patch 8.2.2659: eval test fails because for loop on string works

Problem:    Eval test fails because for loop on string works.
Solution:   Check looping over function reference fails.

Author: brammool

src/testdir/test_eval_stuff.vim

@@ -66,7 +66,7 @@ endfunc
 
 func Test_for_invalid()
   call assert_fails("for x in 99", 'E714:')
-  call assert_fails("for x in 'asdf'", 'E714:')
+  call assert_fails("for x in function('winnr')", 'E714:')
   call assert_fails("for x in {'a': 9}", 'E714:')
 
   if 0

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2659,
 /**/
     2658,
 /**/