The following code:

async def foo():
    lst = [await coro(i) for i in range(10)]
    return lst

gives

SyntaxError: 'await' outside async function

I understand that this is because the comprehensions are implemented using a function scope (see also #10544), but such behavior is unintuitive.

IMO there are two possibilities here:
1) make comprehensions behave more like a for loop;
2) change the exception text to something like "SyntaxError: 'await's in comprehensions are not supported".

I understand that the first option is probably not for 3.5 (it is beta already), but I will be happy if the second option will be implemented in 3.5

Thanks for discovering this, Ivan.  The patch is attached.

New changeset 30b676e8b21f by Yury Selivanov in branch '3.5':
Issue #24528: Improve error message for awaits in comprehensions
https://hg.python.org/cpython/rev/30b676e8b21f

New changeset 9598bc916186 by Yury Selivanov in branch 'default':
Merge 3.5 (Issue #24528)
https://hg.python.org/cpython/rev/9598bc916186

Yury, thank you for the patch, the error message is much clearer now.