Regarding the parsing of await expression.

[Shiyao Ma]

Hi,

In the pep, https://www.python.org/dev/peps/pep-0492/#examples-of-await-expressions 

It is said,

await await coro()  is SyntaxError, instead, we should use await (await coro())
Why? because of await is not left-associative?


also, for 
await -coro() , it should be written as,  await (-coro())

I don't understand the point here.  Why can't the parser figure out it indeed is await (-coro()) ?


Is it due to the fact Python uses LL(1) or just because of current impl doesn't do that?

Regards.