from the expansion of the macro `println` (in Nightly builds, run with -Z macro- backtrace for more info) help: consider cloning the value if the performance cost is acceptable | 3 | let s2 = s1.clone(); repository. See https://doc.rust-lang.org/cargo/reference/manifest.html#package-metadata for more info. --snip-- error: failed to publish to registry at https://crates.io Caused by: the remote server error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info) 326/562Rust 程序设计语言 简体中文版 For more information about this error, try `rustc --explain E0277`. error: