Adding the ?. null verification

[Andrei Alexandrescu via Digitalmars-d]

On 6/19/14, 1:29 PM, Etienne wrote:
> writeln(currAssignment.safeDeref.typeInfo.ident.or("meh"));

"or" is really nice and terse. I think we should add that to std. 
safeDeref isn't the best choice of name.

Andrei