commit https://github.com/vim/vim/commit/45d2eeaad66939348893b9254171067b0457cd9d Author: Bram Moolenaar <Bram@vim.org> Date: Mon Jun 6 21:07:52 2016 +0200 patch 7.4.1903 Problem: When writing viminfo merging current history with history in viminfo may drop recent history entries. Solution: Add new format for viminfo lines, use it for history entries. Use a timestamp for ordering the entries. Add test_settime(). Add the viminfo version. Does not do merging on timestamp yet.

--- a/src/globals.h
+++ b/src/globals.h
@@ -1639,6 +1639,10 @@ EXTERN int  in_free_unref_items INIT(= F
 EXTERN int  did_add_timer INIT(= FALSE);
 #endif
 
+#ifdef FEAT_EVAL
+EXTERN time_t time_for_testing INIT(= 0);
+#endif
+
 /*
  * Optional Farsi support.  Include it here, so EXTERN and INIT are defined.
  */