From f9e34dc2ecd3a8d79a4861b20d596cd1c3a7ac26 Mon Sep 17 00:00:00 2001
From: brentyi <yibrenth@gmail.com>
Date: Fri, 11 Oct 2024 00:18:43 -0700
Subject: [PATCH] Appease mypy

---
 src/tyro/_fields.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/tyro/_fields.py b/src/tyro/_fields.py
index 8bfb2f30..ec4127f6 100644
--- a/src/tyro/_fields.py
+++ b/src/tyro/_fields.py
@@ -44,6 +44,7 @@
     is_typeddict,
 )
 
+from . import conf  # Avoid circular import.
 from . import (
     _docstrings,
     _instantiators,
@@ -51,7 +52,6 @@
     _singleton,
     _strings,
     _unsafe_cache,
-    conf,  # Avoid circular import.
 )
 from ._typing import TypeForm
 from .conf import _confstruct, _markers
@@ -960,9 +960,10 @@ def _try_field_list_from_general_callable(
         params = params[1:]
 
     # If a default is provided: either all or none of the arguments must be passed in.
-    markers = ()
     if default_instance not in MISSING_SINGLETONS:
         markers = (_markers._OPTIONAL_GROUP,)
+    else:
+        markers = ()
 
     with FieldDefinition.marker_context(markers):
         return _field_list_from_params(f, cls, params)