What's the purpose of the 'in' keyword ?

Wed May 30 22:16:28 UTC 2018

On Sunday, 27 May 2018 at 16:00:15 UTC, Jonathan M Davis wrote:
> On Sunday, May 27, 2018 16:28:56 Russel Winder via 
> Digitalmars-d-learn wrote:
>> On Sun, 2018-05-27 at 13:10 +0000, Adam D. Ruppe via 
>> Digitalmars-d-learn
>>
> - Jonathan M Davis

Jonathan, which font were you using in your DConf powerpoint 
presentation for source code? It made the code look really 
nice...and also you have good naming skills.