Comment by saghm

I was surprised but pleased to see this was a declarative macro rather than a proc macro. While proc macros are more powerful, there's a surprising amount of expressive power in the declarative ones, and I'm fond of playing around with them to figure out how to stretch them beyond where it seems like they should be able to get (and maybe shouldn't be used for in real code, but that doesn't make it less fun for playing around!)