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

loloof64 laurent.bernabe at gmail.com
Sun May 27 13:02:23 UTC 2018

Hello everyone,

I've just completed the language tour, and I am starting a 
tutorial in order to use Gtk binding.

But somewhere, they use the 'in' keyword for the constructor : 
(https://sites.google.com/site/gtkdtutorial/#chapter2 : in 
section 3 for Buttons and Callbacks, main.d snippet).

What's the purpose of this 'in' keyword ? I could not process a 
good Google request to get an answer.


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