gnus-merge

gnus-merge is an alias for `cl-merge' in `gnus-util.el'.

(gnus-merge TYPE SEQ1 SEQ2 PREDICATE [KEYWORD VALUE]...)

Destructively merge the two sequences to produce a new sequence.
TYPE is the sequence type to return, SEQ1 and SEQ2 are the two argument
sequences, and PREDICATE is a `less-than' predicate on the elements.

Keywords supported: :key