Removed a redundant 'once'
pp_hot.c:pp_entersub: Rmv comment about setting PL_compcv

PL_compcv is meant to point to the currently compiling sub, even dur-
ing an eval’s run time.  (See commit 676a678.)  Therefore, this com-
ment’s suggestion is incorrect.
regen/opcodes: Rmv evalonce comment

This goes all the way back to when perl 5.0 was being polished up.
The idea behind evalonce is that eval "constant string" should be
optimisable by being compiled ahead of time, just like eval { ... }.
But this could never work properly, because BEGIN blocks would only
fire once.  Also, eval '$x .. $y' is an easy way to create two separ-
ate flip-flops.  There are undoubtedly many other reasons why this
could never work.

So there is no reason to keep this comment any longer, as it is not
(or should not be) a to-do item.
Corrections to AUTHORS should go to perlbug
Increase $B::Concise::VERSION to 0.90
Teach B::Concise about UTF8 labels
[perl #111794] Make goto "" like goto ${\""}

The logic was written in such a way that goto "" just happened to slip
past all the checks and cause pp_goto to return NULL for the next op,
which means the end of the program.

goto ${\""} dies with ‘goto must have label’, so goto ""
should as well.

This also adds other tests for that error, which was apparently
untested till now.
Produce the right error for goto "\0"

Since we have supported for embedded nulls in strings, we shouldn’t
be using if(*label) to see whether label has a non-zero length.

It’s probably not possible to get a null into a label, but we should
still say ‘can’t find’ rather than ‘must have’ in that case.
pp_ctl.c:pp_goto: Don’t repeat yourself

No need to say DIE three times.
Increase $XS::APItest::VERSION to 0.39
XS-APItest/t/hash.t: comment typo
mg.c:magic_clearhint: remove redundant PERL_UNUSED_ARG
[perl #111000] Let hv_store work on hint hashes

Magic attached to hash elements has its key stored differently depend-
ing on how it was supplied to hv_common.  hv_store passes a string/
length pair to hv_common, while hv_store_ent passes an SV.

magic_clearhint wasn’t able to handle string/length pairs, and only
worked with SVs, resulting in assertion failures or crashes.

This commit fixes magic_clearhint, so that XS code can use hv_store on
hint hashes.
Copy call checker when cloning closure prototype

Otherwise cv_set_call_checker has no effect inside an attribute han-
dler for a closure.
perldata: Consistent spaces after dots
[perl #112184] Handle $^N in Perl_magic_set

$^N is a magical variable, like $1 and $2, with the usual ‘sv’
magic.  So it is handled by Perl_magic_get and Perl_magic_set.  But
Perl_magic_set didn’t have a case for it, so it simply ignored it and
did nothing, like a tied variable with an empty STORE method.

Now assigning to $^N has the same affect as assigned to the numbered
variable to which it corresponds.  If there is no corresponding cap-
ture from the last match, or in the absence of regexp plugins, it
croaks with ‘Modification of a read-only value’.
Remove todo for UTF8 source filters

Source filters don’t really make sense on character streams.  They are
designed for streams of bytes coming straight from a file.  Things
stop making sense if you have ‘use utf8’ in a UTF-8 scalar (does that
mean double-decode?).

It’s for this reason that evalbytes respects source filters, while
eval does not.  (It doesn’t outside the unicode_eval feature, because
it was never really thought about and the implementation didn’t take
it into account, resulting in strange behaviour.  It doesn’t with the
unicode_eval feature, because it was intentionally prohibited.)
Increase $Storable::VERSION to 2.35
[perl #112358] Storable: Don’t create RV with no refcnt

Otherwise assigning to it will cause the referent to be freed, because
nothing but Storable knows that it has no reference count.

Storable.xs was creating a new RV without increasing the refe-
rence count on the referent.  It was then using it to call the
STORABLE_freeze method on the object.  Since Perl passes arguments
by reference, it was possible to unref the reference by assigning to
$_[0] within STORABLE_freeze.  That would cause the object’s reference
count to go down.
Increase $File::Find::VERSION to 1.21