patch 9.0.2016: Vim9: assignment operators don't work for class vars

Problem:  Vim9: assignment operators don't work for class vars
Solution: implement it

closes: #13306

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 7e1914b..544ad17 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -1770,7 +1770,7 @@
 		lhs->lhs_dest = dest_class_member;
 		lhs->lhs_class = cctx->ctx_ufunc->uf_class;
 		lhs->lhs_type =
-		    class_member_type_by_idx(cctx->ctx_ufunc->uf_class,
+		    oc_member_type_by_idx(cctx->ctx_ufunc->uf_class,
 					FALSE, lhs->lhs_classmember_idx);
 	    }
 	    else
@@ -2254,7 +2254,7 @@
 	   return FAIL;
 
 	class_T	*cl = lhs->lhs_type->tt_class;
-	type_T	*type = class_member_type(cl, TRUE, dot + 1,
+	type_T	*type = oc_member_type(cl, TRUE, dot + 1,
 					  lhs->lhs_end, &lhs->lhs_member_idx);
 	if (lhs->lhs_member_idx < 0)
 	    return FAIL;
@@ -2275,6 +2275,22 @@
 	    return generate_GET_ITF_MEMBER(cctx, cl, lhs->lhs_member_idx, type);
 	return generate_GET_OBJ_MEMBER(cctx, lhs->lhs_member_idx, type);
     }
+    else if (lhs->lhs_type->tt_type == VAR_CLASS)
+    {
+	// "<classname>.value": load class variable "classname.value"
+       char_u *dot = vim_strchr(var_start, '.');
+       if (dot == NULL)
+	   return FAIL;
+
+	class_T	*cl = lhs->lhs_type->tt_class;
+	ocmember_T *m = class_member_lookup(cl, dot + 1,
+						lhs->lhs_end - dot - 1,
+						&lhs->lhs_member_idx);
+	if (m == NULL)
+	    return FAIL;
+
+	return generate_CLASSMEMBER(cctx, TRUE, cl, lhs->lhs_member_idx);
+    }
 
     compile_load_lhs(lhs, var_start, NULL, cctx);