The code says to call into_iter and consume the iteratee, so rust does that. If you want a reference, use the &, just like in zig/c/c++/etc. You are saying an e

The code says to call into_iter and consume the iteratee, so rust does that. If you want a reference, use the &, just like in zig/c/c++/etc. You are saying an even more extreme version of "If there's a way what I wrote could possibly be interpreted that could compile, it should do that" ignoring the fact that there's almost assuredly _many_ ways that your code can be interpreted that could compile. Slowing down type resolution/compilation (by making every unannotated loop a generic T|&T) and adding more syntax (since rust would need new annotations to explicitly specify borrow/take in for loops), in order to save a single character that matches the behavior of most other related languages and is perfectly clearly explained by the compiler, is maybe a bad move. Considering compile time and complicated syntax are two of the biggest things people who actually write rust complain about.