Updated an example to refer to BaseExceptionGroup

docs/source/tutorial/echo-server.py

@@ -11,6 +11,7 @@
 
 CONNECTION_COUNTER = count()
 
+
 async def echo_server(server_stream):
     # Assign each connection a unique number to make our debug prints easier
     # to understand when there are multiple simultaneous connections.
@@ -21,18 +22,20 @@ async def echo_server(server_stream):
             print(f"echo_server {ident}: received data {data!r}")
             await server_stream.send_all(data)
         print(f"echo_server {ident}: connection closed")
-    # FIXME: add discussion of MultiErrors to the tutorial, and use
-    # MultiError.catch here. (Not important in this case, but important if the
-    # server code uses nurseries internally.)
+    # FIXME: add discussion of (Base)ExceptionGroup to the tutorial, and use
+    # exceptiongroup.catch() here. (Not important in this case, but important
+    # if the server code uses nurseries internally.)
     except Exception as exc:
         # Unhandled exceptions will propagate into our parent and take
         # down the whole program. If the exception is KeyboardInterrupt,
         # that's what we want, but otherwise maybe not...
         print(f"echo_server {ident}: crashed: {exc!r}")
 
+
 async def main():
     await trio.serve_tcp(echo_server, PORT)
 
+
 # We could also just write 'trio.run(trio.serve_tcp, echo_server, PORT)', but real
 # programs almost always end up doing other stuff too and then we'd have to go
 # back and factor it out into a separate function anyway. So it's simplest to