> `collect()` doesn't know what type of collection to collect into. Yes, unless there is some other mention of Vec, i.e. it is returned from the function. > T

> `collect()` doesn't know what type of collection to collect into. Yes, unless there is some other mention of Vec, i.e. it is returned from the function. > This is impossible without varargs, no? Varargs would definitely help, and would allow Rust to borrow more ideas without workarounds. But one can do it manually for each tuple variant.