✨ Feature: 依赖注入支持 Generic TypeVar 和 Matcher 重载 (#2089)

tests/plugins/param/param_bot.py

@@ -1,4 +1,4 @@
-from typing import Union
+from typing import Union, TypeVar
 
 from nonebot.adapters import Bot
 
@@ -31,5 +31,19 @@ async def union_bot(b: Union[FooBot, BarBot]) -> Union[FooBot, BarBot]:
     return b
 
 
+B = TypeVar("B", bound=Bot)
+
+
+async def generic_bot(b: B) -> B:
+    return b
+
+
+CB = TypeVar("CB", Bot, None)
+
+
+async def generic_bot_none(b: CB) -> CB:
+    return b
+
+
 async def not_bot(b: Union[int, Bot]):
     ...