Reimplementing the bulk of std.meta iteratively

[Mike]

On Saturday, 26 September 2020 at 16:18:27 UTC, Andrei 
Alexandrescu wrote:

> Commments and ideas for improvements are welcome.

If you're going to go through the trouble of re-implementing 
std.meta, please move it to druntime so it can be leveraged by 
the DMD frontend and the druntime implementation, among other 
benefits.  std.meta can then forward to the druntime 
implementations for backward compatibility.