🎨 Raise exception instead of hiding it in finally (#845)

src/dependency_injector/providers.pyx

@@ -3222,7 +3222,7 @@ cdef class ThreadLocalSingleton(BaseSingleton):
                 return future_result
 
             self._storage.instance = instance
-        finally:
+        
         return instance
 
     def _async_init_instance(self, future_result, result):

tests/unit/providers/singleton/test_thread_local_singleton_py3.py

@@ -0,0 +1,20 @@
+import pytest
+
+from dependency_injector.containers import Container
+from dependency_injector.providers import ThreadLocalSingleton
+
+
+class FailingClass:
+    def __init__(self):
+        raise ValueError("FAILING CLASS")
+
+
+class TestContainer(Container):
+    failing_class = ThreadLocalSingleton(FailingClass)
+
+
+def test_on_failure_value_error_is_raised():
+    container = TestContainer()
+
+    with pytest.raises(ValueError, match="FAILING CLASS"):
+        container.failing_class()