evalbytes => 'evalbytes',
array_base => 'arybase',
current_sub => '__SUB__',
+ lexical_subs => 'lexsubs',
unicode_eval => 'unieval',
unicode_strings => 'unicode',
fc => 'fc',
evalbytes current_sub fc)],
);
+my @experimental = qw( lexical_subs );
+
###########################################################################
# More data generated from the above
print $pm "our %feature = (\n";
my $width = length longest keys %feature;
-for(sort { length $a <=> length $b } keys %feature) {
+for(sort { length $a <=> length $b || $a cmp $b } keys %feature) {
print $pm " $_" . " "x($width-length)
. " => 'feature_$feature{$_}',\n";
}
qq'\$feature_bundle{"$_"} = \$feature_bundle{"$Aliases{$_}"};\n';
};
+print $pm "my \%experimental = (\n";
+print $pm " $_ => 1,\n", for @experimental;
+print $pm ");\n";
+
print $pm <<EOPM;
our \$hint_shift = $HintShift;
EOL
for (
- sort { length $a <=> length $b } keys %feature
+ sort { length $a <=> length $b || $a cmp $b } keys %feature
) {
my($first,$last) =
map { (my $__ = uc) =~ y/.//d; $__ } @{$BundleRanges{$_}};
EOH3
}
- else {
+ elsif ($first) {
print $h <<EOH4;
#define FEATURE_$NAME\_IS_ENABLED \\
( \\
EOH4
}
+ else {
+ print $h <<EOH5;
+#define FEATURE_$NAME\_IS_ENABLED \\
+ ( \\
+ CURRENT_FEATURE_BUNDLE == FEATURE_BUNDLE_CUSTOM && \\
+ FEATURE_IS_ENABLED("$name") \\
+ )
+
+EOH5
+ }
}
print $h <<EOH;
__END__
package feature;
-our $VERSION = '1.30';
+our $VERSION = '1.31';
FEATURES
=head2 Lexical effect
Like other pragmas (C<use strict>, for example), features have a lexical
-effect. C<use feature qw(foo)> will only make the feature "foo" available
+effect. C<use feature qw(foo)> will only make the feature "foo" available
from that point to the end of the enclosing block.
{
This feature is available from Perl 5.16 onwards.
+=head2 The 'lexical_subs' feature
+
+B<WARNING>: This feature is still experimental and the implementation may
+change in future versions of Perl. For this reason, F<feature.pm> will
+warn when you enable the feature, unless you have explicitly disabled the
+warning:
+
+ no warnings "experimental::lexical_subs";
+
+This enables declaration of subroutines via C<my sub foo>, C<state sub foo>
+and C<our sub foo> syntax. See L<perlsub/Lexical Subroutines> for details.
+
+This feature is available from Perl 5.18 onwards.
+
=head1 FEATURE BUNDLES
It's possible to load multiple features together, using
if ($import) {
$^H{$feature{$name}} = 1;
$^H |= $hint_uni8bit if $name eq 'unicode_strings';
+ if ($experimental{$name}) {
+ require warnings;
+ warnings::warnif("experimental::$name",
+ "The $name feature is experimental");
+ }
} else {
delete $^H{$feature{$name}};
$^H &= ~ $hint_uni8bit if $name eq 'unicode_strings';