Here's the test case:
auto e = new shared(Exception)("hi");
writeln(e);
and the error:
std/format.d(1293): Error: function object.Throwable.toString () is not
callable using argument types ()
I'm guessing this is because toString() isn't a shared method. Interestingly,
also means that it isn't possible to put a shared class into a Variant, since
it provides a toString method. So I guess it's becoming pretty important to
sort out the qualifiers for Object methods. I'd considered providing both a
shared and unshared toString (and others), but then child classes defining only
one get compile errors about hiding the method in question. It doesn't seem
reasonable to expect people to supply both, and I don't believe inout works for
the hidden "this" parameter, so... ideas? I don't know that we can provide
only a shared version of these methods because they may reference non-shared
static data so I'm at a bit of a loss for what to do.
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