Implicit fall through not detected (Example from lex.html)

[Ali Çehreli via Digitalmars-d-learn]

On 03/02/2015 10:58 PM, Andre wrote:
> Hi,
>
> I am little bit confused. I am copied the switch example from lex.html
> and expected that case 6 will lead to a syntax error due to the missing
> break statement. But the example compiles without error (C:>dmd app)
>
> I tried 3 different dmd version, also the newest beta.
>
> Kind regards
> André
>
> import std.stdio: writeln;
>
> void main()
> {
>
> int number;
> string message;
>
> switch (number)
> {
>    default:    // valid
>      throw new Exception("unknown number");
>
>    case 3:     // valid
>      message ~= "three ";
>      break;
>
>    case 5:     // valid
>      message ~= "five ";
>      goto case;
>
>    case 6:     // ERROR: implicit fall-through
>      message ~= "six ";
>
>    case 1:     // valid
>    case 2:     // valid
>      message = "one or two";
> }
>
> }

Compile with -w command line switch. :)

Ali