commit 1d90a5a5af84250e226f8a9121e771f7b72aa894
author Bram Moolenaar <Bram@vim.org> Fri Jul 01 11:59:47 2016 +0200
committer Bram Moolenaar <Bram@vim.org> Fri Jul 01 11:59:47 2016 +0200
tree a389742a425e6f06966959bd744c96c3a4f296a3
parent 6747fabc7348bf5f41ccfe851e2be3e900ec8ee0

patch 7.4.1968
Problem:    Invalid memory access with "\<C-">.
Solution:   Do not recognize this as a special character. (Dominique Pelle)

src/testdir/test_expr.vim

diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index 7d7870e..f44e216 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -101,3 +101,8 @@
 func Test_set_reg_null_list()
   call setreg('x', test_null_list())
 endfunc
+
+func Test_special_char()
+  " The failure is only visible using valgrind.
+  call assert_fails('echo "\<C-">')
+endfunc