The forgotten deprecation: switch case fall-through

[kdevel]

On Thursday, 3 December 2020 at 09:29:12 UTC, Bastiaan Veelo 
wrote:
> Switch case fallthrough (non-empty cases that do not end with a 
> break, continue, goto, return, throw or assert(0) statement) 
> has been deprecated for more than 9 years [1]. As I am fixing a 
> bug due to unintended case fall-through today, I am wondering 
> when its deprecation period will be ended.

For the non-trivial ArgumentList case [1] it has not even startet 
yet

~~~switchbreak.d
int foo (string s)
{
    int a;
    switch (s) {
       case "eins", "zwei":
          a = 1;
       default: // no warning
    }
    return a;
}

int bar (string s)
{
    int a;
    switch (s) {
       case "eins": case "zwei":
          a = 2;
       default: // deprecation warning
    }
    return a;
}

unittest {
    assert (foo ("") == 0);
    assert (foo ("eins") == 1);
    assert (foo ("zwei") == 1);
    assert (bar ("") == 0);
    assert (bar ("eins") == 2);
    assert (bar ("zwei") == 2);
}
~~~

$ dmd -unittest -main -run switchbreak
switchbreak.d(18): Deprecation: switch case fallthrough - use 
'goto default;' if intended
1 unittests passed


[1] https://dlang.org/spec/statement.html#switch-statement