Nothrow std.conv.to with explicit default value

[Per Nordlöw]

On Wednesday, 20 June 2018 at 09:27:14 UTC, Per Nordlöw wrote:
> On Monday, 18 June 2018 at 21:10:03 UTC, Steven Schveighoffer 
> wrote:
>> It just means re-doing std.conv.to, which is pretty hairy, but 
>> also pretty well-organized.
>
> Ok. Where in std.conv do the string-to-enum conversions take 
> place?

AFAICT, string-to-enum-conversion must include a switch 
containing a static foreach over all the enumerators, right?