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
+
+(F) When vec is called in an lvalue context, the second argument must be
+greater than or equal to zero.
+
=item Attempt to bless into a reference
(F) The CLASSNAME argument to the bless() operator is expected to be
(F) Only hard references may be blessed. This is how Perl "enforces"
encapsulation of objects. See L<perlobj>.
-=item Can't break at that line
-
-(S internal) A warning intended to only be printed while running within
-the debugger, indicating the line number specified wasn't the location
-of a statement that could be stopped at.
-
=item Can't call method "%s" in empty package "%s"
(F) You called a method correctly, and it correctly indicated a package
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 at <HERE< in regex m/%s/
+=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
+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!
filehandles. Are you attempting to call flock() on a dirhandle by the
same name?
-=item Quantifier follows nothing at <HERE< in regex m/%s/
+=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
+meant it literally. The << HERE shows in the regular expression about where the
problem was discovered. See L<perlre>.
=item Format not terminated
potentially supplied) by the user. The script must set the path to a
known value, using trustworthy data. See L<perlsec>.
-=item In string, @%s now must be written as \@%s
-
-(F) It used to be that Perl would try to guess whether you wanted an
-array interpolated or a literal @. It did this when the string was
-first used at runtime. Now strings are parsed at compile time, and
-ambiguous instances of @ must be disambiguated, either by prepending a
-backslash to indicate a literal, or by declaring (or using) the array
-within the program before the string (lexically). (Someday it will
-simply assume that an unbackslashed @ interpolates an array.)
-
=item Integer overflow in %s number
(W overflow) The hexadecimal, octal or binary number you have specified
internally--subject to loss of precision errors in subsequent
operations.
-=item Internal disaster at <HERE< in regex m/%s/
+=item Internal disaster before << HERE in regex m/%s/
(P) Something went badly wrong in the regular expression parser.
-The <HERE< shows in the regular expression about where the problem was
+The << HERE shows in the regular expression about where the problem was
discovered.
Perl is making a guess and treating this C<exec> as a request to
terminate the Perl script and execute the specified command.
-=item Internal urp at <HERE< in regex m/%s/
+=item Internal urp before << HERE in regex m/%s/
-(P) Something went badly awry in the regular expression parser. The <HERE<
+(P) Something went badly awry in the regular expression parser. The <<<HERE
shows in the regular expression about where the problem was discovered.
(F) Your machine apparently doesn't implement ioctl(), which is pretty
strange for a machine that supports C.
+=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
+to a subroutine.
+
+=item `%s' is not an overloadable type
+
+(W) You tried to overload a constant type the overload package is unaware of.
+
=item junk on end of regexp
(P) The regular expression parser is confused.
values cannot be returned in subroutines used in lvalue context. See
L<perlsub/"Lvalue subroutines">.
-=item Lookbehind longer than %d not implemented at <HERE< in reges m/%s/
+=item Lookbehind longer than %d not implemented before << HERE in reges m/%s/
(F) There is currently a limit on the length of string which lookbehind can
-handle. This restriction may be eased in a future release. The <HERE< shows in
+handle. This restriction may be eased in a future release. The << HERE shows in
the regular expression about where the problem was discovered.
-
+
=item Malformed PERLLIB_PREFIX
(F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form
Another way is to assign to a substr() that's off the end of the string.
+Yet another way is to assign to a C<foreach> loop I<VAR> when I<VAR>
+is aliased to a constant in the look I<LIST>:
+
+ $x = 1;
+ foreach my $n ($x, 2) {
+ $n *= 2; # modifies the $x, but fails on attempt to modify the 2
+ }
+
=item Modification of non-creatable array value attempted, %s
(F) You tried to make an array value spring into existence, and the
(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 Nested quantifiers at <HERE< in regex m/%s/
+=item Nested quantifiers before << HERE in regex m/%s/
(F) You can't quantify a quantifier without intervening parentheses. So
-things like ** or +* or ?* are illegal. The <HERE< shows in the regular
+things like ** or +* or ?* are illegal. The << HERE shows in the regular
expression about where the problem was discovered.
Note, however, that the minimal matching quantifiers, C<*?>, C<+?>, and
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.
+
=item Odd number of elements in hash assignment
(W misc) You specified an odd number of elements to initialize a hash,
(S unsafe) The subroutine being declared or defined had previously been
declared or defined with a different function prototype.
-=item Quantifier in {,} bigger than %d at <HERE< in regex m/%s/
+=item Quantifier in {,} bigger than %d before << HERE in regex m/%s/
(F) There is currently a limit to the size of the min and max values of the
-{min,max} construct. The <HERE< shows in the regular expression about where
+{min,max} construct. The << HERE shows in the regular expression about where
the problem was discovered. See L<perlre>.
-=item Quantifier unexpected on zero-length expression at <HERE< in regex m/%s/
+=item Quantifier unexpected on zero-length expression before << HERE in regex m/%s/
(W regexp) You applied a regular expression quantifier in a place where
it makes no sense, such as on a zero-width assertion. Try putting the
(W internal) The internal sv_replace() function was handed a new SV with
a reference count of other than 1.
-=item Reference to nonexistant group at <HERE< in regex m/%s/
+=item Reference to nonexistent group before << HERE in regex 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 value 7 inserted into the regular expression,
prepend a zero to make the number at least two digits: C<\07>
-The <HERE< shows in the regular expression about where the problem was
+The << HERE shows in the regular expression about where the problem was
discovered.
=item regexp memory corruption
(W closed) The socket you're sending to got itself closed sometime
before now. Check your logic flow.
-=item Sequence (? incomplete at <HERE< mark in regex m/%s/
+=item Sequence (? incomplete before << HERE mark in regex m/%s/
-(F) A regular expression ended with an incomplete extension (?. The <HERE<
+(F) A regular expression ended with an incomplete extension (?. The <<<HERE
shows in the regular expression about where the problem was discovered. See
L<perlre>.
(F) If the contents of a (?{...}) clause contains braces, they must balance
for Perl to properly detect the end of the clause. See L<perlre>.
-=item Sequence (?%s...) not implemented at <HERE< mark in regex m/%s/
+=item Sequence (?%s...) not implemented before << HERE mark in regex m/%s/
(F) A proposed regular expression extension has the character reserved but
-has not yet been written. The <HERE< shows in the regular expression about
+has not yet been written. The << HERE shows in the regular expression about
where the problem was discovered. See L<perlre>.
-=item Sequence (?%s...) not recognized at <HERE< mark in regex m/%s/
+=item Sequence (?%s...) not recognized before << HERE mark in regex m/%s/
(F) You used a regular expression extension that doesn't make sense.
-The <HERE< shows in the regular expression about
+The << HERE shows in the regular expression about
where the problem was discovered.
See L<perlre>.
(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 Switch (?(condition)... contains too many branches at <HERE< in regex m/%s/
+=item Switch (?(condition)... contains too many branches before << HERE in regex m/%s/
(F) A (?(condition)if-clause|else-clause) construct can have at most two
branches (the if-clause and the else-clause). If you want one or both to
(?(condition)(?:this|that|other)|else-clause)
-The <HERE< shows in the regular expression about where the problem was
+The << HERE shows in the regular expression about where the problem was
discovered. See L<perlre>.
-=item Switch condition not recognized at <HERE< in regex m/%s/
+=item Switch condition not recognized before << HERE in regex m/%s/
(F) If the argument to the (?(...)if-clause|else-clause) construct is a
-number, it can be only a number. The <HERE< shows in the regular expression
+number, it can be only a number. The << HERE shows in the regular expression
about where the problem was discovered. See L<perlre>.
=item switching effective %s is not implemented
(F) There are no byte-swapping functions for a machine with this byte
order.
-=item Unknown switch condition (?(%.2s at <HERE< in regex m/%s/
+=item Unknown switch condition (?(%.2s before << HERE in regex m/%s/
(F) The condition of a (?(condition)if-clause|else-clause) construct is not
known. The condition may be lookaround (the condition is true if the
code evaluates to a true value), or a number (the condition is true if the
set of capturing parentheses named by the number is defined).
-The <HERE< shows in the regular expression about where the problem was
+The << HERE shows in the regular expression about where the problem was
discovered. See L<perlre>.
=item Unknown open() mode '%s'
data Perl expected. Someone's very confused, or perhaps trying to
subvert Perl's population of %ENV for nefarious purposes.
-=item unmatched [ at <HERE< mark in regex m/%s/
+=item unmatched [ before << HERE mark in regex m/%s/
(F) The brackets around a character class must match. If you wish to
include a closing bracket in a character class, backslash it or put it
-first. See L<perlre>. The <HERE< shows in the regular expression about
+first. See L<perlre>. The << HERE shows in the regular expression about
where the escape was discovered.
-=item unmatched ( in regexp at <HERE< mark in regex m/%s/
+=item unmatched ( in regexp before << HERE mark in regex m/%s/
(F) Unbackslashed parentheses must always be balanced in regular
expressions. If you're a vi user, the % key is valuable for finding the
recognized by Perl inside character classes. The character was
understood literally.
-=item Unrecognized escape \\%c passed through at <HERE< in m/%s/
+=item Unrecognized escape \\%c passed through before << HERE in m/%s/
(W regexp) You used a backslash-character combination which is not
recognized by Perl. This combination appears in an interpolated variable or
a C<'>-delimited regular expression. The character was understood
-literally. The <HERE< shows in the regular expression about where the escape
+literally. The << HERE shows in the regular expression about where the escape
was discovered.
reference variables in outer subroutines are called or referenced, they
are automatically rebound to the current values of such variables.
-=item Variable length lookbehind not implemented at <HERE< in regex m/%s/
+=item Variable length lookbehind not implemented before << HERE in regex m/%s/
(F) Lookbehind is allowed only for subexpressions whose length is fixed and
-known at compile time. The <HERE< shows in the regular expression about where
+known at compile time. The << HERE shows in the regular expression about where
the problem was discovered.
=item Version number must be a constant number