diff options
| -rw-r--r-- | doc/lispref/sequences.texi | 8 | ||||
| -rw-r--r-- | etc/NEWS | 3 |
2 files changed, 7 insertions, 4 deletions
diff --git a/doc/lispref/sequences.texi b/doc/lispref/sequences.texi index 53d37199bf7..4a48d62f6db 100644 --- a/doc/lispref/sequences.texi +++ b/doc/lispref/sequences.texi @@ -957,9 +957,11 @@ contain less elements than @var{n}. @var{n} must be an integer. If @cindex sequences, union of @cindex union of sequences This function returns a list of the elements that appear either in -@var{sequence1} or @var{sequence2}. If the optional argument -@var{function} is non-@code{nil}, it is a function of two arguments to -use to compare elements instead of the default @code{equal}. +@var{sequence1} or @var{sequence2}. The elements of the returned list +are all unique, in the sense that no two elements there will compare +equal. If the optional argument @var{function} is non-@code{nil}, it +should be a function of two arguments to use to compare elements, +instead of the default @code{equal}. @example @group @@ -3858,7 +3858,8 @@ supporting Lisp files when 'require' is unsuitable. +++ ** New function 'seq-union'. This function takes two sequences and returns a list of all elements -that appear in either of them. +that appear in either of them, with no two elements that compare equal +appearing in the result. +++ ** New function 'syntax-class-to-char'. |