Revert "[tasks] Add Loop.exception for more reliable exception retrieval."

This reverts commit 7a8c9e66d9.

discord/ext/tasks/__init__.py

@@ -40,7 +40,6 @@ class Loop:
         self._is_being_cancelled = False
         self._has_failed = False
         self._stop_next_iteration = False
-        self._exception = None
 
         if self.count is not None and self.count <= 0:
             raise ValueError('count must be greater than 0 or None.')
@@ -82,9 +81,8 @@ class Loop:
         except asyncio.CancelledError:
             self._is_being_cancelled = True
             raise
-        except Exception as e:
+        except Exception:
             self._has_failed = True
-            self._exception = e
             log.exception('Internal background task failed.')
             raise
         finally:
@@ -93,7 +91,6 @@ class Loop:
             self._current_loop = 0
             self._stop_next_iteration = False
             self._has_failed = False
-            self._exception = None
 
     def __get__(self, obj, objtype):
         if obj is None:
@@ -259,16 +256,6 @@ class Loop:
         """
         return self._has_failed
 
-    def exception(self):
-        """Optional[:class:`Exception`]: The exception that the internal task failed with.
-
-        .. versionadded:: 1.3.0
-        """
-        if self._exception is not None:
-            return self._exception
-        if self._task is not None:
-            return self._task.exception()
-
     def before_loop(self, coro):
         """A decorator that registers a coroutine to be called before the loop starts running.