file, or because of a missing
"sub", "package", "require", or "use" statement.  If you're referencing
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 Duplicate free() ignored

(S malloc) An internal routine called free() on something that had
already been freed.

=item elseif should be elsif

(S) There is no keyword "elseif" in Perl because Larry thinks it's ugly.
Your code will be interpreted as an attempt to call a method named
"elseif" for the class returned by the following block.  This is
unlikely to be what you want.

=item entering effective %s failed

(F) While under the C<use filetest> pragma, switching the real and
effective uids or gids failed.

=item Error converting file specification %s

(F) An error peculiar to VMS.  Because Perl may have to deal with file
specifications in either VMS or Unix syntax, it converts them to a
single form when it must operate on them directly.  Either you've passed
an invalid file specification to Perl, or you've found a case the
conversion routines don't handle.  Drat.

=item %s: Eval-group in insecure regular expression

(F) Perl detected tainted data when trying to compile a regular
expression that contains the C<(?{ ... })> zero-width assertion, which
is unsafe.  See L<perlre/(?{ code })>, and L<perlsec>.

=item %s: Eval-group not allowed at run time

(F) Perl tried to compile a regular expression containing the
C<(?{ ... })> zero-width assertion at run time, as it would when the
pattern contains interpolated values.  Since that is a security risk, it
is not allowed.  If you insist, you may still do this by explicitly
building the pattern from an interpolated string at run time and using
that in an eval().  See L<perlre/(?{ code })>.

=item %s: Eval-group not allowed, use re 'eval'

(F) A regular expression contained the C<(?{ ... })> zero-width
assertion, but that construct is only allowed when the C<use re 'eval'>
pragma is in effect.  See L<perlre/(?{ code })>.

=item Excessively long <> operator

(F) The contents of a <> operator may not exceed the maximum size of a
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 Execution of %s aborted due to compilation errors

(F) The final summary message when a Perl compilation fails.

=item Exiting eval via %s

(W exiting) You are exiting an eval by unconventional means, such as a
goto, or a loop control statement.

=item Exiting format via %s

(W exiting) You are exiting an eval by unconventional means, such as a
goto, or a loop control statement.

=item Exiting pseudo-block via %s

(W exiting) You are exiting a rather special block construct (like a
sort block or subroutine) by unconventional means, such as a goto, or a
loop control statement.  See L<perlfunc/sort>.

=item Exiting subroutine via %s

(W exiting) You are exiting a subroutine by unconventional means, such
as a goto, or a loop control statement.

=item Exiting substitution via %s

(W exiting) You are exiting a substitution by unconventional means, such
as a return, a goto, or a loop control statement.

=item Explicit blessing to '' (assuming package main)

(W misc) You are blessing a reference to a zero length string.  This has
the effect of blessing the reference into the package main.  This is
usually not what you want.  Consider providing a default target package,
e.g. bless($ref, $p || 'MyPackage');

=item %s: Expression syntax

(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 %s failed--call queue aborted

(F) An untrapped exception was raised while executing a CHECK, INIT, or
END subroutine.  Processing of the remainder of the queue of such
routines has been prematurely ended.

=item false [] range "%s" in regexp

(W regexp) A character class range must start and end at a literal
character, not another character class like C<\d> or C<[:alpha:]>.  The
"-" in your false range is interpreted as a literal "-".  Consider
quoting the "-",  "\-".  See L<perlre>.

=item Fatal VMS error at %s, line %d

(P) An error peculiar to VMS.  Something untoward happened in a VMS
system service or RTL routine; Perl's exit status should provide more
details.  The filename in "at %s" and the line number in "line %d" tell
you which section of the Perl source code is distressed.

=item fcntl is not implemented

(F) Your machine apparently doesn't implement fcntl().  What is this, a
PDP-11 or something?

=item Filehandle %s opened only for input

(W io) You tried to write on a read-only filehandle.  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 write
the file, use ">" or ">>".  See L<perlfunc/open>.

=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
with "+<" or "+>" or "+>>" instead of with "<" or nothing.  If you
intended only to read from the file, use "<".  See L<perlfunc/open>.

=item Final $ should be \$ or $name

(F) You must now decide whether the final $ in a string was meant to be
a literal dollar sign, or was meant to introduce a variable name that
happens to be missing.  So you have to put either the backslash or the
name.

=item Final @ should be \@ or @name

(F) You must now decide whether the final @ in a string was meant to be
a literal "at" sign, or was meant to introduce a variable name that
happens to be missing.  So you have to put either the backslash or the
name.

=item flock() on closed filehandle %s

(W closed) The filehandle you're attempting to flock() got itself closed
some time before now.  Check your logic flow.  flock() operates on
filehandles.  Are you attempting to call flock() on a dirhandle by the
same name?

=item Quantifier follows nothing before << HERE in regex 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 where the
problem was discovered. See L<perlre>.

=item Format not terminated

(F) A format must be terminated by a line with a solitary dot.  Perl got
to the end of your file without finding such a line.

=item Format %s redefined

(W redefine) You redefined a format.  To suppress this warning, say

    {
	no warnings;
	eval "format NAME =...";
    }

=item Found = in conditional, should be ==

(W syntax) You said

    if ($foo = 123)

when you meant

    if ($foo == 123)

(or something like that).

=item %s found where operator expected

(S) The Perl lexer knows whether to expect a term or an operator.  If it
sees what it knows to be a term when it was expecting to see an
operator, it gives you this warning.  Usually it indicates that an
operator or delimiter was omitted, such as a semicolon.

=item gdbm store returned %d, errno %d, key "%s"

(S) A warning from the GDBM_File extension that a store failed.

=item gethostent not implemented

(F) Your C library apparently doesn't implement gethostent(), probably
because if it did, it'd feel morally obligated to return every hostname
on the Internet.

=item get%sname() on closed socket %s

(W closed) You tried to get a socket or peer socket name on a closed
socket.  Did you forget to check the return value of your socket() call?

=item getpwnam returned invalid UIC %#o for user "%s"

(S) A warning peculiar to VMS.  The call to C<sys$getuai> underlying the
C<getpwnam> operator returned an invalid UIC.

=item getsockopt() on closed socket %s

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

=item Global symbol "%s" requires explicit package name

(F) You've said "use strict vars", which indicates that all variables
must either be lexically scoped (using "my"), declared beforehand using
"our", or explicitly qualified to say which package the global variable
is in (using "::").

=item glob failed (%s)

(W glob) Something went wrong with the external program(s) used for
C<glob> and C<< <*.c> >>.  Usually, this means that you supplied a
C<glob> pattern that caused the external program to fail and exit with a
nonzero status.  If the message indicates that the abnormal exit
resulted in a coredump, this may also mean that your csh (C shell) is
broken.  If so, you should change all of the csh-related variables in