run.dlang.io - a modern way to run D code

[Seb]

After it has been in stealth mode for quite a while, I'm happy to 
announce that there's https://run.dlang.io

=== Features ===

* Color-highlighted DMD errors
* Format source code with dfmt
* Generate a short URL for link sharing
* Import/Export to GitHub Gist
* Typical key shortcuts like CTRL+Enter -> Run
* Build cache for fast execution of common examples (e.g. the 
ones on front page of dlang.org)
* Usable on your phone
* Integrated with dlang.org (you can open any example on 
dlang.org in run.dlang.io by clicking the right arrow button)
* Integrated with tour.dlang.org (you can open any example on the 
DTour in run.dlang.io by clicking on the "Export" button)

=== Supported D Compilers ===

* Latest DMD nightly
* Latest DMD beta
* Latest DMD
* Latest LDC beta
* Latest LDC

The Docker images are rebuilt every day automatically.

=== Running DUB packages ===

Via "Add library" DUB packages can be added to the build.
Currently only a whitelist of packages is allowed.
Examples:

mir: https://run.dlang.io/is/FIc6rd
mir-algorithm: https://run.dlang.io/is/3pNRH8

=== DReg ===

When I watched CyberShadow's Bugzilla cruise [1] I spotted this 
amazing tool dreg [2] and it's not that hard to build a docker 
image [3] for it and make it available for everyone, s.t. no 
setup is required.
Dreg allows running old versions of the D compiler in parallel 
and compares their output.
However, it's a lot easier to show than to explain:

https://run.dlang.io/is/ckNT9i
https://run.dlang.io/is/UZhQDh

Currently all versions from 2.060 up to the latest greatest 
2.077.1 are run, so the execution will take a bit longer than a 
single run.

[1] https://youtu.be/qpUTvMokTCs
[2] https://github.com/CyberShadow/misc/blob/master/dreg.d
[3] https://github.com/dlang-tour/core-dreg


=== Source code & report issues ===

Please don't hesitate to open issues or submit pull requests:

-> https://github.com/dlang-tour/core

(it uses Vibe.d)