patch 8.2.3269: Vim9: wrong argument check for partial

Problem:    Vim9: wrong argument check for partial. (Naohiro Ono)
Solution:   Handle getting return type without arguments. Correct the minimal
            number of arguments for what is included in the partial.
            (closes #8667)

src/evalfunc.c

@@ -932,22 +932,27 @@ ret_first_arg(int argcount, type_T **argtypes)
     return &t_void;
 }
     static type_T *
-ret_repeat(int argcount UNUSED, type_T **argtypes)
+ret_repeat(int argcount, type_T **argtypes)
 {
+    if (argcount == 0)
+	return &t_any;
     if (argtypes[0] == &t_number)
 	return &t_string;
     return argtypes[0];
 }
 // for map(): returns first argument but item type may differ
     static type_T *
-ret_first_cont(int argcount UNUSED, type_T **argtypes)
+ret_first_cont(int argcount, type_T **argtypes)
 {
-    if (argtypes[0]->tt_type == VAR_LIST)
-	return &t_list_any;
-    if (argtypes[0]->tt_type == VAR_DICT)
-	return &t_dict_any;
-    if (argtypes[0]->tt_type == VAR_BLOB)
-	return argtypes[0];
+    if (argcount > 0)
+    {
+	if (argtypes[0]->tt_type == VAR_LIST)
+	    return &t_list_any;
+	if (argtypes[0]->tt_type == VAR_DICT)
+	    return &t_dict_any;
+	if (argtypes[0]->tt_type == VAR_BLOB)
+	    return argtypes[0];
+    }
     return &t_any;
 }
 
@@ -987,9 +992,9 @@ ret_argv(int argcount, type_T **argtypes UNUSED)
 }
 
     static type_T *
-ret_remove(int argcount UNUSED, type_T **argtypes)
+ret_remove(int argcount, type_T **argtypes)
 {
-    if (argtypes != NULL)
+    if (argcount > 0)
     {
 	if (argtypes[0]->tt_type == VAR_LIST
 		|| argtypes[0]->tt_type == VAR_DICT)
@@ -2446,6 +2451,7 @@ internal_func_get_argcount(int idx, int *argcount, int *min_argcount)
  * Call the "f_retfunc" function to obtain the return type of function "idx".
  * "argtypes" is the list of argument types or NULL when there are no
  * arguments.
+ * "argcount" may be less than the actual count when only getting the type.
  */
     type_T *
 internal_func_ret_type(int idx, int argcount, type_T **argtypes)

src/testdir/test_vim9_func.vim

@@ -2582,24 +2582,31 @@ def Test_invalid_function_name()
 enddef
 
 def Test_partial_call()
-  var Xsetlist = function('setloclist', [0])
-  Xsetlist([], ' ', {title: 'test'})
-  getloclist(0, {title: 1})->assert_equal({title: 'test'})
+  var lines =<< trim END
+      var Xsetlist: func
+      Xsetlist = function('setloclist', [0])
+      Xsetlist([], ' ', {title: 'test'})
+      getloclist(0, {title: 1})->assert_equal({title: 'test'})
 
-  Xsetlist = function('setloclist', [0, [], ' '])
-  Xsetlist({title: 'test'})
-  getloclist(0, {title: 1})->assert_equal({title: 'test'})
+      Xsetlist = function('setloclist', [0, [], ' '])
+      Xsetlist({title: 'test'})
+      getloclist(0, {title: 1})->assert_equal({title: 'test'})
 
-  Xsetlist = function('setqflist')
-  Xsetlist([], ' ', {title: 'test'})
-  getqflist({title: 1})->assert_equal({title: 'test'})
+      Xsetlist = function('setqflist')
+      Xsetlist([], ' ', {title: 'test'})
+      getqflist({title: 1})->assert_equal({title: 'test'})
 
-  Xsetlist = function('setqflist', [[], ' '])
-  Xsetlist({title: 'test'})
-  getqflist({title: 1})->assert_equal({title: 'test'})
+      Xsetlist = function('setqflist', [[], ' '])
+      Xsetlist({title: 'test'})
+      getqflist({title: 1})->assert_equal({title: 'test'})
 
-  var Len: func: number = function('len', ['word'])
-  assert_equal(4, Len())
+      var Len: func: number = function('len', ['word'])
+      assert_equal(4, Len())
+
+      var RepeatFunc = function('repeat', ['o'])
+      assert_equal('ooooo', RepeatFunc(5))
+  END
+  CheckDefAndScriptSuccess(lines)
 enddef
 
 def Test_cmd_modifier()

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3269,
 /**/
     3268,
 /**/

src/vim9type.c

@@ -378,6 +378,11 @@ typval2type_int(typval_T *tv, int copyID, garray_T *type_gap, int do_member)
     type->tt_type = tv->v_type;
     type->tt_argcount = argcount;
     type->tt_min_argcount = min_argcount;
+    if (tv->v_type == VAR_PARTIAL && tv->vval.v_partial->pt_argc > 0)
+    {
+	type->tt_argcount -= tv->vval.v_partial->pt_argc;
+	type->tt_min_argcount -= tv->vval.v_partial->pt_argc;
+    }
     type->tt_member = member_type;
 
     return type;