Pattern matching in D?

[Dennis Ritchie via Digitalmars-d]

On Friday, 21 October 2016 at 02:16:44 UTC, Chris M. wrote:
> So I know you can do some pattern matching with templates in D, 
> but has there been any discussion about implementing it as a 
> language feature, maybe something similar to Rust's match 
> keyword (https://doc.rust-lang.org/stable/book/patterns.html)? 
> What would your guys' thoughts be?

On this topic there were many discussions. Here are some of them:

http://forum.dlang.org/post/mhdcpnnydgspxllismlb@forum.dlang.org
http://forum.dlang.org/post/znfrdjkpxtixiydxpcbr@forum.dlang.org
http://forum.dlang.org/post/ugiypegvtdhhvzrmfuua@forum.dlang.org

The problem is that D is not macros, and the implementation of 
pattern matching without macros will not be very good. In turn, 
the implementation of macros in D - this is also not a good idea.

Previously, there were ideas on the implementation of macros in 
D, but now they are no longer relevant:
http://s3.amazonaws.com/dconf2007/WalterAndrei.pdf