patch 7.4.1656

Problem:    Crash when using partial with a timer.
Solution:   Increment partial reference count. (Hirohito Higashi)

src/eval.c

@@ -20190,6 +20190,7 @@ get_callback(typval_T *arg, partial_T **pp)
     if (arg->v_type == VAR_PARTIAL && arg->vval.v_partial != NULL)
     {
 	*pp = arg->vval.v_partial;
+	++(*pp)->pt_refcount;
 	return (*pp)->pt_name;
     }
     *pp = NULL;

src/testdir/test_timers.vim

@@ -30,3 +30,16 @@ func Test_repeat_many()
   call assert_true(s:val > 1)
   call assert_true(s:val < 5)
 endfunc
+
+func Test_with_partial_callback()
+  let s:val = 0
+  let s:meow = {}
+  function s:meow.bite(...)
+    let s:val += 1
+  endfunction
+
+  call timer_start(50, s:meow.bite)
+  sleep 200m
+  call assert_equal(1, s:val)
+endfunc
+" vim: ts=2 sw=0 et

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1656,
 /**/
     1655,
 /**/