[INFO] cloning repository https://github.com/UedaA0816/rust-learn [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/UedaA0816/rust-learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUedaA0816%2Frust-learn", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUedaA0816%2Frust-learn'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] e96ed82193c74fe6e8af6ac523d09694b8d0335d [INFO] testing UedaA0816/rust-learn against try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_libc_patch_0 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUedaA0816%2Frust-learn" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/UedaA0816/rust-learn [INFO] finished tweaking git repo https://github.com/UedaA0816/rust-learn [INFO] tweaked toml for git repo https://github.com/UedaA0816/rust-learn written to /workspace/builds/worker-1-tc1/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/UedaA0816/rust-learn on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/UedaA0816/rust-learn already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded getrandom v0.2.4 [INFO] [stderr] Downloaded libc v0.2.112 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 1ae9480fdefe0f3aa474a4feb6f7dada0c8caccb20d72e0efd9daf0d5c5908d4 [INFO] running `Command { std: "docker" "start" "-a" "1ae9480fdefe0f3aa474a4feb6f7dada0c8caccb20d72e0efd9daf0d5c5908d4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "1ae9480fdefe0f3aa474a4feb6f7dada0c8caccb20d72e0efd9daf0d5c5908d4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1ae9480fdefe0f3aa474a4feb6f7dada0c8caccb20d72e0efd9daf0d5c5908d4", kill_on_drop: false }` [INFO] [stdout] 1ae9480fdefe0f3aa474a4feb6f7dada0c8caccb20d72e0efd9daf0d5c5908d4 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }` [INFO] [stdout] a6f9665173548b5305ae9aef8a0bd3bf3f92f60db6127c07706a33f4fb06d92c [INFO] running `Command { std: "docker" "start" "-a" "a6f9665173548b5305ae9aef8a0bd3bf3f92f60db6127c07706a33f4fb06d92c", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.112 [INFO] [stderr] Compiling getrandom v0.2.4 [INFO] [stderr] Compiling rand_core v0.6.3 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling rand v0.8.4 [INFO] [stderr] Compiling rust-learn v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `std::io::ErrorKind` [INFO] [stdout] --> src/chapters/ch9_2.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::io::ErrorKind; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `guess` [INFO] [stdout] --> src/chapters/ch3_2.rs:4:7 [INFO] [stdout] | [INFO] [stdout] 4 | let guess: u32 = "42".parse().expect("Not a number!"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/chapters/ch3_2.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let x = 2.0; // f64 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/chapters/ch3_2.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let y: f32 = 3.0; // f32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sum` [INFO] [stdout] --> src/chapters/ch3_2.rs:13:7 [INFO] [stdout] | [INFO] [stdout] 13 | let sum = 5 + 10; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_sum` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `difference` [INFO] [stdout] --> src/chapters/ch3_2.rs:16:7 [INFO] [stdout] | [INFO] [stdout] 16 | let difference = 95.5 - 4.3; [INFO] [stdout] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difference` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `product` [INFO] [stdout] --> src/chapters/ch3_2.rs:19:7 [INFO] [stdout] | [INFO] [stdout] 19 | let product = 4 * 30; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_product` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `quotient` [INFO] [stdout] --> src/chapters/ch3_2.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let quotient = 56.7 / 32.2; [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotient` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `floored` [INFO] [stdout] --> src/chapters/ch3_2.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let floored = 2 / 3; // Results in 0 [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_floored` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `remainder` [INFO] [stdout] --> src/chapters/ch3_2.rs:26:7 [INFO] [stdout] | [INFO] [stdout] 26 | let remainder = 43 % 5; [INFO] [stdout] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_remainder` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/chapters/ch3_2.rs:29:7 [INFO] [stdout] | [INFO] [stdout] 29 | let t = true; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/chapters/ch3_2.rs:31:7 [INFO] [stdout] | [INFO] [stdout] 31 | let f: bool = false; // with explicit type annotation [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/chapters/ch3_2.rs:34:7 [INFO] [stdout] | [INFO] [stdout] 34 | let c = 'z'; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/chapters/ch3_2.rs:35:7 [INFO] [stdout] | [INFO] [stdout] 35 | let z = 'ℤ'; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `heart_eyed_cat` [INFO] [stdout] --> src/chapters/ch3_2.rs:36:7 [INFO] [stdout] | [INFO] [stdout] 36 | let heart_eyed_cat = '😻'; [INFO] [stdout] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heart_eyed_cat` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `five_hundred` [INFO] [stdout] --> src/chapters/ch3_2.rs:41:7 [INFO] [stdout] | [INFO] [stdout] 41 | let five_hundred = tup.0; [INFO] [stdout] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_five_hundred` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six_point_four` [INFO] [stdout] --> src/chapters/ch3_2.rs:43:7 [INFO] [stdout] | [INFO] [stdout] 43 | let six_point_four = tup.1; [INFO] [stdout] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_six_point_four` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `one` [INFO] [stdout] --> src/chapters/ch3_2.rs:45:7 [INFO] [stdout] | [INFO] [stdout] 45 | let one = tup.2; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_one` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> src/chapters/ch3_2.rs:48:7 [INFO] [stdout] | [INFO] [stdout] 48 | let a = [1, 2, 3, 4, 5]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `months` [INFO] [stdout] --> src/chapters/ch3_2.rs:50:7 [INFO] [stdout] | [INFO] [stdout] 50 | let months = ["January", "February", "March", "April", "May", "June", "July","August", "September", "October", "November", "December"]; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_months` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> src/chapters/ch3_2.rs:52:7 [INFO] [stdout] | [INFO] [stdout] 52 | let a: [i32; 5] = [1, 2, 3, 4, 5]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/chapters/ch3_3.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let y = 6; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `lucky_number` [INFO] [stdout] --> src/chapters/ch3_4.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let lucky_number = 7; // I’m feeling lucky today [INFO] [stdout] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lucky_number` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `lucky_number` [INFO] [stdout] --> src/chapters/ch3_4.rs:12:7 [INFO] [stdout] | [INFO] [stdout] 12 | let lucky_number = 7; [INFO] [stdout] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lucky_number` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/chapters/ch4_1.rs:12:7 [INFO] [stdout] | [INFO] [stdout] 12 | let s = "hello"; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/chapters/ch4_1.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let y = x; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> src/chapters/ch4_1.rs:33:7 [INFO] [stdout] | [INFO] [stdout] 33 | let s2 = s1.clone(); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/chapters/ch4_1.rs:38:7 [INFO] [stdout] | [INFO] [stdout] 38 | let s1 = gives_ownership(); // gives_ownership moves its return [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s3` [INFO] [stdout] --> src/chapters/ch4_1.rs:42:7 [INFO] [stdout] | [INFO] [stdout] 42 | let s3 = takes_and_gives_back(s2); // s2 is moved into [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/chapters/ch4_2.rs:20:7 [INFO] [stdout] | [INFO] [stdout] 20 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/chapters/ch4_2.rs:21:7 [INFO] [stdout] | [INFO] [stdout] 21 | let r2 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/chapters/ch4_2.rs:30:9 [INFO] [stdout] | [INFO] [stdout] 30 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/chapters/ch4_2.rs:33:7 [INFO] [stdout] | [INFO] [stdout] 33 | let r2 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/chapters/ch4_2.rs:38:7 [INFO] [stdout] | [INFO] [stdout] 38 | let r1 = &s; // no problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/chapters/ch4_2.rs:39:7 [INFO] [stdout] | [INFO] [stdout] 39 | let r2 = &s; // no problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/chapters/ch4_2.rs:36:7 [INFO] [stdout] | [INFO] [stdout] 36 | let mut s = String::from("hello"); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/chapters/ch4_3.rs:12:7 [INFO] [stdout] | [INFO] [stdout] 12 | let slice = &s[0..2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/chapters/ch4_3.rs:13:7 [INFO] [stdout] | [INFO] [stdout] 13 | let slice = &s[..2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/chapters/ch4_3.rs:16:7 [INFO] [stdout] | [INFO] [stdout] 16 | let mut text2 = String::from("hello_world"); [INFO] [stdout] | ----^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user1` [INFO] [stdout] --> src/chapters/ch5_1.rs:13:7 [INFO] [stdout] | [INFO] [stdout] 13 | let user1 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user3` [INFO] [stdout] --> src/chapters/ch5_1.rs:24:7 [INFO] [stdout] | [INFO] [stdout] 24 | let user3 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `black` [INFO] [stdout] --> src/chapters/ch5_1.rs:31:7 [INFO] [stdout] | [INFO] [stdout] 31 | let black = Color(0, 0, 0); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_black` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `origin` [INFO] [stdout] --> src/chapters/ch5_1.rs:32:7 [INFO] [stdout] | [INFO] [stdout] 32 | let origin = Point(0, 0, 0); [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `rect4` [INFO] [stdout] --> src/chapters/ch5_3.rs:38:7 [INFO] [stdout] | [INFO] [stdout] 38 | let rect4 = Rectangle::square(100); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect4` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `four` [INFO] [stdout] --> src/chapters/ch6_1.rs:43:7 [INFO] [stdout] | [INFO] [stdout] 43 | let four = IpAddrKind::V4; [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_four` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six` [INFO] [stdout] --> src/chapters/ch6_1.rs:44:7 [INFO] [stdout] | [INFO] [stdout] 44 | let six = IpAddrKind::V6; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_six` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `home` [INFO] [stdout] --> src/chapters/ch6_1.rs:47:7 [INFO] [stdout] | [INFO] [stdout] 47 | let home = IpAddr { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_home` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `loopback` [INFO] [stdout] --> src/chapters/ch6_1.rs:52:7 [INFO] [stdout] | [INFO] [stdout] 52 | let loopback = IpAddr { [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `home` [INFO] [stdout] --> src/chapters/ch6_1.rs:58:7 [INFO] [stdout] | [INFO] [stdout] 58 | let home = IpAddr2::V4(String::from("127.0.0.1")); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_home` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `loopback` [INFO] [stdout] --> src/chapters/ch6_1.rs:60:7 [INFO] [stdout] | [INFO] [stdout] 60 | let loopback = IpAddr2::V6(String::from("::1")); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `home` [INFO] [stdout] --> src/chapters/ch6_1.rs:63:7 [INFO] [stdout] | [INFO] [stdout] 63 | let home = IpAddr3::V4(127, 0, 0, 1); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_home` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `loopback` [INFO] [stdout] --> src/chapters/ch6_1.rs:65:7 [INFO] [stdout] | [INFO] [stdout] 65 | let loopback = IpAddr3::V6(String::from("::1")); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `some_number` [INFO] [stdout] --> src/chapters/ch6_1.rs:68:7 [INFO] [stdout] | [INFO] [stdout] 68 | let some_number = Some(5); [INFO] [stdout] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_number` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `some_string` [INFO] [stdout] --> src/chapters/ch6_1.rs:69:7 [INFO] [stdout] | [INFO] [stdout] 69 | let some_string = Some("a string"); [INFO] [stdout] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `absent_number` [INFO] [stdout] --> src/chapters/ch6_1.rs:71:7 [INFO] [stdout] | [INFO] [stdout] 71 | let absent_number: Option = None; [INFO] [stdout] | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_absent_number` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `cents` [INFO] [stdout] --> src/chapters/ch6_2.rs:18:7 [INFO] [stdout] | [INFO] [stdout] 18 | let cents = value_in_cents(Coin::Quarter(UsState::Alabama)); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_cents` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six` [INFO] [stdout] --> src/chapters/ch6_2.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let six = plus_one(five); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_six` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `none` [INFO] [stdout] --> src/chapters/ch6_2.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let none = plus_one(None); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_none` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/chapters/ch8_1.rs:16:7 [INFO] [stdout] | [INFO] [stdout] 16 | let v = vec![1, 2, 3]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `third` [INFO] [stdout] --> src/chapters/ch8_1.rs:21:7 [INFO] [stdout] | [INFO] [stdout] 21 | let third: &i32 = &v[2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_third` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `third` [INFO] [stdout] --> src/chapters/ch8_1.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let third: Option<&i32> = v.get(2); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_third` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `SpreadsheetCell` [INFO] [stdout] --> src/chapters/ch8_1.rs:33:15 [INFO] [stdout] | [INFO] [stdout] 33 | if let Some(SpreadsheetCell) = third { [INFO] [stdout] | ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_SpreadsheetCell` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s3` [INFO] [stdout] --> src/chapters/ch8_2.rs:16:7 [INFO] [stdout] | [INFO] [stdout] 16 | let s3 = s1 + &s2; // s1はムーブされ、もう使用できないことに注意 [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/chapters/ch8_2.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `len` [INFO] [stdout] --> src/chapters/ch8_2.rs:26:7 [INFO] [stdout] | [INFO] [stdout] 26 | let len = String::from("Hola").len(); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `len` [INFO] [stdout] --> src/chapters/ch8_2.rs:29:7 [INFO] [stdout] | [INFO] [stdout] 29 | let len = String::from("Здравствуйте").len(); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/chapters/ch8_2.rs:34:7 [INFO] [stdout] | [INFO] [stdout] 34 | let s = &hello[0..4]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `username`, `email`, `sign_in_count`, and `active` are never read [INFO] [stdout] --> src/chapters/ch5_1.rs:3:3 [INFO] [stdout] | [INFO] [stdout] 2 | struct User { [INFO] [stdout] | ---- fields in this struct [INFO] [stdout] 3 | username: String, [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] 4 | email: String, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 5 | sign_in_count: u64, [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] 6 | active: bool, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `0`, `1`, and `2` are never read [INFO] [stdout] --> src/chapters/ch5_1.rs:9:14 [INFO] [stdout] | [INFO] [stdout] 9 | struct Color(i32, i32, i32); [INFO] [stdout] | ----- ^^^ ^^^ ^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing these fields [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `0`, `1`, and `2` are never read [INFO] [stdout] --> src/chapters/ch5_1.rs:10:14 [INFO] [stdout] | [INFO] [stdout] 10 | struct Point(i32, i32, i32); [INFO] [stdout] | ----- ^^^ ^^^ ^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing these fields [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `kind` and `address` are never read [INFO] [stdout] --> src/chapters/ch6_1.rs:8:3 [INFO] [stdout] | [INFO] [stdout] 7 | struct IpAddr { [INFO] [stdout] | ------ fields in this struct [INFO] [stdout] 8 | kind: IpAddrKind, [INFO] [stdout] | ^^^^ [INFO] [stdout] 9 | address: String, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch6_1.rs:14:6 [INFO] [stdout] | [INFO] [stdout] 14 | V4(String), [INFO] [stdout] | -- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 14 - V4(String), [INFO] [stdout] 14 + V4(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch6_1.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | V6(String), [INFO] [stdout] | -- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 15 - V6(String), [INFO] [stdout] 15 + V6(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read [INFO] [stdout] --> src/chapters/ch6_1.rs:19:6 [INFO] [stdout] | [INFO] [stdout] 19 | V4(u8, u8, u8, u8), [INFO] [stdout] | -- ^^ ^^ ^^ ^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields [INFO] [stdout] | [INFO] [stdout] 19 - V4(u8, u8, u8, u8), [INFO] [stdout] 19 + V4((), (), (), ()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch6_1.rs:20:6 [INFO] [stdout] | [INFO] [stdout] 20 | V6(String), [INFO] [stdout] | -- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 20 - V6(String), [INFO] [stdout] 20 + V6(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum `Message` is never used [INFO] [stdout] --> src/chapters/ch6_1.rs:24:6 [INFO] [stdout] | [INFO] [stdout] 24 | enum Message { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `call` is never used [INFO] [stdout] --> src/chapters/ch6_1.rs:32:6 [INFO] [stdout] | [INFO] [stdout] 31 | impl Message { [INFO] [stdout] | ------------ method in this implementation [INFO] [stdout] 32 | fn call(&self) { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant `Alaska` is never constructed [INFO] [stdout] --> src/chapters/ch6_2.rs:5:5 [INFO] [stdout] | [INFO] [stdout] 3 | enum UsState { [INFO] [stdout] | ------- variant in this enum [INFO] [stdout] 4 | Alabama, [INFO] [stdout] 5 | Alaska, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed [INFO] [stdout] --> src/chapters/ch6_2.rs:10:3 [INFO] [stdout] | [INFO] [stdout] 9 | enum Coin { [INFO] [stdout] | ---- variants in this enum [INFO] [stdout] 10 | Penny, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 11 | Nickel, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] 12 | Dime, [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch8_1.rs:3:7 [INFO] [stdout] | [INFO] [stdout] 3 | Int(i32), [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 3 - Int(i32), [INFO] [stdout] 3 + Int(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch8_1.rs:4:9 [INFO] [stdout] | [INFO] [stdout] 4 | Float(f64), [INFO] [stdout] | ----- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 4 - Float(f64), [INFO] [stdout] 4 + Float(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch8_1.rs:5:8 [INFO] [stdout] | [INFO] [stdout] 5 | Text(String), [INFO] [stdout] | ---- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 5 - Text(String), [INFO] [stdout] 5 + Text(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `summarize_author` is never used [INFO] [stdout] --> src/chapters/ch10_2.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 1 | pub trait Summary { [INFO] [stdout] | ------- method in this trait [INFO] [stdout] ... [INFO] [stdout] 7 | fn summarize_author(&self) -> String; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `content` is never read [INFO] [stdout] --> src/chapters/ch10_2.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 18 | pub struct NewsArticle { [INFO] [stdout] | ----------- field in this struct [INFO] [stdout] ... [INFO] [stdout] 22 | pub content: String, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `reply` and `retweet` are never read [INFO] [stdout] --> src/chapters/ch10_2.rs:41:7 [INFO] [stdout] | [INFO] [stdout] 38 | pub struct Tweet { [INFO] [stdout] | ----- fields in this struct [INFO] [stdout] ... [INFO] [stdout] 41 | pub reply: bool, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 42 | pub retweet: bool, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `notify_syntax_sugar` is never used [INFO] [stdout] --> src/chapters/ch10_2.rs:108:8 [INFO] [stdout] | [INFO] [stdout] 108 | pub fn notify_syntax_sugar(item: &T) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `notify_multi_trait` is never used [INFO] [stdout] --> src/chapters/ch10_2.rs:113:8 [INFO] [stdout] | [INFO] [stdout] 113 | pub fn notify_multi_trait(item: &(impl Summary + Display)) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `SpreadsheetCell` should have a snake case name [INFO] [stdout] --> src/chapters/ch8_1.rs:33:15 [INFO] [stdout] | [INFO] [stdout] 33 | if let Some(SpreadsheetCell) = third { [INFO] [stdout] | ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `spreadsheet_cell` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.28s [INFO] running `Command { std: "docker" "inspect" "a6f9665173548b5305ae9aef8a0bd3bf3f92f60db6127c07706a33f4fb06d92c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a6f9665173548b5305ae9aef8a0bd3bf3f92f60db6127c07706a33f4fb06d92c", kill_on_drop: false }` [INFO] [stdout] a6f9665173548b5305ae9aef8a0bd3bf3f92f60db6127c07706a33f4fb06d92c [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "test" "--frozen" "--no-run" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }` [INFO] [stdout] c6f27af46493c69bfb143de8334aedd5e4059bbdcaf2b2928ef43fafd5624c9d [INFO] running `Command { std: "docker" "start" "-a" "c6f27af46493c69bfb143de8334aedd5e4059bbdcaf2b2928ef43fafd5624c9d", kill_on_drop: false }` [INFO] [stderr] Compiling rust-learn v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `std::io::ErrorKind` [INFO] [stdout] --> src/chapters/ch9_2.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::io::ErrorKind; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `guess` [INFO] [stdout] --> src/chapters/ch3_2.rs:4:7 [INFO] [stdout] | [INFO] [stdout] 4 | let guess: u32 = "42".parse().expect("Not a number!"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/chapters/ch3_2.rs:7:7 [INFO] [stdout] | [INFO] [stdout] 7 | let x = 2.0; // f64 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/chapters/ch3_2.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let y: f32 = 3.0; // f32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sum` [INFO] [stdout] --> src/chapters/ch3_2.rs:13:7 [INFO] [stdout] | [INFO] [stdout] 13 | let sum = 5 + 10; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_sum` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `difference` [INFO] [stdout] --> src/chapters/ch3_2.rs:16:7 [INFO] [stdout] | [INFO] [stdout] 16 | let difference = 95.5 - 4.3; [INFO] [stdout] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difference` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `product` [INFO] [stdout] --> src/chapters/ch3_2.rs:19:7 [INFO] [stdout] | [INFO] [stdout] 19 | let product = 4 * 30; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_product` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `quotient` [INFO] [stdout] --> src/chapters/ch3_2.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let quotient = 56.7 / 32.2; [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotient` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `floored` [INFO] [stdout] --> src/chapters/ch3_2.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let floored = 2 / 3; // Results in 0 [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_floored` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `remainder` [INFO] [stdout] --> src/chapters/ch3_2.rs:26:7 [INFO] [stdout] | [INFO] [stdout] 26 | let remainder = 43 % 5; [INFO] [stdout] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_remainder` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/chapters/ch3_2.rs:29:7 [INFO] [stdout] | [INFO] [stdout] 29 | let t = true; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/chapters/ch3_2.rs:31:7 [INFO] [stdout] | [INFO] [stdout] 31 | let f: bool = false; // with explicit type annotation [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/chapters/ch3_2.rs:34:7 [INFO] [stdout] | [INFO] [stdout] 34 | let c = 'z'; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/chapters/ch3_2.rs:35:7 [INFO] [stdout] | [INFO] [stdout] 35 | let z = 'ℤ'; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `heart_eyed_cat` [INFO] [stdout] --> src/chapters/ch3_2.rs:36:7 [INFO] [stdout] | [INFO] [stdout] 36 | let heart_eyed_cat = '😻'; [INFO] [stdout] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heart_eyed_cat` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `five_hundred` [INFO] [stdout] --> src/chapters/ch3_2.rs:41:7 [INFO] [stdout] | [INFO] [stdout] 41 | let five_hundred = tup.0; [INFO] [stdout] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_five_hundred` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six_point_four` [INFO] [stdout] --> src/chapters/ch3_2.rs:43:7 [INFO] [stdout] | [INFO] [stdout] 43 | let six_point_four = tup.1; [INFO] [stdout] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_six_point_four` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `one` [INFO] [stdout] --> src/chapters/ch3_2.rs:45:7 [INFO] [stdout] | [INFO] [stdout] 45 | let one = tup.2; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_one` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> src/chapters/ch3_2.rs:48:7 [INFO] [stdout] | [INFO] [stdout] 48 | let a = [1, 2, 3, 4, 5]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `months` [INFO] [stdout] --> src/chapters/ch3_2.rs:50:7 [INFO] [stdout] | [INFO] [stdout] 50 | let months = ["January", "February", "March", "April", "May", "June", "July","August", "September", "October", "November", "December"]; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_months` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> src/chapters/ch3_2.rs:52:7 [INFO] [stdout] | [INFO] [stdout] 52 | let a: [i32; 5] = [1, 2, 3, 4, 5]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/chapters/ch3_3.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let y = 6; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `lucky_number` [INFO] [stdout] --> src/chapters/ch3_4.rs:9:7 [INFO] [stdout] | [INFO] [stdout] 9 | let lucky_number = 7; // I’m feeling lucky today [INFO] [stdout] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lucky_number` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `lucky_number` [INFO] [stdout] --> src/chapters/ch3_4.rs:12:7 [INFO] [stdout] | [INFO] [stdout] 12 | let lucky_number = 7; [INFO] [stdout] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lucky_number` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/chapters/ch4_1.rs:12:7 [INFO] [stdout] | [INFO] [stdout] 12 | let s = "hello"; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/chapters/ch4_1.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let y = x; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> src/chapters/ch4_1.rs:33:7 [INFO] [stdout] | [INFO] [stdout] 33 | let s2 = s1.clone(); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/chapters/ch4_1.rs:38:7 [INFO] [stdout] | [INFO] [stdout] 38 | let s1 = gives_ownership(); // gives_ownership moves its return [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s3` [INFO] [stdout] --> src/chapters/ch4_1.rs:42:7 [INFO] [stdout] | [INFO] [stdout] 42 | let s3 = takes_and_gives_back(s2); // s2 is moved into [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/chapters/ch4_2.rs:20:7 [INFO] [stdout] | [INFO] [stdout] 20 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/chapters/ch4_2.rs:21:7 [INFO] [stdout] | [INFO] [stdout] 21 | let r2 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/chapters/ch4_2.rs:30:9 [INFO] [stdout] | [INFO] [stdout] 30 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/chapters/ch4_2.rs:33:7 [INFO] [stdout] | [INFO] [stdout] 33 | let r2 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/chapters/ch4_2.rs:38:7 [INFO] [stdout] | [INFO] [stdout] 38 | let r1 = &s; // no problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/chapters/ch4_2.rs:39:7 [INFO] [stdout] | [INFO] [stdout] 39 | let r2 = &s; // no problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/chapters/ch4_2.rs:36:7 [INFO] [stdout] | [INFO] [stdout] 36 | let mut s = String::from("hello"); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/chapters/ch4_3.rs:12:7 [INFO] [stdout] | [INFO] [stdout] 12 | let slice = &s[0..2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/chapters/ch4_3.rs:13:7 [INFO] [stdout] | [INFO] [stdout] 13 | let slice = &s[..2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/chapters/ch4_3.rs:16:7 [INFO] [stdout] | [INFO] [stdout] 16 | let mut text2 = String::from("hello_world"); [INFO] [stdout] | ----^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user1` [INFO] [stdout] --> src/chapters/ch5_1.rs:13:7 [INFO] [stdout] | [INFO] [stdout] 13 | let user1 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user3` [INFO] [stdout] --> src/chapters/ch5_1.rs:24:7 [INFO] [stdout] | [INFO] [stdout] 24 | let user3 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `black` [INFO] [stdout] --> src/chapters/ch5_1.rs:31:7 [INFO] [stdout] | [INFO] [stdout] 31 | let black = Color(0, 0, 0); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_black` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `origin` [INFO] [stdout] --> src/chapters/ch5_1.rs:32:7 [INFO] [stdout] | [INFO] [stdout] 32 | let origin = Point(0, 0, 0); [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `rect4` [INFO] [stdout] --> src/chapters/ch5_3.rs:38:7 [INFO] [stdout] | [INFO] [stdout] 38 | let rect4 = Rectangle::square(100); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect4` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `four` [INFO] [stdout] --> src/chapters/ch6_1.rs:43:7 [INFO] [stdout] | [INFO] [stdout] 43 | let four = IpAddrKind::V4; [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_four` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six` [INFO] [stdout] --> src/chapters/ch6_1.rs:44:7 [INFO] [stdout] | [INFO] [stdout] 44 | let six = IpAddrKind::V6; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_six` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `home` [INFO] [stdout] --> src/chapters/ch6_1.rs:47:7 [INFO] [stdout] | [INFO] [stdout] 47 | let home = IpAddr { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_home` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `loopback` [INFO] [stdout] --> src/chapters/ch6_1.rs:52:7 [INFO] [stdout] | [INFO] [stdout] 52 | let loopback = IpAddr { [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `home` [INFO] [stdout] --> src/chapters/ch6_1.rs:58:7 [INFO] [stdout] | [INFO] [stdout] 58 | let home = IpAddr2::V4(String::from("127.0.0.1")); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_home` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `loopback` [INFO] [stdout] --> src/chapters/ch6_1.rs:60:7 [INFO] [stdout] | [INFO] [stdout] 60 | let loopback = IpAddr2::V6(String::from("::1")); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `home` [INFO] [stdout] --> src/chapters/ch6_1.rs:63:7 [INFO] [stdout] | [INFO] [stdout] 63 | let home = IpAddr3::V4(127, 0, 0, 1); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_home` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `loopback` [INFO] [stdout] --> src/chapters/ch6_1.rs:65:7 [INFO] [stdout] | [INFO] [stdout] 65 | let loopback = IpAddr3::V6(String::from("::1")); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `some_number` [INFO] [stdout] --> src/chapters/ch6_1.rs:68:7 [INFO] [stdout] | [INFO] [stdout] 68 | let some_number = Some(5); [INFO] [stdout] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_number` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `some_string` [INFO] [stdout] --> src/chapters/ch6_1.rs:69:7 [INFO] [stdout] | [INFO] [stdout] 69 | let some_string = Some("a string"); [INFO] [stdout] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `absent_number` [INFO] [stdout] --> src/chapters/ch6_1.rs:71:7 [INFO] [stdout] | [INFO] [stdout] 71 | let absent_number: Option = None; [INFO] [stdout] | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_absent_number` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `cents` [INFO] [stdout] --> src/chapters/ch6_2.rs:18:7 [INFO] [stdout] | [INFO] [stdout] 18 | let cents = value_in_cents(Coin::Quarter(UsState::Alabama)); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_cents` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six` [INFO] [stdout] --> src/chapters/ch6_2.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let six = plus_one(five); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_six` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `none` [INFO] [stdout] --> src/chapters/ch6_2.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let none = plus_one(None); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_none` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/chapters/ch8_1.rs:16:7 [INFO] [stdout] | [INFO] [stdout] 16 | let v = vec![1, 2, 3]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `third` [INFO] [stdout] --> src/chapters/ch8_1.rs:21:7 [INFO] [stdout] | [INFO] [stdout] 21 | let third: &i32 = &v[2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_third` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `third` [INFO] [stdout] --> src/chapters/ch8_1.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let third: Option<&i32> = v.get(2); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_third` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `SpreadsheetCell` [INFO] [stdout] --> src/chapters/ch8_1.rs:33:15 [INFO] [stdout] | [INFO] [stdout] 33 | if let Some(SpreadsheetCell) = third { [INFO] [stdout] | ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_SpreadsheetCell` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s3` [INFO] [stdout] --> src/chapters/ch8_2.rs:16:7 [INFO] [stdout] | [INFO] [stdout] 16 | let s3 = s1 + &s2; // s1はムーブされ、もう使用できないことに注意 [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/chapters/ch8_2.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `len` [INFO] [stdout] --> src/chapters/ch8_2.rs:26:7 [INFO] [stdout] | [INFO] [stdout] 26 | let len = String::from("Hola").len(); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `len` [INFO] [stdout] --> src/chapters/ch8_2.rs:29:7 [INFO] [stdout] | [INFO] [stdout] 29 | let len = String::from("Здравствуйте").len(); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/chapters/ch8_2.rs:34:7 [INFO] [stdout] | [INFO] [stdout] 34 | let s = &hello[0..4]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `username`, `email`, `sign_in_count`, and `active` are never read [INFO] [stdout] --> src/chapters/ch5_1.rs:3:3 [INFO] [stdout] | [INFO] [stdout] 2 | struct User { [INFO] [stdout] | ---- fields in this struct [INFO] [stdout] 3 | username: String, [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] 4 | email: String, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 5 | sign_in_count: u64, [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] 6 | active: bool, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `0`, `1`, and `2` are never read [INFO] [stdout] --> src/chapters/ch5_1.rs:9:14 [INFO] [stdout] | [INFO] [stdout] 9 | struct Color(i32, i32, i32); [INFO] [stdout] | ----- ^^^ ^^^ ^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing these fields [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `0`, `1`, and `2` are never read [INFO] [stdout] --> src/chapters/ch5_1.rs:10:14 [INFO] [stdout] | [INFO] [stdout] 10 | struct Point(i32, i32, i32); [INFO] [stdout] | ----- ^^^ ^^^ ^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this struct [INFO] [stdout] | [INFO] [stdout] = help: consider removing these fields [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `kind` and `address` are never read [INFO] [stdout] --> src/chapters/ch6_1.rs:8:3 [INFO] [stdout] | [INFO] [stdout] 7 | struct IpAddr { [INFO] [stdout] | ------ fields in this struct [INFO] [stdout] 8 | kind: IpAddrKind, [INFO] [stdout] | ^^^^ [INFO] [stdout] 9 | address: String, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch6_1.rs:14:6 [INFO] [stdout] | [INFO] [stdout] 14 | V4(String), [INFO] [stdout] | -- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 14 - V4(String), [INFO] [stdout] 14 + V4(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch6_1.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | V6(String), [INFO] [stdout] | -- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 15 - V6(String), [INFO] [stdout] 15 + V6(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read [INFO] [stdout] --> src/chapters/ch6_1.rs:19:6 [INFO] [stdout] | [INFO] [stdout] 19 | V4(u8, u8, u8, u8), [INFO] [stdout] | -- ^^ ^^ ^^ ^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields [INFO] [stdout] | [INFO] [stdout] 19 - V4(u8, u8, u8, u8), [INFO] [stdout] 19 + V4((), (), (), ()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch6_1.rs:20:6 [INFO] [stdout] | [INFO] [stdout] 20 | V6(String), [INFO] [stdout] | -- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 20 - V6(String), [INFO] [stdout] 20 + V6(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum `Message` is never used [INFO] [stdout] --> src/chapters/ch6_1.rs:24:6 [INFO] [stdout] | [INFO] [stdout] 24 | enum Message { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `call` is never used [INFO] [stdout] --> src/chapters/ch6_1.rs:32:6 [INFO] [stdout] | [INFO] [stdout] 31 | impl Message { [INFO] [stdout] | ------------ method in this implementation [INFO] [stdout] 32 | fn call(&self) { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant `Alaska` is never constructed [INFO] [stdout] --> src/chapters/ch6_2.rs:5:5 [INFO] [stdout] | [INFO] [stdout] 3 | enum UsState { [INFO] [stdout] | ------- variant in this enum [INFO] [stdout] 4 | Alabama, [INFO] [stdout] 5 | Alaska, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed [INFO] [stdout] --> src/chapters/ch6_2.rs:10:3 [INFO] [stdout] | [INFO] [stdout] 9 | enum Coin { [INFO] [stdout] | ---- variants in this enum [INFO] [stdout] 10 | Penny, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 11 | Nickel, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] 12 | Dime, [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch8_1.rs:3:7 [INFO] [stdout] | [INFO] [stdout] 3 | Int(i32), [INFO] [stdout] | --- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 3 - Int(i32), [INFO] [stdout] 3 + Int(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch8_1.rs:4:9 [INFO] [stdout] | [INFO] [stdout] 4 | Float(f64), [INFO] [stdout] | ----- ^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 4 - Float(f64), [INFO] [stdout] 4 + Float(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/chapters/ch8_1.rs:5:8 [INFO] [stdout] | [INFO] [stdout] 5 | Text(String), [INFO] [stdout] | ---- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this variant [INFO] [stdout] | [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 5 - Text(String), [INFO] [stdout] 5 + Text(()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `summarize_author` is never used [INFO] [stdout] --> src/chapters/ch10_2.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 1 | pub trait Summary { [INFO] [stdout] | ------- method in this trait [INFO] [stdout] ... [INFO] [stdout] 7 | fn summarize_author(&self) -> String; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `content` is never read [INFO] [stdout] --> src/chapters/ch10_2.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 18 | pub struct NewsArticle { [INFO] [stdout] | ----------- field in this struct [INFO] [stdout] ... [INFO] [stdout] 22 | pub content: String, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `reply` and `retweet` are never read [INFO] [stdout] --> src/chapters/ch10_2.rs:41:7 [INFO] [stdout] | [INFO] [stdout] 38 | pub struct Tweet { [INFO] [stdout] | ----- fields in this struct [INFO] [stdout] ... [INFO] [stdout] 41 | pub reply: bool, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 42 | pub retweet: bool, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `notify_syntax_sugar` is never used [INFO] [stdout] --> src/chapters/ch10_2.rs:108:8 [INFO] [stdout] | [INFO] [stdout] 108 | pub fn notify_syntax_sugar(item: &T) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `notify_multi_trait` is never used [INFO] [stdout] --> src/chapters/ch10_2.rs:113:8 [INFO] [stdout] | [INFO] [stdout] 113 | pub fn notify_multi_trait(item: &(impl Summary + Display)) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `SpreadsheetCell` should have a snake case name [INFO] [stdout] --> src/chapters/ch8_1.rs:33:15 [INFO] [stdout] | [INFO] [stdout] 33 | if let Some(SpreadsheetCell) = third { [INFO] [stdout] | ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `spreadsheet_cell` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `test` profile [unoptimized + debuginfo] target(s) in 0.63s [INFO] running `Command { std: "docker" "inspect" "c6f27af46493c69bfb143de8334aedd5e4059bbdcaf2b2928ef43fafd5624c9d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c6f27af46493c69bfb143de8334aedd5e4059bbdcaf2b2928ef43fafd5624c9d", kill_on_drop: false }` [INFO] [stdout] c6f27af46493c69bfb143de8334aedd5e4059bbdcaf2b2928ef43fafd5624c9d [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "test" "--frozen" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }` [INFO] [stdout] 361c2b4e4ac0e43bbaa253675e887d80aff519655e6d18fd48e503c588bf91e8 [INFO] running `Command { std: "docker" "start" "-a" "361c2b4e4ac0e43bbaa253675e887d80aff519655e6d18fd48e503c588bf91e8", kill_on_drop: false }` [INFO] [stderr] warning: unused import: `std::io::ErrorKind` [INFO] [stderr] --> src/chapters/ch9_2.rs:2:5 [INFO] [stderr] | [INFO] [stderr] 2 | use std::io::ErrorKind; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `guess` [INFO] [stderr] --> src/chapters/ch3_2.rs:4:7 [INFO] [stderr] | [INFO] [stderr] 4 | let guess: u32 = "42".parse().expect("Not a number!"); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/chapters/ch3_2.rs:7:7 [INFO] [stderr] | [INFO] [stderr] 7 | let x = 2.0; // f64 [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/chapters/ch3_2.rs:9:7 [INFO] [stderr] | [INFO] [stderr] 9 | let y: f32 = 3.0; // f32 [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `sum` [INFO] [stderr] --> src/chapters/ch3_2.rs:13:7 [INFO] [stderr] | [INFO] [stderr] 13 | let sum = 5 + 10; [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_sum` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `difference` [INFO] [stderr] --> src/chapters/ch3_2.rs:16:7 [INFO] [stderr] | [INFO] [stderr] 16 | let difference = 95.5 - 4.3; [INFO] [stderr] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difference` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `product` [INFO] [stderr] --> src/chapters/ch3_2.rs:19:7 [INFO] [stderr] | [INFO] [stderr] 19 | let product = 4 * 30; [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_product` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `quotient` [INFO] [stderr] --> src/chapters/ch3_2.rs:22:7 [INFO] [stderr] | [INFO] [stderr] 22 | let quotient = 56.7 / 32.2; [INFO] [stderr] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotient` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `floored` [INFO] [stderr] --> src/chapters/ch3_2.rs:23:7 [INFO] [stderr] | [INFO] [stderr] 23 | let floored = 2 / 3; // Results in 0 [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_floored` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `remainder` [INFO] [stderr] --> src/chapters/ch3_2.rs:26:7 [INFO] [stderr] | [INFO] [stderr] 26 | let remainder = 43 % 5; [INFO] [stderr] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_remainder` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/chapters/ch3_2.rs:29:7 [INFO] [stderr] | [INFO] [stderr] 29 | let t = true; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/chapters/ch3_2.rs:31:7 [INFO] [stderr] | [INFO] [stderr] 31 | let f: bool = false; // with explicit type annotation [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c` [INFO] [stderr] --> src/chapters/ch3_2.rs:34:7 [INFO] [stderr] | [INFO] [stderr] 34 | let c = 'z'; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `z` [INFO] [stderr] --> src/chapters/ch3_2.rs:35:7 [INFO] [stderr] | [INFO] [stderr] 35 | let z = 'ℤ'; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `heart_eyed_cat` [INFO] [stderr] --> src/chapters/ch3_2.rs:36:7 [INFO] [stderr] | [INFO] [stderr] 36 | let heart_eyed_cat = '😻'; [INFO] [stderr] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heart_eyed_cat` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `five_hundred` [INFO] [stderr] --> src/chapters/ch3_2.rs:41:7 [INFO] [stderr] | [INFO] [stderr] 41 | let five_hundred = tup.0; [INFO] [stderr] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_five_hundred` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `six_point_four` [INFO] [stderr] --> src/chapters/ch3_2.rs:43:7 [INFO] [stderr] | [INFO] [stderr] 43 | let six_point_four = tup.1; [INFO] [stderr] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_six_point_four` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `one` [INFO] [stderr] --> src/chapters/ch3_2.rs:45:7 [INFO] [stderr] | [INFO] [stderr] 45 | let one = tup.2; [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_one` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `a` [INFO] [stderr] --> src/chapters/ch3_2.rs:48:7 [INFO] [stderr] | [INFO] [stderr] 48 | let a = [1, 2, 3, 4, 5]; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `months` [INFO] [stderr] --> src/chapters/ch3_2.rs:50:7 [INFO] [stderr] | [INFO] [stderr] 50 | let months = ["January", "February", "March", "April", "May", "June", "July","August", "September", "October", "November", "December"]; [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_months` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `a` [INFO] [stderr] --> src/chapters/ch3_2.rs:52:7 [INFO] [stderr] | [INFO] [stderr] 52 | let a: [i32; 5] = [1, 2, 3, 4, 5]; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/chapters/ch3_3.rs:9:7 [INFO] [stderr] | [INFO] [stderr] 9 | let y = 6; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `lucky_number` [INFO] [stderr] --> src/chapters/ch3_4.rs:9:7 [INFO] [stderr] | [INFO] [stderr] 9 | let lucky_number = 7; // I’m feeling lucky today [INFO] [stderr] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lucky_number` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `lucky_number` [INFO] [stderr] --> src/chapters/ch3_4.rs:12:7 [INFO] [stderr] | [INFO] [stderr] 12 | let lucky_number = 7; [INFO] [stderr] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lucky_number` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/chapters/ch4_1.rs:12:7 [INFO] [stderr] | [INFO] [stderr] 12 | let s = "hello"; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/chapters/ch4_1.rs:23:7 [INFO] [stderr] | [INFO] [stderr] 23 | let y = x; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s2` [INFO] [stderr] --> src/chapters/ch4_1.rs:33:7 [INFO] [stderr] | [INFO] [stderr] 33 | let s2 = s1.clone(); [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s1` [INFO] [stderr] --> src/chapters/ch4_1.rs:38:7 [INFO] [stderr] | [INFO] [stderr] 38 | let s1 = gives_ownership(); // gives_ownership moves its return [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s3` [INFO] [stderr] --> src/chapters/ch4_1.rs:42:7 [INFO] [stderr] | [INFO] [stderr] 42 | let s3 = takes_and_gives_back(s2); // s2 is moved into [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/chapters/ch4_2.rs:20:7 [INFO] [stderr] | [INFO] [stderr] 20 | let r1 = &mut s; [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/chapters/ch4_2.rs:21:7 [INFO] [stderr] | [INFO] [stderr] 21 | let r2 = &mut s; [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/chapters/ch4_2.rs:30:9 [INFO] [stderr] | [INFO] [stderr] 30 | let r1 = &mut s; [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/chapters/ch4_2.rs:33:7 [INFO] [stderr] | [INFO] [stderr] 33 | let r2 = &mut s; [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/chapters/ch4_2.rs:38:7 [INFO] [stderr] | [INFO] [stderr] 38 | let r1 = &s; // no problem [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/chapters/ch4_2.rs:39:7 [INFO] [stderr] | [INFO] [stderr] 39 | let r2 = &s; // no problem [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/chapters/ch4_2.rs:36:7 [INFO] [stderr] | [INFO] [stderr] 36 | let mut s = String::from("hello"); [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/chapters/ch4_3.rs:12:7 [INFO] [stderr] | [INFO] [stderr] 12 | let slice = &s[0..2]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/chapters/ch4_3.rs:13:7 [INFO] [stderr] | [INFO] [stderr] 13 | let slice = &s[..2]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/chapters/ch4_3.rs:16:7 [INFO] [stderr] | [INFO] [stderr] 16 | let mut text2 = String::from("hello_world"); [INFO] [stderr] | ----^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `user1` [INFO] [stderr] --> src/chapters/ch5_1.rs:13:7 [INFO] [stderr] | [INFO] [stderr] 13 | let user1 = User { [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `user3` [INFO] [stderr] --> src/chapters/ch5_1.rs:24:7 [INFO] [stderr] | [INFO] [stderr] 24 | let user3 = User { [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `black` [INFO] [stderr] --> src/chapters/ch5_1.rs:31:7 [INFO] [stderr] | [INFO] [stderr] 31 | let black = Color(0, 0, 0); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_black` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `origin` [INFO] [stderr] --> src/chapters/ch5_1.rs:32:7 [INFO] [stderr] | [INFO] [stderr] 32 | let origin = Point(0, 0, 0); [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `rect4` [INFO] [stderr] --> src/chapters/ch5_3.rs:38:7 [INFO] [stderr] | [INFO] [stderr] 38 | let rect4 = Rectangle::square(100); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect4` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `four` [INFO] [stderr] --> src/chapters/ch6_1.rs:43:7 [INFO] [stderr] | [INFO] [stderr] 43 | let four = IpAddrKind::V4; [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_four` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `six` [INFO] [stderr] --> src/chapters/ch6_1.rs:44:7 [INFO] [stderr] | [INFO] [stderr] 44 | let six = IpAddrKind::V6; [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_six` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `home` [INFO] [stderr] --> src/chapters/ch6_1.rs:47:7 [INFO] [stderr] | [INFO] [stderr] 47 | let home = IpAddr { [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_home` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `loopback` [INFO] [stderr] --> src/chapters/ch6_1.rs:52:7 [INFO] [stderr] | [INFO] [stderr] 52 | let loopback = IpAddr { [INFO] [stderr] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `home` [INFO] [stderr] --> src/chapters/ch6_1.rs:58:7 [INFO] [stderr] | [INFO] [stderr] 58 | let home = IpAddr2::V4(String::from("127.0.0.1")); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_home` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `loopback` [INFO] [stderr] --> src/chapters/ch6_1.rs:60:7 [INFO] [stderr] | [INFO] [stderr] 60 | let loopback = IpAddr2::V6(String::from("::1")); [INFO] [stderr] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `home` [INFO] [stderr] --> src/chapters/ch6_1.rs:63:7 [INFO] [stderr] | [INFO] [stderr] 63 | let home = IpAddr3::V4(127, 0, 0, 1); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_home` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `loopback` [INFO] [stderr] --> src/chapters/ch6_1.rs:65:7 [INFO] [stderr] | [INFO] [stderr] 65 | let loopback = IpAddr3::V6(String::from("::1")); [INFO] [stderr] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `some_number` [INFO] [stderr] --> src/chapters/ch6_1.rs:68:7 [INFO] [stderr] | [INFO] [stderr] 68 | let some_number = Some(5); [INFO] [stderr] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_number` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `some_string` [INFO] [stderr] --> src/chapters/ch6_1.rs:69:7 [INFO] [stderr] | [INFO] [stderr] 69 | let some_string = Some("a string"); [INFO] [stderr] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `absent_number` [INFO] [stderr] --> src/chapters/ch6_1.rs:71:7 [INFO] [stderr] | [INFO] [stderr] 71 | let absent_number: Option = None; [INFO] [stderr] | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_absent_number` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `cents` [INFO] [stderr] --> src/chapters/ch6_2.rs:18:7 [INFO] [stderr] | [INFO] [stderr] 18 | let cents = value_in_cents(Coin::Quarter(UsState::Alabama)); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_cents` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `six` [INFO] [stderr] --> src/chapters/ch6_2.rs:22:7 [INFO] [stderr] | [INFO] [stderr] 22 | let six = plus_one(five); [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_six` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `none` [INFO] [stderr] --> src/chapters/ch6_2.rs:23:7 [INFO] [stderr] | [INFO] [stderr] 23 | let none = plus_one(None); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_none` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `v` [INFO] [stderr] --> src/chapters/ch8_1.rs:16:7 [INFO] [stderr] | [INFO] [stderr] 16 | let v = vec![1, 2, 3]; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `third` [INFO] [stderr] --> src/chapters/ch8_1.rs:21:7 [INFO] [stderr] | [INFO] [stderr] 21 | let third: &i32 = &v[2]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_third` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `third` [INFO] [stderr] --> src/chapters/ch8_1.rs:22:7 [INFO] [stderr] | [INFO] [stderr] 22 | let third: Option<&i32> = v.get(2); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_third` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `SpreadsheetCell` [INFO] [stderr] --> src/chapters/ch8_1.rs:33:15 [INFO] [stderr] | [INFO] [stderr] 33 | if let Some(SpreadsheetCell) = third { [INFO] [stderr] | ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_SpreadsheetCell` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s3` [INFO] [stderr] --> src/chapters/ch8_2.rs:16:7 [INFO] [stderr] | [INFO] [stderr] 16 | let s3 = s1 + &s2; // s1はムーブされ、もう使用できないことに注意 [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/chapters/ch8_2.rs:23:7 [INFO] [stderr] | [INFO] [stderr] 23 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `len` [INFO] [stderr] --> src/chapters/ch8_2.rs:26:7 [INFO] [stderr] | [INFO] [stderr] 26 | let len = String::from("Hola").len(); [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `len` [INFO] [stderr] --> src/chapters/ch8_2.rs:29:7 [INFO] [stderr] | [INFO] [stderr] 29 | let len = String::from("Здравствуйте").len(); [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/chapters/ch8_2.rs:34:7 [INFO] [stderr] | [INFO] [stderr] 34 | let s = &hello[0..4]; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: fields `username`, `email`, `sign_in_count`, and `active` are never read [INFO] [stderr] --> src/chapters/ch5_1.rs:3:3 [INFO] [stderr] | [INFO] [stderr] 2 | struct User { [INFO] [stderr] | ---- fields in this struct [INFO] [stderr] 3 | username: String, [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] 4 | email: String, [INFO] [stderr] | ^^^^^ [INFO] [stderr] 5 | sign_in_count: u64, [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] 6 | active: bool, [INFO] [stderr] | ^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: fields `0`, `1`, and `2` are never read [INFO] [stderr] --> src/chapters/ch5_1.rs:9:14 [INFO] [stderr] | [INFO] [stderr] 9 | struct Color(i32, i32, i32); [INFO] [stderr] | ----- ^^^ ^^^ ^^^ [INFO] [stderr] | | [INFO] [stderr] | fields in this struct [INFO] [stderr] | [INFO] [stderr] = help: consider removing these fields [INFO] [stderr] [INFO] [stderr] warning: fields `0`, `1`, and `2` are never read [INFO] [stderr] --> src/chapters/ch5_1.rs:10:14 [INFO] [stderr] | [INFO] [stderr] 10 | struct Point(i32, i32, i32); [INFO] [stderr] | ----- ^^^ ^^^ ^^^ [INFO] [stderr] | | [INFO] [stderr] | fields in this struct [INFO] [stderr] | [INFO] [stderr] = help: consider removing these fields [INFO] [stderr] [INFO] [stderr] warning: fields `kind` and `address` are never read [INFO] [stderr] --> src/chapters/ch6_1.rs:8:3 [INFO] [stderr] | [INFO] [stderr] 7 | struct IpAddr { [INFO] [stderr] | ------ fields in this struct [INFO] [stderr] 8 | kind: IpAddrKind, [INFO] [stderr] | ^^^^ [INFO] [stderr] 9 | address: String, [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field `0` is never read [INFO] [stderr] --> src/chapters/ch6_1.rs:14:6 [INFO] [stderr] | [INFO] [stderr] 14 | V4(String), [INFO] [stderr] | -- ^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | field in this variant [INFO] [stderr] | [INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stderr] | [INFO] [stderr] 14 - V4(String), [INFO] [stderr] 14 + V4(()), [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: field `0` is never read [INFO] [stderr] --> src/chapters/ch6_1.rs:15:6 [INFO] [stderr] | [INFO] [stderr] 15 | V6(String), [INFO] [stderr] | -- ^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | field in this variant [INFO] [stderr] | [INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stderr] | [INFO] [stderr] 15 - V6(String), [INFO] [stderr] 15 + V6(()), [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: fields `0`, `1`, `2`, and `3` are never read [INFO] [stderr] --> src/chapters/ch6_1.rs:19:6 [INFO] [stderr] | [INFO] [stderr] 19 | V4(u8, u8, u8, u8), [INFO] [stderr] | -- ^^ ^^ ^^ ^^ [INFO] [stderr] | | [INFO] [stderr] | fields in this variant [INFO] [stderr] | [INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields [INFO] [stderr] | [INFO] [stderr] 19 - V4(u8, u8, u8, u8), [INFO] [stderr] 19 + V4((), (), (), ()), [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: field `0` is never read [INFO] [stderr] --> src/chapters/ch6_1.rs:20:6 [INFO] [stderr] | [INFO] [stderr] 20 | V6(String), [INFO] [stderr] | -- ^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | field in this variant [INFO] [stderr] | [INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stderr] | [INFO] [stderr] 20 - V6(String), [INFO] [stderr] 20 + V6(()), [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: enum `Message` is never used [INFO] [stderr] --> src/chapters/ch6_1.rs:24:6 [INFO] [stderr] | [INFO] [stderr] 24 | enum Message { [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method `call` is never used [INFO] [stderr] --> src/chapters/ch6_1.rs:32:6 [INFO] [stderr] | [INFO] [stderr] 31 | impl Message { [INFO] [stderr] | ------------ method in this implementation [INFO] [stderr] 32 | fn call(&self) { [INFO] [stderr] | ^^^^ [INFO] [stderr] [INFO] [stderr] warning: variant `Alaska` is never constructed [INFO] [stderr] --> src/chapters/ch6_2.rs:5:5 [INFO] [stderr] | [INFO] [stderr] 3 | enum UsState { [INFO] [stderr] | ------- variant in this enum [INFO] [stderr] 4 | Alabama, [INFO] [stderr] 5 | Alaska, [INFO] [stderr] | ^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stderr] [INFO] [stderr] warning: variants `Penny`, `Nickel`, and `Dime` are never constructed [INFO] [stderr] --> src/chapters/ch6_2.rs:10:3 [INFO] [stderr] | [INFO] [stderr] 9 | enum Coin { [INFO] [stderr] | ---- variants in this enum [INFO] [stderr] 10 | Penny, [INFO] [stderr] | ^^^^^ [INFO] [stderr] 11 | Nickel, [INFO] [stderr] | ^^^^^^ [INFO] [stderr] 12 | Dime, [INFO] [stderr] | ^^^^ [INFO] [stderr] [INFO] [stderr] warning: field `0` is never read [INFO] [stderr] --> src/chapters/ch8_1.rs:3:7 [INFO] [stderr] | [INFO] [stderr] 3 | Int(i32), [INFO] [stderr] | --- ^^^ [INFO] [stderr] | | [INFO] [stderr] | field in this variant [INFO] [stderr] | [INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stderr] | [INFO] [stderr] 3 - Int(i32), [INFO] [stderr] 3 + Int(()), [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: field `0` is never read [INFO] [stderr] --> src/chapters/ch8_1.rs:4:9 [INFO] [stderr] | [INFO] [stderr] 4 | Float(f64), [INFO] [stderr] | ----- ^^^ [INFO] [stderr] | | [INFO] [stderr] | field in this variant [INFO] [stderr] | [INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stderr] | [INFO] [stderr] 4 - Float(f64), [INFO] [stderr] 4 + Float(()), [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: field `0` is never read [INFO] [stderr] --> src/chapters/ch8_1.rs:5:8 [INFO] [stderr] | [INFO] [stderr] 5 | Text(String), [INFO] [stderr] | ---- ^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | field in this variant [INFO] [stderr] | [INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stderr] | [INFO] [stderr] 5 - Text(String), [INFO] [stderr] 5 + Text(()), [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: method `summarize_author` is never used [INFO] [stderr] --> src/chapters/ch10_2.rs:7:6 [INFO] [stderr] | [INFO] [stderr] 1 | pub trait Summary { [INFO] [stderr] | ------- method in this trait [INFO] [stderr] ... [INFO] [stderr] 7 | fn summarize_author(&self) -> String; [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field `content` is never read [INFO] [stderr] --> src/chapters/ch10_2.rs:22:7 [INFO] [stderr] | [INFO] [stderr] 18 | pub struct NewsArticle { [INFO] [stderr] | ----------- field in this struct [INFO] [stderr] ... [INFO] [stderr] 22 | pub content: String, [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: fields `reply` and `retweet` are never read [INFO] [stderr] --> src/chapters/ch10_2.rs:41:7 [INFO] [stderr] | [INFO] [stderr] 38 | pub struct Tweet { [INFO] [stderr] | ----- fields in this struct [INFO] [stderr] ... [INFO] [stderr] 41 | pub reply: bool, [INFO] [stderr] | ^^^^^ [INFO] [stderr] 42 | pub retweet: bool, [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function `notify_syntax_sugar` is never used [INFO] [stderr] --> src/chapters/ch10_2.rs:108:8 [INFO] [stderr] | [INFO] [stderr] 108 | pub fn notify_syntax_sugar(item: &T) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function `notify_multi_trait` is never used [INFO] [stderr] --> src/chapters/ch10_2.rs:113:8 [INFO] [stderr] | [INFO] [stderr] 113 | pub fn notify_multi_trait(item: &(impl Summary + Display)) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: variable `SpreadsheetCell` should have a snake case name [INFO] [stderr] --> src/chapters/ch8_1.rs:33:15 [INFO] [stderr] | [INFO] [stderr] 33 | if let Some(SpreadsheetCell) = third { [INFO] [stderr] | ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `spreadsheet_cell` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(non_snake_case)]` on by default [INFO] [stderr] [INFO] [stderr] warning: `rust-learn` (bin "rust-learn" test) generated 88 warnings (run `cargo fix --bin "rust-learn" --tests` to apply 3 suggestions) [INFO] [stderr] Finished `test` profile [unoptimized + debuginfo] target(s) in 0.07s [INFO] [stderr] Running unittests src/main.rs (/opt/rustwide/target/x86_64-unknown-linux-musl/debug/deps/rust_learn-76c61e74cd495591) [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "361c2b4e4ac0e43bbaa253675e887d80aff519655e6d18fd48e503c588bf91e8", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "361c2b4e4ac0e43bbaa253675e887d80aff519655e6d18fd48e503c588bf91e8", kill_on_drop: false }` [INFO] [stdout] 361c2b4e4ac0e43bbaa253675e887d80aff519655e6d18fd48e503c588bf91e8