String Switch Lowering

[Seb]

On Saturday, 27 January 2018 at 23:12:01 UTC, H. S. Teoh wrote:
> On Sat, Jan 27, 2018 at 09:22:07PM +0000, timotheecour via 
> Digitalmars-d wrote: [...]
>> ```
>> 28  dscanner                            0x000000010d59f428 
>> @safe void
>> ...
>
> I proposed a compile-time introspected getopt() replacement 
> before, only to get laughed at by Andrei.

Do you remember his motivation?
FYI: since Nov 2017 Druntime has exactly what you are proposing

https://github.com/dlang/druntime/blob/master/src/core/internal/parseoptions.d

However, it's not really sophisticated as it's intended only to 
be used for druntime, but then again, no one is stopping you from 
using it:


```
struct Config
{
     int a;
     string b;
     void help() @nogc nothrow {}
}

void main()
{
     import core.internal.parseoptions, std.stdio;

     string args = "a=42 b=foo";

     Config conf;
     conf.parseOptions(args);
     conf.writeln;
}
```


https://run.dlang.io/is/GVclu2