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[commands] Error out when someone passes plain Cog.listener decorator.

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Should make this error easier to catch rather than silent failure.
This commit is contained in:
Rapptz 2019-02-27 21:33:52 -05:00
parent 8beabcc39a
commit 21a296d538
1 changed files with 5 additions and 1 deletions
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6
discord/ext/commands/cog.py
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@ -203,9 +203,13 @@ class Cog(metaclass=CogMeta):
Raises
--------
TypeError
The function is not a coroutine function.
The function is not a coroutine function or a string was not passed as
the name.
"""
if name is not None and not isinstance(name, str):
raise TypeError('Cog.listener expected str but received {0.__class__.__name__!r} instead.'.format(name))
def decorator(func):
if not inspect.iscoroutinefunction(func):
raise TypeError('Listener function must be a coroutine function.')