[Issue 16173] Implicit fall through is silently allowed

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16173

--- Comment #1 from Nemanja Boric <4burgos at gmail.com> ---
(In reply to Nemanja Boric from comment #0)
> ```
> import std.stdio;
> import std.conv;
> void main(string[] argv)
> {
>     int x = to!(int)(argv[1]);
>     switch (x) {
>         case 1:
>             writeln("From 1");
>         case 2:
>             writeln("From 2");
>             x = 3;
>             break;
>         case 3:
>             x = 4;
>         default:
>             break;
>     }
> 
>     writeln("x = ", x);
> }
> ```
> ```
> $ rdmd test.d 1
> From 1
> From 2
> x = 3
> ```

DMD v2.071.0

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