C# Proposal for Nullability Checking

[Meta via Digitalmars-d]

https://github.com/dotnet/roslyn/issues/5032

There've always been rumblings here about removing nullable 
references from D, but that's a large break in backwards 
compatibility that we can't really afford at this point (outside 
some magic compiler switch). This C# proposal has some 
interesting ideas on how assisting the programmer in avoiding 
null pointer dereferencing can be balanced with 
backwards-compatibility concerns. I think there's some valuable 
stuff in here that could potentially be applied in D as well.