patch 7.4.1580

Problem:    Crash when using function reference. (Luchr)
Solution:   Set initial refcount. (Ken Takata, closes #690)

src/eval.c

@@ -21705,6 +21705,7 @@ handle_subscript(
 	/* Turn "dict.Func" into a partial for "Func" with "dict". */
 	if (pt != NULL)
 	{
+	    pt->pt_refcount = 1;
 	    pt->pt_dict = selfdict;
 	    selfdict = NULL;
 	    pt->pt_name = rettv->vval.v_string;

src/testdir/test_partial.vim

@@ -68,3 +68,17 @@ func Test_partial_implicit()
 
   call assert_fails('call function(dict.MyFunc, ["bbb"], dict)', 'E924:')
 endfunc
+
+fun InnerCall(funcref)
+  return a:funcref
+endfu
+
+fun OuterCall()
+  let opt = { 'func' : function('sin') }
+  call InnerCall(opt.func)
+endfu
+
+func Test_function_in_dict()
+  call OuterCall()
+endfunc
+

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1580,
 /**/
     1579,
 /**/