"I'm not aware of any library which uses struct tags to encode anything that anyone might call a DSL." There's a couple of struct validation libraries that got

"I'm not aware of any library which uses struct tags to encode anything that anyone might call a DSL." There's a couple of struct validation libraries that got IMHO a bit overexcited with what you can jam in a struct tag and then interpret, but they don't seem to have gotten very popular, so it doesn't factor into the language much.