Structs with pointers?

[Dan Olson]

bearophile <bearophileHUGS at lycos.com> writes:

>> Is this another compiler bug?
>
> The situation is nice:
>
> struct Foo1 {}
> struct Foo2 { int x; }
> const struct Foo3 { int* p; }
> struct Foo4 { int* p; }
> void bar1(Foo1 f) {}
> void bar2(Foo2 f) {}
> void bar3(Foo3 f) {}
> void bar4(Foo4 f) {}
> void main() {
>     const f1 = Foo1();
>     bar1(f1); // no error
>     const f2 = Foo2();
>     bar2(f2); // no error
>     const f3 = Foo3();
>     bar3(f3); // no error
>     const f4 = Foo4();
>     bar4(f4); // error
> }
>
> Bye,
> bearophile

I was going to say its because structs are passed by value.  But then I
changed bar2 to bar2(ref Foo2 f) {f.x = 2;} and that compiled without
error and even changed f2.x to 2 when I printed it.  That seems like a
bug.