comprehensive_rust/target/debug/.fingerprint/basics00-3922c6fa78ff0509/output-test-bin-basics00

{"message":"cannot borrow `a` as mutable because it is also borrowed as immutable","code":{"code":"E0502","explanation":"A variable already borrowed as immutable was borrowed as mutable.\n\nErroneous code example:\n\n```compile_fail,E0502\nfn bar(x: &mut i32) {}\nfn foo(a: &mut i32) {\n    let y = &a; // a is borrowed as immutable.\n    bar(a); // error: cannot borrow `*a` as mutable because `a` is also borrowed\n            //        as immutable\n    println!(\"{}\", y);\n}\n```\n\nTo fix this error, ensure that you don't have any other references to the\nvariable before trying to access it mutably:\n\n```\nfn bar(x: &mut i32) {}\nfn foo(a: &mut i32) {\n    bar(a);\n    let y = &a; // ok!\n    println!(\"{}\", y);\n}\n```\n\nFor more information on Rust's ownership system, take a look at the\n[References & Borrowing][references-and-borrowing] section of the Book.\n\n[references-and-borrowing]: https://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html\n"},"level":"error","spans":[{"file_name":"src/main.rs","byte_start":93,"byte_end":99,"line_start":7,"line_end":7,"column_start":27,"column_end":33,"is_primary":true,"text":[{"text":"        let c: &mut i32 = &mut a;","highlight_start":27,"highlight_end":33}],"label":"mutable borrow occurs here","suggested_replacement":null,"suggestion_applicability":null,"expansion":null},{"file_name":"src/main.rs","byte_start":56,"byte_end":58,"line_start":4,"line_end":4,"column_start":19,"column_end":21,"is_primary":false,"text":[{"text":"    let b: &i32 = &a;","highlight_start":19,"highlight_end":21}],"label":"immutable borrow occurs here","suggested_replacement":null,"suggestion_applicability":null,"expansion":null},{"file_name":"src/main.rs","byte_start":169,"byte_end":170,"line_start":12,"line_end":12,"column_start":19,"column_end":20,"is_primary":false,"text":[{"text":"    println!(\"b: {b}\");","highlight_start":19,"highlight_end":20}],"label":"immutable borrow later used here","suggested_replacement":null,"suggestion_applicability":null,"expansion":{"span":{"file_name":"/home/vbatts/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/macros.rs","byte_start":4158,"byte_end":4191,"line_start":136,"line_end":136,"column_start":28,"column_end":61,"is_primary":false,"text":[{"text":"        $crate::io::_print($crate::format_args_nl!($($arg)*));","highlight_start":28,"highlight_end":61}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":{"span":{"file_name":"src/main.rs","byte_start":155,"byte_end":173,"line_start":12,"line_end":12,"column_start":5,"column_end":23,"is_primary":false,"text":[{"text":"    println!(\"b: {b}\");","highlight_start":5,"highlight_end":23}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null},"macro_decl_name":"println!","def_site_span":{"file_name":"/home/vbatts/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/macros.rs","byte_start":4036,"byte_end":4056,"line_start":131,"line_end":131,"column_start":1,"column_end":21,"is_primary":false,"text":[{"text":"macro_rules! println {","highlight_start":1,"highlight_end":21}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}}},"macro_decl_name":"$crate::format_args_nl!","def_site_span":{"file_name":"/home/vbatts/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/macros/mod.rs","byte_start":31203,"byte_end":31230,"line_start":907,"line_end":907,"column_start":5,"column_end":32,"is_primary":false,"text":[{"text":"    macro_rules! format_args_nl {","highlight_start":5,"highlight_end":32}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}}}],"children":[],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;9merror[E0502]\u001b[0m\u001b[0m\u001b[1m: cannot borrow `a` as mutable because it is also borrowed as immutable\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:7:27\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m4\u001b[0m\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m    let b: &i32 = &a;\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m                  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12mimmutable borrow occurs here\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m...\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m7\u001b[0m\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m        let c: &mut i32 = &mut a;\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m                          \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9m^^^^^^\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9mmutable borrow occurs here\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m...\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m12\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m    println!(\"b: {b}\");\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m                  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m-\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12mimmutable borrow later used here\u001b[0m\n\n"}
{"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;9merror\u001b[0m\u001b[0m\u001b[1m: aborting due to previous error\u001b[0m\n\n"}
{"message":"For more information about this error, try `rustc --explain E0502`.","code":null,"level":"failure-note","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1mFor more information about this error, try `rustc --explain E0502`.\u001b[0m\n"}