1 files changed, 9 insertions, 1 deletions
diff --git a/test/functional/lua/ffi_spec.lua b/test/functional/lua/ffi_spec.lua
index 18b13a8959..3a37b18cd1 100644
--- a/test/functional/lua/ffi_spec.lua
+++ b/test/functional/lua/ffi_spec.lua
@@ -25,7 +25,6 @@ describe('ffi.cdef', function()
       local ffi = require('ffi')
 
       ffi.cdef[[
-        typedef unsigned char char_u;
         typedef struct window_S win_T;
         typedef struct {} stl_hlrec_t;
         typedef struct {} StlClickRecord;
@@ -63,5 +62,14 @@ describe('ffi.cdef', function()
         nil
       )
     ]=])
+
+    -- Check that extern symbols are exported and accessible
+    eq(true, exec_lua[[
+      local ffi = require('ffi')
+
+      ffi.cdef('uint64_t display_tick;')
+
+      return ffi.C.display_tick >= 0
+    ]])
   end)
 end)