Remove support for setting $[ to a non-zero value

This removes arybase and all its surrounding machinery.

4 files changed, 15 insertions, 33 deletions

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 36178a1c6d..221d0df2f3 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -45,6 +45,12 @@ XXX For a release on a stable branch, this section aspires to be:
 
 [ List each incompatible change as a =head2 entry ]
 
+=head2 Assigning non-zero to C<$[> is fatal
+
+Setting L<< C<$[>|perlvar/$[ >> to a non-zero value has been deprecated since
+Perl 5.12 and now throws a fatal error.
+See L<<< perldeprecation/Assigning non-zero to C<< $[ >> is fatal >>>.
+
 =head1 Deprecations
 
 XXX Any deprecated features, syntax, modules etc. should be listed here.
diff --git a/pod/perldeprecation.pod b/pod/perldeprecation.pod
index 938d67832d..f3b530881e 100644
--- a/pod/perldeprecation.pod
+++ b/pod/perldeprecation.pod
@@ -136,14 +136,14 @@ error in Perl 5.30.
 To specify how numbers are formatted when printed, one is advised
 to use C<< printf >> or C<< sprintf >> instead.
 
-=head3 Assigning non-zero to C<< $[ >> will be fatal
+=head3 Assigning non-zero to C<< $[ >> is fatal
 
 This variable (and the corresponding C<array_base> feature and
-L<arybase> module) allows changing the base for array and string
+L<arybase> module) allowed changing the base for array and string
 indexing operations.
 
 Setting this to a non-zero value has been deprecated since Perl 5.12 and
-will become fatal in Perl 5.30.
+throws a fatal error as of Perl 5.30.
 
 =head3 C<< File::Glob::glob() >> will disappear
 
diff --git a/pod/perldiag.pod b/pod/perldiag.pod
index 2c1fe74a87..17b96caad1 100644
--- a/pod/perldiag.pod
+++ b/pod/perldiag.pod
@@ -264,7 +264,8 @@ an array, or an array to a hash; the two types must match.
 
 =item Assigning non-zero to $[ is no longer possible
 
-(F) When the "array_base" feature is disabled (e.g., under C<use v5.16;>)
+(F) When the "array_base" feature is disabled
+(e.g., and under C<use v5.16;>, and as of Perl 5.30)
 the special variable C<$[>, which is deprecated, is now a fixed zero value.
 
 =item Assignment to both a list and a scalar
@@ -6109,21 +6110,6 @@ a dirhandle.  Check your control flow.
 (W unopened) You tried to use the tell() function on a filehandle that
 was either never opened or has since been closed.
 
-=item That use of $[ is unsupported
-
-(F) Assignment to C<$[> is now strictly circumscribed, and interpreted
-as a compiler directive.  You may say only one of
-
-    $[ = 0;
-    $[ = 1;
-    ...
-    local $[ = 0;
-    local $[ = 1;
-    ...
-
-This is to prevent the problem of one module changing the array base out
-from under another module inadvertently.  See L<perlvar/$[> and L<arybase>.
-
 =item The alpha_assertions feature is experimental
 
 (S experimental::alpha_assertions) This feature is experimental
@@ -7188,13 +7174,6 @@ you can write it as C<push(@tied_array,())> to avoid this warning.
 (F) The "use" keyword is recognized and executed at compile time, and
 returns no useful value.  See L<perlmod>.
 
-=item Use of assignment to $[ is deprecated, and will be fatal in 5.30
-
-(D deprecated) The C<$[> variable (index of the first element in an array)
-is deprecated since Perl 5.12, and setting it to a non-zero value will be
-fatal as of Perl 5.30.
-See L<perlvar/"$[">.
-
 =item Use of bare << to mean <<"" is forbidden
 
 (F) You are now required to use the explicitly quoted form if you wish
diff --git a/pod/perlvar.pod b/pod/perlvar.pod
index 114a7e0d12..5faea28062 100644
--- a/pod/perlvar.pod
+++ b/pod/perlvar.pod
@@ -2371,19 +2371,16 @@ scopes in the same file, unlike other compile-time directives (such as
 L<strict>).  Using local() on it would bind its value strictly to a lexical
 block.  Now it is always lexically scoped.
 
-As of Perl v5.16.0, it is implemented by the L<arybase> module.  See
-L<arybase> for more details on its behaviour.
+As of Perl v5.16.0, it is implemented by the L<arybase> module.
 
-Under C<use v5.16>, or C<no feature "array_base">, C<$[> no longer has any
-effect, and always contains 0.  Assigning 0 to it is permitted, but any
-other value will produce an error.
+As of Perl v5.30.0, or under C<use v5.16>, or C<no feature "array_base">,
+C<$[> no longer has any effect, and always contains 0.
+Assigning 0 to it is permitted, but any other value will produce an error.
 
 Mnemonic: [ begins subscripts.
 
 Deprecated in Perl v5.12.0.
 
-Assigning a non-zero value be fatal in Perl v5.30.0.
-
 =back
 
 =cut