Gnus and Emacs master, "wrong type argument" error

[Lele Gaifax]

Hi all,

as my usual habit, now and then I recompile the master version of Emacs, and
so I did this morning. 

Everything seemed ok until I tried to read some news with Gnus: whenever I try
to enter into any of the groups I'm subscribed, I get the following error
(refilled)

  gnus-request-group: Wrong type argument: vectorp, #s(hash-table size 39 test
  equal rehash-size 1.5 rehash-threshold 0.8125 data ("dummy.group" (nil
  ("dummy.group" 0 nil)) "nndraft:drafts" (1 ("nndraft:drafts" 1 nil nil
  (nndraft "") ((gnus-dummy (gnus-draft-mode))))) "gmane.comp.python.general"
  (19 ("gmane.comp.python.general" 3 ((1 . 827724) 827727 827729) ((unexist)
  ....

I saw Eric Abrahamsen's commits related to changing some internal storage from
obarrays to hash tables, and I guess my problem is due to that: I switched
back to commit bc2a93d5b7c3d749b31927452e31b32bdb1b9108 and everything works
again.

I did not find any mention about required "migrations" of existing .newsrc.eld
in the NEWS, nor in the commits.

Am I missing something or are those changes still in flux?

Thank you for any hint,
ciao, lele.
-- 
nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
lele@metapensiero.it  |                 -- Fortunato Depero, 1929.