D has a built-in GC by default and doesn't force you to manage memory like Rust. Also, the author mentioned that D is pretty straightforward to anyone with some basic programming knowledge (think C, C++, Java, and C# which fits the majority of coders). Rust is very different from those languages. My main goto language is Python and I can understand D a lot more than Rust which confuses me to no end (disclaimer: I'm a total noob).
Go is probably as easy to read as D if not more and is also GC and fast. It is also very spartan. I bet D has a lot of additional features.
With Rust I always find myself fighting the compiler just like with C, it's very strict about everything, no GC, steep learning curve.
Go is okay but you can't get clever with it. You're productive from the start butit becomes routine quite fast and at a certain point there isn't anything new to learn. Error checking is also quite annoying.
D has the best of both worlds and it also plays nicely with C/C++, something that the author of Zig also understood is a must have in any language that aims to be a better C/C++. In D one is productive from the start and there's always something new to learn. And one learns it as they code, without having to first read Programming in D by Ali Çehreli to make any sense of the language.
I also tried Crystal and liked it but one is more productive in D and Go without any prior knowledge of those languages. I was kind of annoyed by the fact that Crystal removed the for loop, which works perfectly fine in Ruby.
If you fight with the rust compiler the same amount as you do with a C compiler than you're making something wrong in both languages. Don't get me wrong but the rust and C compiler are on the direct opposite of the spectrum – for me. I love how the rust compiler is holding my hand to avoid all the nasty bugs i would introduce into my code.
The overall experience is similar. Rust definitely has better error messages. The difference is that in C once your program actually compliles it can also easily segfault at runtime. With D and Go you just compile the program and it works. It only complains when you're doing something awfully wrong instead of being a grammar nazi all the time. Additionaly, D allows you to enable or disable certain features if you wish to. Want safety? Use @safe and @trusted functions. Want to disable the GC? Use @nogc functions. And the list goes on. One can enable all of these on demand.
Don't get me wrong, I like a language with a Gc by default, my favourite language is OCaml, but I can't claim it to be a drop-in replacement for C projects. Go, Rust (or D) stand a better chance at that.
