gh-89687: fix get_type_hints with dataclasses __init__ generation by Tishka17 · Pull Request #137168 · python/cpython

diff --git a/Lib/dataclasses.py b/Lib/dataclasses.py
index 53b3b54cfb3..e3d25fb0840 100644
--- a/Lib/dataclasses.py
+++ b/Lib/dataclasses.py
@@ -789,7 +789,10 @@ def _get_field(cls, a_name, a_type, default_kw_only):
 
     # Only at this point do we know the name and the type.  Set them.
     f.name = a_name
-    f.type = a_type
+    if isinstance(a_type, str):
+        f.type = annotationlib.ForwardRef(a_type, owner=cls)
+    else:
+        f.type = a_type
 
     # Assume it's a normal field until proven otherwise.  We're next
     # going to decide if it's a ClassVar or InitVar, everything else