python: factor out async_warn

Author: blueyed

src/_pytest/python.py

@@ -146,27 +146,30 @@ def pytest_configure(config):
     )
 
 
-@hookimpl(trylast=True)
-def pytest_pyfunc_call(pyfuncitem):
-    def async_warn():
-        msg = "async def functions are not natively supported and have been skipped.\n"
-        msg += "You need to install a suitable plugin for your async framework, for example:\n"
-        msg += "  - pytest-asyncio\n"
-        msg += "  - pytest-trio\n"
-        msg += "  - pytest-tornasync"
-        warnings.warn(PytestUnhandledCoroutineWarning(msg.format(pyfuncitem.nodeid)))
-        skip(msg="async def function and no async plugin installed (see warnings)")
+def async_warn(nodeid: str) -> None:
+    msg = "async def functions are not natively supported and have been skipped.\n"
+    msg += (
+        "You need to install a suitable plugin for your async framework, for example:\n"
+    )
+    msg += "  - pytest-asyncio\n"
+    msg += "  - pytest-trio\n"
+    msg += "  - pytest-tornasync"
+    warnings.warn(PytestUnhandledCoroutineWarning(msg.format(nodeid)))
+    skip(msg="async def function and no async plugin installed (see warnings)")
 
+
+@hookimpl(trylast=True)
+def pytest_pyfunc_call(pyfuncitem: "Function"):
     testfunction = pyfuncitem.obj
     if iscoroutinefunction(testfunction) or (
         sys.version_info >= (3, 6) and inspect.isasyncgenfunction(testfunction)
     ):
-        async_warn()
+        async_warn(pyfuncitem.nodeid)
     funcargs = pyfuncitem.funcargs
     testargs = {arg: funcargs[arg] for arg in pyfuncitem._fixtureinfo.argnames}
     result = testfunction(**testargs)
     if hasattr(result, "__await__") or hasattr(result, "__aiter__"):
-        async_warn()
+        async_warn(pyfuncitem.nodeid)
     return True