Rust has had this bit of syntax sugar for a while now, it is used for structs. I think it's nice syntax, because it's located in a place where there's no doubt

Rust has had this bit of syntax sugar for a while now, it is used for structs. I think it's nice syntax, because it's located in a place where there's no doubt about the meaning. Both Rust structs and Ruby hashes are defined in-language as key-value sets, so whenever there's just one element instead of a pair, it's clear what the meaning is.