This must be common, I just bombed a leetcode (tm) interview where I was asked to write code to share a method between two structs using traits in Rust without duplicating code. I couldn't remember a time I'd ever seen it done with generics so I tried to find it in the documentation but nothing. I looked up the solution after and it is not possible without writing a macro which is metaprogramming and seems like a poor way to assess how I'd perform writing Rust on a daily basis when I only had ~20 minutes to do it and was transparent that I am still learning the more advanced concepts. There were other red flags I ignored in the interview process, I look at it as a bullet dodged.