At the language-level support for Micro-thread?

[via Digitalmars-d]

On Wednesday, 24 September 2014 at 11:55:46 UTC, Jet wrote:
> On Tuesday, 23 September 2014 at 08:06:36 UTC, Idan Arye wrote:
>> On Tuesday, 23 September 2014 at 03:07:41 UTC, Jet wrote:
>>> I hope the Dlang can have the Micro-thread at the 
>>> language-level. Like the Goroutine, maby.
>>
>> Sure it can - it's called "Fibers":
>>
>> http://dlang.org/phobos/core_thread.html#.Fiber
>
> Oh, language-level ?

What's wrong with a library implementation?