* gnus-cache.el (gnus-cache-possibly-remove-articles-1)

* gnus-cache.el (gnus-cache-possibly-remove-articles-1)
(gnus-cache-enter-article, gnus-cache-remove-article)
(gnus-cache-braid-heads, gnus-cache-generate-active): Use dolist.

* gnus-async.el (gnus-async-prefetch-remove-group): do.

* gnus-art.el (article-hide-boring-headers)
(article-translate-strings, article-display-face)
(gnus-article-mime-match-handle-first)
(gnus-article-highlight-headers)
(gnus-article-add-buttons-to-head): do.