=item Hexadecimal float: exponent underflow
(W overflow) The hexadecimal floating point has a smaller exponent
-than the floating point supports.
+than the floating point supports. With the IEEE 754 floating point,
+this may also mean that the subnormals (formerly known as denormals)
+are being used, which may or may not be an error.
=item Hexadecimal float: internal error (%s)
=item Initialization of state variables in list context currently forbidden
-(F) Currently the implementation of "state" only permits the
-initialization of scalar variables in scalar context. Re-write
-C<state ($a) = 42> as C<state $a = 42> to change from list to scalar
-context. Constructions such as C<state (@a) = foo()> will be
-supported in a future perl release.
+(F) C<state> only permits initializing a single scalar variable, in scalar
+context. So C<state $a = 42> is allowed, but not C<state ($a) = 42>. To apply
+state semantics to a hash or array, store a hash or array reference in a
+scalar variable.
=item %%s[%s] in scalar context better written as $%s[%s]
largest possible ones break the perl interpreter in some constructs,
including causing it to hang in a few cases. The known problem areas
are in C<tr///>, regular expression pattern matching using quantifiers,
-and as the upper limits in loops.
+as quote delimiters in C<qI<X>...I<X>> (where I<X> is the C<chr()> of a large
+code point), and as the upper limits in loops.
+There may be other breakages as well. If you get this warning, and
+things aren't working correctly, you probably have found one of these.
If your code is to run on various platforms, keep in mind that the upper
limit depends on the platform. It is much larger on 64-bit word sizes
https://perl5.git.perl.org / perl5.git / blobdiff