commit d39a7512804f860a20319c181613771a79a9ea4e
author Bram Moolenaar <Bram@vim.org> Thu Apr 16 22:51:22 2015 +0200
committer Bram Moolenaar <Bram@vim.org> Thu Apr 16 22:51:22 2015 +0200
tree 21a9a78e28c54b0f7865ec195ea4eb9bd91f1cc6
parent ec45c4a6dfd8acf52c8d1412188f54f79dde895e

patch 7.4.702
Problem:    Joining an empty list does uneccessary work.
Solution:   Let join() return early. (Marco Hinz)

src/eval.c

diff --git a/src/eval.c b/src/eval.c
index f9df763..b80762e 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -6780,6 +6780,8 @@
     join_T	*p;
     int		i;
 
+    if (l->lv_len < 1)
+	return OK; /* nothing to do */
     ga_init2(&join_ga, (int)sizeof(join_T), l->lv_len);
     retval = list_join_inner(gap, l, sep, echo_style, copyID, &join_ga);
 

src/version.c

diff --git a/src/version.c b/src/version.c
index 3f913ca..0f02ea8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    702,
+/**/
     701,
 /**/
     700,