[Issue 17015] New: support final switch in std.variant

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17015

          Issue ID: 17015
           Summary: support final switch in std.variant
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: greeenify at gmail.com

As e.g. in https://github.com/s-ludwig/taggedalgebraic:


final switch (taggedAny.kind) {
    case Tagged.Kind.i:
        // It's "int i"
        break;

    case Tagged.Kind.str:
        // It's "string str"
        break;

    case Tagged.Kind.foo:
        // It's "Foo foo"
        break;
}

this has the advantage over visit that the compiler can enforce that all types
are covered.

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