File IO: C# streams VS iterators?

I was watching a dconf talk about porting C# code to D. One thing that came up was there isn't anything like C# streams for D. Walter said he thinks iterators (unless I remember wrong) is superior. The speaker agreed but said it isn't a drop in replacement so that is an issue if you want to por

Warnings/What should I know?

I'm learning D. I'm curious about surprises I may get. I typically use C++, C# and javascript