[INFO] cloning repository https://github.com/donjne/rust_tutorial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/donjne/rust_tutorial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdonjne%2Frust_tutorial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdonjne%2Frust_tutorial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 35b17f4d244e9277af4de28159bf991f080dd81e
[INFO] checking donjne/rust_tutorial against try#44f3504e96c944ae54fc72b5f5008f53f7eda001 for pr-136776
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdonjne%2Frust_tutorial" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/donjne/rust_tutorial on toolchain 44f3504e96c944ae54fc72b5f5008f53f7eda001
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44f3504e96c944ae54fc72b5f5008f53f7eda001" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/donjne/rust_tutorial
[INFO] finished tweaking git repo https://github.com/donjne/rust_tutorial
[INFO] tweaked toml for git repo https://github.com/donjne/rust_tutorial written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/donjne/rust_tutorial 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" "+44f3504e96c944ae54fc72b5f5008f53f7eda001" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking donjne/rust_tutorial against try#44f3504e96c944ae54fc72b5f5008f53f7eda001 for pr-136776
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdonjne%2Frust_tutorial" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/donjne/rust_tutorial on toolchain 44f3504e96c944ae54fc72b5f5008f53f7eda001
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44f3504e96c944ae54fc72b5f5008f53f7eda001" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/donjne/rust_tutorial
[INFO] finished tweaking git repo https://github.com/donjne/rust_tutorial
[INFO] tweaked toml for git repo https://github.com/donjne/rust_tutorial written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/donjne/rust_tutorial 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" "+44f3504e96c944ae54fc72b5f5008f53f7eda001" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+44f3504e96c944ae54fc72b5f5008f53f7eda001" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b4cf5ef8726e1c49cdc34bf6bf4991545d3b3dca809250f1d579042b415ac5fc
[INFO] running `Command { std: "docker" "start" "-a" "b4cf5ef8726e1c49cdc34bf6bf4991545d3b3dca809250f1d579042b415ac5fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b4cf5ef8726e1c49cdc34bf6bf4991545d3b3dca809250f1d579042b415ac5fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4cf5ef8726e1c49cdc34bf6bf4991545d3b3dca809250f1d579042b415ac5fc", kill_on_drop: false }`
[INFO] [stdout] b4cf5ef8726e1c49cdc34bf6bf4991545d3b3dca809250f1d579042b415ac5fc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+44f3504e96c944ae54fc72b5f5008f53f7eda001" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69abcad29e7303bc02c4d62e1f0a3c4f6073784247516c4e95e03e18f81e0e99
[INFO] running `Command { std: "docker" "start" "-a" "69abcad29e7303bc02c4d62e1f0a3c4f6073784247516c4e95e03e18f81e0e99", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking rust_tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/bin/statements.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let y = 6;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reference_to_nothing`
[INFO] [stdout]  --> src/bin/dangling.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let reference_to_nothing = dangle();
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference_to_nothing`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `while_array` is never used
[INFO] [stdout]   --> src/bin/loop.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |         fn while_array() {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_loop` is never used
[INFO] [stdout]   --> src/bin/loop.rs:40:16
[INFO] [stdout]    |
[INFO] [stdout] 40 |             fn for_loop() {
[INFO] [stdout]    |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_sequenceandrev` is never used
[INFO] [stdout]   --> src/bin/loop.rs:47:20
[INFO] [stdout]    |
[INFO] [stdout] 47 |                 fn for_sequenceandrev() {
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]  --> src/bin/return_values_and_scope.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     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]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> src/bin/statements.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let y = 6;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `guess`
[INFO] [stdout]   --> src/bin/variables.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     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: `guess`
[INFO] [stdout]   --> src/bin/variables.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     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: `sum`
[INFO] [stdout]   --> src/bin/floating.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let sum = 5 + 10;
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difference`
[INFO] [stdout]   --> src/bin/floating.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         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/bin/floating.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 |         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/bin/floating.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         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: `reference_to_nothing`
[INFO] [stdout]  --> src/bin/dangling.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let reference_to_nothing = dangle();
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference_to_nothing`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `truncated`
[INFO] [stdout]   --> src/bin/floating.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let truncated = -5 / 3; // Results in -1
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_truncated`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `remainder`
[INFO] [stdout]   --> src/bin/floating.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |         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/bin/floating.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |             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/bin/floating.rs:26:17
[INFO] [stdout]    |
[INFO] [stdout] 26 |             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/bin/floating.rs:30:21
[INFO] [stdout]    |
[INFO] [stdout] 30 |                 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/bin/floating.rs:31:21
[INFO] [stdout]    |
[INFO] [stdout] 31 |                 let z: char = 'ℤ'; // with explicit type annotation
[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/bin/floating.rs:32:21
[INFO] [stdout]    |
[INFO] [stdout] 32 |                 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: `x`
[INFO] [stdout]   --> src/bin/floating.rs:36:26
[INFO] [stdout]    |
[INFO] [stdout] 36 |                     let (x, y, z) = tup;
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/bin/floating.rs:36:32
[INFO] [stdout]    |
[INFO] [stdout] 36 |                     let (x, y, z) = tup;
[INFO] [stdout]    |                                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `five_hundred`
[INFO] [stdout]   --> src/bin/floating.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let five_hundred = x.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/bin/floating.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let six_point_four = x.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/bin/floating.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let one = x.2;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_one`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `anexample`
[INFO] [stdout]   --> src/bin/floating.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let anexample = [1, 2, 3, 4, 5];
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_anexample`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/bin/floating.rs:50:13
[INFO] [stdout]    |
[INFO] [stdout] 50 |         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: `a`
[INFO] [stdout]   --> src/bin/floating.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let a = [3; 5];
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]   --> src/bin/floating.rs:56:17
[INFO] [stdout]    |
[INFO] [stdout] 56 |             let first = a[0];
[INFO] [stdout]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `second`
[INFO] [stdout]   --> src/bin/floating.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 57 |             let second = a[1];
[INFO] [stdout]    |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `booleans` is never used
[INFO] [stdout]   --> src/bin/floating.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |         fn booleans() {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `characters` is never used
[INFO] [stdout]   --> src/bin/floating.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |         fn characters() {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuples` is never used
[INFO] [stdout]   --> src/bin/floating.rs:34:20
[INFO] [stdout]    |
[INFO] [stdout] 34 |                 fn tuples() {
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_example_two` is never used
[INFO] [stdout]   --> src/bin/floating.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn tuple_example_two() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `array` is never used
[INFO] [stdout]   --> src/bin/floating.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn array() {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `accessing_array` is never used
[INFO] [stdout]   --> src/bin/floating.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |         fn accessing_array() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `while_array` is never used
[INFO] [stdout]   --> src/bin/loop.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |         fn while_array() {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_loop` is never used
[INFO] [stdout]   --> src/bin/loop.rs:40:16
[INFO] [stdout]    |
[INFO] [stdout] 40 |             fn for_loop() {
[INFO] [stdout]    |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_sequenceandrev` is never used
[INFO] [stdout]   --> src/bin/loop.rs:47:20
[INFO] [stdout]    |
[INFO] [stdout] 47 |                 fn for_sequenceandrev() {
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]  --> src/bin/return_values_and_scope.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     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]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/bin/floating.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let sum = 5 + 10;
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difference`
[INFO] [stdout]   --> src/bin/floating.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         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/bin/floating.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 |         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/bin/floating.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         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: `truncated`
[INFO] [stdout]   --> src/bin/floating.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |         let truncated = -5 / 3; // Results in -1
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_truncated`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `remainder`
[INFO] [stdout]   --> src/bin/floating.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |         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/bin/floating.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |             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/bin/floating.rs:26:17
[INFO] [stdout]    |
[INFO] [stdout] 26 |             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/bin/floating.rs:30:21
[INFO] [stdout]    |
[INFO] [stdout] 30 |                 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/bin/floating.rs:31:21
[INFO] [stdout]    |
[INFO] [stdout] 31 |                 let z: char = 'ℤ'; // with explicit type annotation
[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/bin/floating.rs:32:21
[INFO] [stdout]    |
[INFO] [stdout] 32 |                 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: `x`
[INFO] [stdout]   --> src/bin/floating.rs:36:26
[INFO] [stdout]    |
[INFO] [stdout] 36 |                     let (x, y, z) = tup;
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/bin/floating.rs:36:32
[INFO] [stdout]    |
[INFO] [stdout] 36 |                     let (x, y, z) = tup;
[INFO] [stdout]    |                                ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `five_hundred`
[INFO] [stdout]   --> src/bin/floating.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |     let five_hundred = x.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/bin/floating.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let six_point_four = x.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/bin/floating.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let one = x.2;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_one`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `anexample`
[INFO] [stdout]   --> src/bin/floating.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let anexample = [1, 2, 3, 4, 5];
[INFO] [stdout]    |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_anexample`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/bin/floating.rs:50:13
[INFO] [stdout]    |
[INFO] [stdout] 50 |         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: `a`
[INFO] [stdout]   --> src/bin/floating.rs:51:13
[INFO] [stdout]    |
[INFO] [stdout] 51 |         let a = [3; 5];
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]   --> src/bin/floating.rs:56:17
[INFO] [stdout]    |
[INFO] [stdout] 56 |             let first = a[0];
[INFO] [stdout]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `second`
[INFO] [stdout]   --> src/bin/floating.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 57 |             let second = a[1];
[INFO] [stdout]    |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `booleans` is never used
[INFO] [stdout]   --> src/bin/floating.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |         fn booleans() {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `characters` is never used
[INFO] [stdout]   --> src/bin/floating.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 |         fn characters() {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuples` is never used
[INFO] [stdout]   --> src/bin/floating.rs:34:20
[INFO] [stdout]    |
[INFO] [stdout] 34 |                 fn tuples() {
[INFO] [stdout]    |                    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple_example_two` is never used
[INFO] [stdout]   --> src/bin/floating.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn tuple_example_two() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `array` is never used
[INFO] [stdout]   --> src/bin/floating.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn array() {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `accessing_array` is never used
[INFO] [stdout]   --> src/bin/floating.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |         fn accessing_array() {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.04s
[INFO] running `Command { std: "docker" "inspect" "69abcad29e7303bc02c4d62e1f0a3c4f6073784247516c4e95e03e18f81e0e99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69abcad29e7303bc02c4d62e1f0a3c4f6073784247516c4e95e03e18f81e0e99", kill_on_drop: false }`
[INFO] [stdout] 69abcad29e7303bc02c4d62e1f0a3c4f6073784247516c4e95e03e18f81e0e99
