[Issue 14931] switch doesn't work with any pointers

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14931

Andrei Alexandrescu <andrei at erdani.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Hardware|x86                         |All
                 OS|Mac OS X                    |All

--- Comment #1 from Andrei Alexandrescu <andrei at erdani.com> ---
Consider:

void fun(T)() {}
alias Ptr = void function() pure nothrow @nogc @safe;

void main(string[] argv) {
    enum a = &fun!int;
    static immutable Ptr b = &fun!double;
    static assert(a != b);

    Ptr p;
    switch (p)
    {
        case a: break;
        case b: break;
    }
}

The first three lines in main() clarify that pointers to functions can be
evaluated and compared during compilation. Yet the switch statement does not
work.

This applies to general pointers - switch does not work with any pointers, yet
it should work because pointers are comparable and there exist constant
pointers.

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