Enumeration Type-Safety in D

[Namespace]

On Thursday, 7 November 2013 at 13:25:40 UTC, Nordlöw wrote:
> What is the state and plans on type-safety of enums in D?
>
> I expected
>
> import std.stdio: writeln;
>
> void main(string args[]) {
>     enum E {x, y, z}
>     E e;
>     writeln(e);
>     e = cast(E)3;
>     writeln(e);
> }
>
> to fail to compile because of D's otherwise strong static 
> type/range checking or at least give an RangeException when run.
>
> To my surprise, it instead prints
>
> cast(E)3
>
> Is this really the preferred default behaviour for the majority 
> of use cases?

Use std.conv : to:

e = to!E(3);

results in:
std.conv.ConvException@/opt/compilers/dmd2/include/std/conv.d(1854): 
Value (3) does not match any member value of enum 'E'