diff options
Diffstat (limited to 'Lib/asyncio/coroutines.py')
| -rw-r--r-- | Lib/asyncio/coroutines.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/Lib/asyncio/coroutines.py b/Lib/asyncio/coroutines.py index e11b21b0975..3a92c7d7552 100644 --- a/Lib/asyncio/coroutines.py +++ b/Lib/asyncio/coroutines.py @@ -140,7 +140,13 @@ class CoroWrapper: if compat.PY35: - __await__ = __iter__ # make compatible with 'await' expression + def __await__(self): + cr_await = getattr(self.gen, 'cr_await', None) + if cr_await is not None: + raise RuntimeError( + "Cannot await on coroutine {!r} while it's " + "awaiting for {!r}".format(self.gen, cr_await)) + return self @property def gi_yieldfrom(self): |