[OT] C# 6.0 ?. null propagation operator

[Atila Neves via Digitalmars-d]

On Tuesday, 21 April 2015 at 02:00:49 UTC, JT wrote:
> On Monday, 20 April 2015 at 21:22:53 UTC, deadalnix wrote:
>> ...
>> maybe(userManager).CurrentUser.GetRole().Name ?
>> ...
>
> Where can I find this "maybe" monad implementation?

In the Haskell prelude? :P

There was a blog post about monads in D I can no longer find. 
Other than that the only other one I know of is the gist I posted.

Atila