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=item Recompile perl with B<-D>DEBUGGING to use B<-D> switch

(S debugging) You can't use the B<-D> option unless the code to produce
the desired output is compiled into Perl, which entails some overhead,
which is why it's currently left out of your copy.

=item Recursive call to Perl_load_module in PerlIO_find_layer

(P) It is currently not permitted to load modules when creating
a filehandle inside an %INC hook.  This can happen with C<open my
$fh, '<', \$scalar>, which implicitly loads PerlIO::scalar.  Try
loading PerlIO::scalar explicitly first.

=item Recursive inheritance detected in package '%s'

(F) While calculating the method resolution order (MRO) of a package, Perl
believes it found an infinite loop in the C<@ISA> hierarchy.  This is a
crude check that bails out after 100 levels of C<@ISA> depth.

=item Redundant argument in %s

(W redundant) You called a function with more arguments than other
arguments you supplied indicated would be needed.  Currently only
emitted when a printf-type format required fewer arguments than were
supplied, but might be used in the future for e.g. L<perlfunc/pack>.

=item refcnt_dec: fd %d%s

=item refcnt: fd %d%s

=item refcnt_inc: fd %d%s

(P) Perl's I/O implementation failed an internal consistency check.  If
you see this message, something is very wrong.

=item Reference found where even-sized list expected

(W misc) You gave a single reference where Perl was expecting a list
with an even number of elements (for assignment to a hash).  This
usually means that you used the anon hash constructor when you meant
to use parens.  In any case, a hash requires key/value B<pairs>.

    %hash = { one => 1, two => 2, };	# WRONG
    %hash = [ qw/ an anon array / ];	# WRONG
    %hash = ( one => 1, two => 2, );	# right
    %hash = qw( one 1 two 2 );			# also fine

=item Reference is already weak

(W misc) You have attempted to weaken a reference that is already weak.
Doing so has no effect.

=item Reference is not weak

(W misc) You have attempted to unweaken a reference that is not weak.
Doing so has no effect.

=item Reference to invalid group 0 in regex; marked by S<<-- HERE> in m/%s/

(F) You used C<\g0> or similar in a regular expression.  You may refer
to capturing parentheses only with strictly positive integers
(normal backreferences) or with strictly negative integers (relative
backreferences).  Using 0 does not make sense.

=item Reference to nonexistent group in regex; marked by S<<-- 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 wanted to have the character with ordinal 7 inserted into the regular
expression, prepend zeroes to make it three digits long: C<\007>

The S<<-- HERE> shows whereabouts in the regular expression the problem was
discovered.

=item Reference to nonexistent named group in regex; marked by S<<-- HERE>
in m/%s/

(F) You used something like C<\k'NAME'> or C<< \k<NAME> >> in your regular
expression, but there is no corresponding named capturing parentheses
such as C<(?'NAME'...)> or C<< (?<NAME>...) >>.  Check if the name has been
spelled correctly both in the backreference and the declaration.

The S<<-- HERE> shows whereabouts in the regular expression the problem was
discovered.

=item Reference to nonexistent or unclosed group in regex; marked by
S<<-- HERE> in m/%s/

(F) You used something like C<\g{-7}> in your regular expression, but there
are not at least seven sets of closed capturing parentheses in the
expression before where the C<\g{-7}> was located.

The S<<-- HERE> shows whereabouts in the regular expression the problem was
discovered.

=item regexp memory corruption

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

=item Regexp modifier "/%c" may appear a maximum of twice

=item Regexp modifier "%c" may appear a maximum of twice in regex; marked
by S<<-- HERE> in m/%s/

(F) The regular expression pattern had too many occurrences
of the specified modifier.  Remove the extraneous ones.

=item Regexp modifier "%c" may not appear after the "-" in regex; marked by <-- 
HERE in m/%s/

(F) Turning off the given modifier has the side effect of turning on
another one.  Perl currently doesn't allow this.  Reword the regular
expression to use the modifier you want to turn on (and place it before
the minus), instead of the one you want to turn off.

=item Regexp modifier "/%c" may not appear twice

=item Regexp modifier "%c" may not appear twice in regex; marked by <--
HERE in m/%s/

(F) The regular expression pattern had too many occurrences
of the specified modifier.  Remove the extraneous ones.

=item Regexp modifiers "/%c" and "/%c" are mutually exclusive

=item Regexp modifiers "%c" and "%c" are mutually exclusive in regex;
marked by S<<-- HERE> in m/%s/

(F) The regular expression pattern had more than one of these
mutually exclusive modifiers.  Retain only the modifier that is
supposed to be there.

=item Regexp out of space in regex m/%s/

(P) A "can't happen" error, because safemalloc() should have caught it
earlier.

=item Repeated format line will never terminate (~~ and @#)

(F) Your format contains the ~~ repeat-until-blank sequence and a
numeric field that will never go blank so that the repetition never
terminates.  You might use ^# instead.  See L<perlform>.

=item Replacement list is longer than search list

(W misc) You have used a replacement list that is longer than the
search list.  So the additional elements in the replacement list
are meaningless.

=item Required parameter '%s' is missing for %s constructor

pod/perldiag.pod  view on Meta::CPAN

=item Unsupported function fork

(F) Your version of executable does not support forking.

Note that under some systems, like OS/2, there may be different flavors
of Perl executables, some of which may support fork, some not.  Try
changing the name you call Perl by to C<perl_>, C<perl__>, and so on.

=item Unsupported script encoding %s

(F) Your program file begins with a Unicode Byte Order Mark (BOM) which
declares it to be in a Unicode encoding that Perl cannot read.

=item Unsupported socket function "%s" called

(F) Your machine doesn't support the Berkeley socket mechanism, or at
least that's what Configure thought.

=item Unterminated '(*...' argument in regex; marked by <-- HERE in m/%s/

(F) You used a pattern of the form C<(*...:...)> but did not terminate
the pattern with a C<)>.  Fix the pattern and retry.

=item Unterminated attribute list

(F) The lexer found something other than a simple identifier at the
start of an attribute, and it wasn't a semicolon or the start of a
block.  Perhaps you terminated the parameter list of the previous
attribute too soon.  See L<attributes>.

=item Unterminated attribute parameter in attribute list

(F) The lexer saw an opening (left) parenthesis character while parsing
an attribute list, but the matching closing (right) parenthesis
character was not found.  You may need to add (or remove) a backslash
character to get your parentheses to balance.  See L<attributes>.

=item Unterminated compressed integer

(F) An argument to unpack("w",...) was incompatible with the BER
compressed integer format and could not be converted to an integer.
See L<perlfunc/pack>.

=item Unterminated '(*...' construct in regex; marked by <-- HERE in m/%s/

(F) You used a pattern of the form C<(*...)> but did not terminate
the pattern with a C<)>.  Fix the pattern and retry.

=item Unterminated delimiter for here document

(F) This message occurs when a here document label has an initial
quotation mark but the final quotation mark is missing.  Perhaps
you wrote:

    <<"foo

instead of:

    <<"foo"

=item Unterminated \g... pattern in regex; marked by S<<-- HERE> in m/%s/

=item Unterminated \g{...} pattern in regex; marked by S<<-- HERE> in m/%s/

(F) In a regular expression, you had a C<\g> that wasn't followed by a
proper group reference.  In the case of C<\g{>, the closing brace is
missing; otherwise the C<\g> must be followed by an integer.  Fix the
pattern and retry.

=item Unterminated <> operator

(F) The lexer saw a left angle bracket in a place where it was expecting
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 Unterminated verb pattern argument in regex; marked by S<<-- HERE> in
m/%s/

(F) You used a pattern of the form C<(*VERB:ARG)> but did not terminate
the pattern with a C<)>.  Fix the pattern and retry.

=item Unterminated verb pattern in regex; marked by S<<-- HERE> in m/%s/

(F) You used a pattern of the form C<(*VERB)> but did not terminate
the pattern with a C<)>.  Fix the pattern and retry.

=item untie attempted while %d inner references still exist

(W untie) A copy of the object returned from C<tie> (or C<tied>) was
still valid when C<untie> was called.

=item Usage: POSIX::%s(%s)

(F) You called a POSIX function with incorrect arguments.
See L<POSIX/FUNCTIONS> for more information.

=item Usage: Win32::%s(%s)

(F) You called a Win32 function with incorrect arguments.
See L<Win32> for more information.

=item $[ used in %s (did you mean $] ?)

(W syntax) You used C<$[> in a comparison, such as:

    if ($[ > 5.006) {
	...
    }

You probably meant to use C<$]> instead.  C<$[> is the base for indexing
arrays.  C<$]> is the Perl version number in decimal.

=item Use "%s" instead of "%s"

(F) The second listed construct is no longer legal.  Use the first one
instead.

=item Useless assignment to a temporary

(W misc) You assigned to an lvalue subroutine, but what
the subroutine returned was a temporary scalar about to
be discarded, so the assignment had no effect.

=item Useless (?-%s) - don't use /%s modifier in regex; marked by
S<<-- HERE> in m/%s/