commit 890dd05492d88d48eee1dda7f7a1811d027ce7ca
author Bram Moolenaar <Bram@vim.org> Sat Dec 16 19:59:37 2017 +0100
committer Bram Moolenaar <Bram@vim.org> Sat Dec 16 19:59:37 2017 +0100
tree 94ff6a4e197a1c1947b5a311f92c2ce88c7c3dab
parent a1d5c154dbd5fbe317726bbf2ba99632b91878f4

patch 8.0.1397: pattern with \& following nothing gives an error

Problem:    Pattern with \& following nothing gives an error.
Solution:   Emit an empty node when needed.

src/testdir/test_search.vim

diff --git a/src/testdir/test_search.vim b/src/testdir/test_search.vim
index d13e654..cb65fbf 100644
--- a/src/testdir/test_search.vim
+++ b/src/testdir/test_search.vim
@@ -721,3 +721,11 @@
   enew!
   let &encoding = save_enc
 endfunc
+
+" This was causing E874.  Also causes an invalid read?
+func Test_look_behind()
+  new
+  call setline(1, '0\|\&\n\@<=') 
+  call search(getline("."))
+  bwipe!
+endfunc