patch 9.1.0909: Vim9: crash when calling instance method

Problem:  Vim9: crash when calling instance method
          (Igbanam Ogbuluijah)
Solution: Pass the object when calling a partial function
          (Yegappan Lakshmanan)

fixes: #16166
closes: #16180

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/eval.c

@@ -271,8 +271,10 @@ eval_expr_partial(
 	    return FAIL;
 
 	// Shortcut to call a compiled function with minimal overhead.
+	if (partial->pt_obj != NULL)
+	    partial->pt_obj->obj_refcount++;
 	r = call_def_function(partial->pt_func, argc, argv, DEF_USE_PT_ARGV,
-						partial, NULL, fc, rettv);
+					partial, partial->pt_obj, fc, rettv);
 	if (fc_arg == NULL)
 	    remove_funccal();
 	if (r == FAIL)

src/testdir/test_vim9_class.vim

@@ -11596,4 +11596,65 @@ def Test_any_obj_var_type()
   v9.CheckScriptFailure(lines, 'E1012: Type mismatch; expected list<any> but got string', 1)
 enddef
 
+" Test for using an object method with mapnew()
+def Test_mapnew_with_instance_method()
+  var lines =<< trim END
+    vim9script
+
+    class Foo
+      var str: string
+      var nums: list<number> = [1, 2, 3]
+
+      def InstanceMethod(n: number): string
+        return this.str .. n
+      enddef
+
+      def MapperMethod(idx: number, elem: number): string
+        return elem->this.InstanceMethod()
+      enddef
+
+      def MapTest()
+        this.str = "foo"
+        var l = ['foo1', 'foo2', 'foo3']
+        assert_equal(l, this.nums->mapnew(this.MapperMethod))
+      enddef
+    endclass
+
+    Foo.new().MapTest()
+  END
+  v9.CheckSourceSuccess(lines)
+
+  # Error in the mapnew() function
+  lines =<< trim END
+    vim9script
+
+    class Foo
+      var str: string
+      var nums: list<number> = [1, 2, 3]
+
+      def InstanceMethod(n: number): string
+        throw "InstanceMethod failed"
+      enddef
+
+      def MapperMethod(idx: number, elem: number): string
+        return elem->this.InstanceMethod()
+      enddef
+
+      def MapTest()
+        this.str = "foo"
+        var caught_exception: bool = false
+        try
+          this.nums->mapnew(this.MapperMethod)
+        catch /InstanceMethod failed/
+          caught_exception = true
+        endtry
+        assert_true(caught_exception)
+      enddef
+    endclass
+
+    Foo.new().MapTest()
+  END
+  v9.CheckSourceSuccess(lines)
+enddef
+
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    909,
 /**/
     908,
 /**/