[INFO] cloning repository https://github.com/arunkumar413/RustProgrammingNotes [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/arunkumar413/RustProgrammingNotes" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farunkumar413%2FRustProgrammingNotes", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farunkumar413%2FRustProgrammingNotes'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] a43890557a0e8542b4609a96e1d6cd0dfd79ba78 [INFO] testing arunkumar413/RustProgrammingNotes against master#62efba8a050c64249dab942951bb28f710208bc8 for pr-90799 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farunkumar413%2FRustProgrammingNotes" "/workspace/builds/worker-11/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/arunkumar413/RustProgrammingNotes on toolchain 62efba8a050c64249dab942951bb28f710208bc8 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/arunkumar413/RustProgrammingNotes [INFO] finished tweaking git repo https://github.com/arunkumar413/RustProgrammingNotes [INFO] tweaked toml for git repo https://github.com/arunkumar413/RustProgrammingNotes written to /workspace/builds/worker-11/source/Cargo.toml [INFO] crate git repo https://github.com/arunkumar413/RustProgrammingNotes already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 22a434eb4863fd37bb0567341ad555b6dcdfb2e23f5976dc1692212233d4df7a [INFO] running `Command { std: "docker" "start" "-a" "22a434eb4863fd37bb0567341ad555b6dcdfb2e23f5976dc1692212233d4df7a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "22a434eb4863fd37bb0567341ad555b6dcdfb2e23f5976dc1692212233d4df7a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "22a434eb4863fd37bb0567341ad555b6dcdfb2e23f5976dc1692212233d4df7a", kill_on_drop: false }` [INFO] [stdout] 22a434eb4863fd37bb0567341ad555b6dcdfb2e23f5976dc1692212233d4df7a [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 69e291b7661fb0a78b89242db15a3e1b311902ad4d7208145191ebdeef43d769 [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "69e291b7661fb0a78b89242db15a3e1b311902ad4d7208145191ebdeef43d769", kill_on_drop: false }` [INFO] [stderr] Compiling hello_world v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `myvar1` [INFO] [stdout] --> src/main.rs:6:9 [INFO] [stdout] | [INFO] [stdout] 6 | let myvar1 = 1; // non mutable variable. By default uses i32 bit [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_myvar1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `myvar2` [INFO] [stdout] --> src/main.rs:7:13 [INFO] [stdout] | [INFO] [stdout] 7 | let mut myvar2 = 2; // To make a variable mutable we use the key word mut. By default uses i32 [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_myvar2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:30:9 [INFO] [stdout] | [INFO] [stdout] 30 | let i = true; // without type annotation annotation [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `j` [INFO] [stdout] --> src/main.rs:31:9 [INFO] [stdout] | [INFO] [stdout] 31 | let j: bool = false; // with explicit type annotation [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_j` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `mychar1` [INFO] [stdout] --> src/main.rs:35:9 [INFO] [stdout] | [INFO] [stdout] 35 | let mychar1 = 'z'; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mychar1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `mychar2` [INFO] [stdout] --> src/main.rs:36:9 [INFO] [stdout] | [INFO] [stdout] 36 | let mychar2 = 'ℤ'; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mychar2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `heart_eyed_cat` [INFO] [stdout] --> src/main.rs:37:9 [INFO] [stdout] | [INFO] [stdout] 37 | 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: `tup_2` [INFO] [stdout] --> src/main.rs:42:9 [INFO] [stdout] | [INFO] [stdout] 42 | let tup_2: (i32, f64, u8) = (500, 6.4, 1); // with type annotation. Typle values can be accessed using the dot operator [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_tup_2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/main.rs:43:13 [INFO] [stdout] | [INFO] [stdout] 43 | let (x, y, z) = tup_1; // access tuple values using destructing [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/main.rs:43:16 [INFO] [stdout] | [INFO] [stdout] 43 | let (x, y, z) = tup_1; // access tuple values using destructing [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `myarr1` [INFO] [stdout] --> src/main.rs:47:9 [INFO] [stdout] | [INFO] [stdout] 47 | let myarr1 = [1, 2, 3, 4, 5]; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_myarr1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `arr2` [INFO] [stdout] --> src/main.rs:48:9 [INFO] [stdout] | [INFO] [stdout] 48 | let arr2: [i32; 5] = [1, 2, 3, 4, 5]; // An array of i32 bit type and length of 5. [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_arr2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `arr3` [INFO] [stdout] --> src/main.rs:49:9 [INFO] [stdout] | [INFO] [stdout] 49 | let arr3 = [3; 5]; // Array of length 5 with the initial values 3. Which is similar to [3,3,3,3,3,] [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_arr3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:7:9 [INFO] [stdout] | [INFO] [stdout] 7 | let mut myvar2 = 2; // To make a variable mutable we use the key word mut. By default uses i32 [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: constant is never used: `MAX_POINTS` [INFO] [stdout] --> src/main.rs:26:5 [INFO] [stdout] | [INFO] [stdout] 26 | const MAX_POINTS: u32 = 100_000; // used throughtout the program. Use only uppercase with underscore. Always immutable. Can't use the... [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 15 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1.14s [INFO] running `Command { std: "docker" "inspect" "69e291b7661fb0a78b89242db15a3e1b311902ad4d7208145191ebdeef43d769", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "69e291b7661fb0a78b89242db15a3e1b311902ad4d7208145191ebdeef43d769", kill_on_drop: false }` [INFO] [stdout] 69e291b7661fb0a78b89242db15a3e1b311902ad4d7208145191ebdeef43d769 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] ba30a0b5bb69f391cf9976fa0fae637d805f8d651f5d4d5bef0e2927d8d702bb [INFO] running `Command { std: "docker" "start" "-a" "ba30a0b5bb69f391cf9976fa0fae637d805f8d651f5d4d5bef0e2927d8d702bb", kill_on_drop: false }` [INFO] [stderr] Compiling hello_world v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `myvar1` [INFO] [stdout] --> src/main.rs:6:9 [INFO] [stdout] | [INFO] [stdout] 6 | let myvar1 = 1; // non mutable variable. By default uses i32 bit [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_myvar1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `myvar2` [INFO] [stdout] --> src/main.rs:7:13 [INFO] [stdout] | [INFO] [stdout] 7 | let mut myvar2 = 2; // To make a variable mutable we use the key word mut. By default uses i32 [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_myvar2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:30:9 [INFO] [stdout] | [INFO] [stdout] 30 | let i = true; // without type annotation annotation [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `j` [INFO] [stdout] --> src/main.rs:31:9 [INFO] [stdout] | [INFO] [stdout] 31 | let j: bool = false; // with explicit type annotation [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_j` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `mychar1` [INFO] [stdout] --> src/main.rs:35:9 [INFO] [stdout] | [INFO] [stdout] 35 | let mychar1 = 'z'; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mychar1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `mychar2` [INFO] [stdout] --> src/main.rs:36:9 [INFO] [stdout] | [INFO] [stdout] 36 | let mychar2 = 'ℤ'; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mychar2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `heart_eyed_cat` [INFO] [stdout] --> src/main.rs:37:9 [INFO] [stdout] | [INFO] [stdout] 37 | 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: `tup_2` [INFO] [stdout] --> src/main.rs:42:9 [INFO] [stdout] | [INFO] [stdout] 42 | let tup_2: (i32, f64, u8) = (500, 6.4, 1); // with type annotation. Typle values can be accessed using the dot operator [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_tup_2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/main.rs:43:13 [INFO] [stdout] | [INFO] [stdout] 43 | let (x, y, z) = tup_1; // access tuple values using destructing [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/main.rs:43:16 [INFO] [stdout] | [INFO] [stdout] 43 | let (x, y, z) = tup_1; // access tuple values using destructing [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `myarr1` [INFO] [stdout] --> src/main.rs:47:9 [INFO] [stdout] | [INFO] [stdout] 47 | let myarr1 = [1, 2, 3, 4, 5]; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_myarr1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `arr2` [INFO] [stdout] --> src/main.rs:48:9 [INFO] [stdout] | [INFO] [stdout] 48 | let arr2: [i32; 5] = [1, 2, 3, 4, 5]; // An array of i32 bit type and length of 5. [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_arr2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `arr3` [INFO] [stdout] --> src/main.rs:49:9 [INFO] [stdout] | [INFO] [stdout] 49 | let arr3 = [3; 5]; // Array of length 5 with the initial values 3. Which is similar to [3,3,3,3,3,] [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_arr3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:7:9 [INFO] [stdout] | [INFO] [stdout] 7 | let mut myvar2 = 2; // To make a variable mutable we use the key word mut. By default uses i32 [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: 14 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.72s [INFO] running `Command { std: "docker" "inspect" "ba30a0b5bb69f391cf9976fa0fae637d805f8d651f5d4d5bef0e2927d8d702bb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ba30a0b5bb69f391cf9976fa0fae637d805f8d651f5d4d5bef0e2927d8d702bb", kill_on_drop: false }` [INFO] [stdout] ba30a0b5bb69f391cf9976fa0fae637d805f8d651f5d4d5bef0e2927d8d702bb [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 51d66a32bec19e06db0c52dedc9bef2e4795ad94ed48e996b899a0cf02cf2189 [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "51d66a32bec19e06db0c52dedc9bef2e4795ad94ed48e996b899a0cf02cf2189", kill_on_drop: false }` [INFO] [stderr] warning: unused variable: `myvar1` [INFO] [stderr] --> src/main.rs:6:9 [INFO] [stderr] | [INFO] [stderr] 6 | let myvar1 = 1; // non mutable variable. By default uses i32 bit [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_myvar1` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `myvar2` [INFO] [stderr] --> src/main.rs:7:13 [INFO] [stderr] | [INFO] [stderr] 7 | let mut myvar2 = 2; // To make a variable mutable we use the key word mut. By default uses i32 [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_myvar2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:30:9 [INFO] [stderr] | [INFO] [stderr] 30 | let i = true; // without type annotation annotation [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `j` [INFO] [stderr] --> src/main.rs:31:9 [INFO] [stderr] | [INFO] [stderr] 31 | let j: bool = false; // with explicit type annotation [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_j` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `mychar1` [INFO] [stderr] --> src/main.rs:35:9 [INFO] [stderr] | [INFO] [stderr] 35 | let mychar1 = 'z'; [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mychar1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `mychar2` [INFO] [stderr] --> src/main.rs:36:9 [INFO] [stderr] | [INFO] [stderr] 36 | let mychar2 = 'ℤ'; [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mychar2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `heart_eyed_cat` [INFO] [stderr] --> src/main.rs:37:9 [INFO] [stderr] | [INFO] [stderr] 37 | 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: `tup_2` [INFO] [stderr] --> src/main.rs:42:9 [INFO] [stderr] | [INFO] [stderr] 42 | let tup_2: (i32, f64, u8) = (500, 6.4, 1); // with type annotation. Typle values can be accessed using the dot operator [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_tup_2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/main.rs:43:13 [INFO] [stderr] | [INFO] [stderr] 43 | let (x, y, z) = tup_1; // access tuple values using destructing [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `z` [INFO] [stderr] --> src/main.rs:43:16 [INFO] [stderr] | [INFO] [stderr] 43 | let (x, y, z) = tup_1; // access tuple values using destructing [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `myarr1` [INFO] [stderr] --> src/main.rs:47:9 [INFO] [stderr] | [INFO] [stderr] 47 | let myarr1 = [1, 2, 3, 4, 5]; [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_myarr1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `arr2` [INFO] [stderr] --> src/main.rs:48:9 [INFO] [stderr] | [INFO] [stderr] 48 | let arr2: [i32; 5] = [1, 2, 3, 4, 5]; // An array of i32 bit type and length of 5. [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_arr2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `arr3` [INFO] [stderr] --> src/main.rs:49:9 [INFO] [stderr] | [INFO] [stderr] 49 | let arr3 = [3; 5]; // Array of length 5 with the initial values 3. Which is similar to [3,3,3,3,3,] [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_arr3` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:7:9 [INFO] [stderr] | [INFO] [stderr] 7 | let mut myvar2 = 2; // To make a variable mutable we use the key word mut. By default uses i32 [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: `hello_world` (bin "hello_world" test) generated 14 warnings [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.02s [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/hello_world-2683109f6a7c2433) [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" "51d66a32bec19e06db0c52dedc9bef2e4795ad94ed48e996b899a0cf02cf2189", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "51d66a32bec19e06db0c52dedc9bef2e4795ad94ed48e996b899a0cf02cf2189", kill_on_drop: false }` [INFO] [stdout] 51d66a32bec19e06db0c52dedc9bef2e4795ad94ed48e996b899a0cf02cf2189