On Thursday, 20 October 2016 at 14:29:53 UTC, Satoshi wrote:
Oh, really? I didn't notice that... (sarcasm)If I change struct Foo to class Foo it works.
It's because for some weird reason, this type of varargs allows implicit construction of an object. I don't know why, it's just a feature that was added a long time ago and never removed. However as you can see, it doesn't work for structs and IMO you should never use it.
