ChuanqiXu added a comment.

> however, if there are important unresolved issues, why did we set 
> __cpp_impl_coroutine ?

The discussion is here: 
https://discourse.llvm.org/t/rfc-could-we-mark-coroutines-as-unreleased-now/69220.
 My short summary may be:
(1) It is not necessary to claim a feature is completed only after there is no 
related open issues. For example, GCC claims coroutines (and many other 
features) as completed in the early stage and there are still many following 
bug reports then. 
(2) Coroutines are used widely and deeply around the C++ world. People from 
Meta (Meta should be, at least, one of the most heavy user of coroutines in the 
past years) said they would love to approve to the idea even if it is not bug 
free.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D156247/new/

https://reviews.llvm.org/D156247

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