Fix an issue with api_name of class attributes, fixes #1688

test/completion/arrays.py

@@ -214,6 +214,20 @@ f
 #? str()
 g
 
+# -----------------
+# setitem
+# -----------------
+
+class F:
+    setitem_x = [1,2]
+    setitem_x[0] = 3
+
+#? ['setitem_x']
+F().setitem_x
+#? list()
+F().setitem_x
+
+
 # -----------------
 # dicts
 # -----------------