More useful error message when finding an unexpected struct.

2020-09-12 16:31:55 +10:00
parent d1821a0666
commit 067f0e835f
1 changed files with 1 additions and 1 deletions
@@ -171,7 +171,7 @@ func buildChild(k *Kong, node *Node, typ NodeType, v reflect.Value, ft reflect.S
 func buildField(k *Kong, node *Node, v reflect.Value, ft reflect.StructField, fv reflect.Value, tag *Tag, name string, seenFlags map[string]bool) {
 	mapper := k.registry.ForNamedValue(tag.Type, fv)
 	if mapper == nil {
-		fail("unsupported field type %s.%s (of type %s)", v.Type(), ft.Name, ft.Type)
+		fail("unsupported field type %s.%s (of type %s), perhaps missing a cmd:\"\" tag?", v.Type(), ft.Name, ft.Type)
 	}

 	value := &Value{