Life times variables

[m51]

Rust references are not the same thing as C++ references.

Here's a good reason why this type of lifetime elision isn't done:

Why no lifetime elision for structs?

The issue is documenting it to other users not to the compiler. We could easily add ellisions to structs that would cover every or nearly every case. The compiler would handle that just fine. The issue is that in the case of a struct, which you move around (unlike a function, which you just call), whether or not a struct is constrained to some lifetime matters a great deal. If we didn't require you to forward those lifetimes to the top of the type, the references may be nested in the private f…