No we should not support enum types derived from strings

[Andrei Alexandrescu]

On 5/11/21 3:43 PM, Jon Degenhardt wrote:
> 
>      enum { f4 = "%d" }
>      writefln!f4(4);
> 
>      enum : string { f5 = "%d" }
>      writefln!f5(5);
> 
>      enum X { f6 = "%d" }
>      writefln!(X.f6)(6);   // Compilation error
> 
>      enum Y : string { f7 = "%d" }
>      writefln!(Y.f7)(7);   // Compilation error

Thanks. I agree it's confusing. The mystery gets elucidated with some 
ease if we write the types involved: f4 and f5 have type string, f6 has 
type X, and f7 have type Y.

It's unpleasant that `enum : string { f5 = "%d" }` is really the same as 
`enum f5 = "%d"`. I expected that some anonymous enum type would be 
generated.