"Save the duplicate suppression list."
(when (and gnus-save-duplicate-list
gnus-dup-list-dirty)
- (with-temp-file gnus-duplicate-file
+ (nnheader-temp-write gnus-duplicate-file
(gnus-prin1 `(setq gnus-dup-list ',gnus-dup-list))))
(setq gnus-dup-list-dirty nil))