run.dlang.io dmd version < 2.086 fail

[Petar]

On Sunday, 17 November 2019 at 18:15:02 UTC, GoaLitiuM wrote:
> On Sunday, 17 November 2019 at 15:55:58 UTC, James Blachly 
> wrote:
>> On 11/17/19 10:53 AM, Eugene Wissner wrote:
>>> On Sunday, 17 November 2019 at 15:48:09 UTC, James Blachly 
>>> wrote:
>>> What code are you trying to run? `std` is a fresh addition. 
>>> it wasn't available in the older versions.
>>
>> The default "Hello D" provided by the playground. A quick swap 
>> for std.stdio fixes -- thanks for pointing this out.
>
> Replace "import std" with "import std.experimental.all".

`std.experimental.all` was introduced in the DMD 2.079.0 release 
[1], however starting with DMD 2.086.0 it was deprecated in favor 
of simpler `std` package name [2]. Usually, the D deprecation 
process is around 2 years (or 12 major releases), but since this 
feature was experimental (hence the std.experimental.all name), 
the deprecation process was fast tracked. `std.experimental.all` 
will most likely be removed starting with the 2.090.0 release.


[1]: https://dlang.org/changelog/2.079.0.html
[2]: https://dlang.org/changelog/2.086.0.html