[INFO] cloning repository https://github.com/xeron56/rust_programming
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xeron56/rust_programming" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxeron56%2Frust_programming", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxeron56%2Frust_programming'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 713c00e80573778f94cd280f73d18331d9515073
[INFO] testing xeron56/rust_programming against master#1871252fc8bb672d40787e67404e6eaae7059369 for pr-125151
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxeron56%2Frust_programming" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/xeron56/rust_programming on toolchain 1871252fc8bb672d40787e67404e6eaae7059369
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/xeron56/rust_programming
[INFO] finished tweaking git repo https://github.com/xeron56/rust_programming
[INFO] tweaked toml for git repo https://github.com/xeron56/rust_programming written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/xeron56/rust_programming 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" "+1871252fc8bb672d40787e67404e6eaae7059369" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7993001db625ef66801ff23f9f7e196900020da36ede84280f12f8b447358b6b
[INFO] running `Command { std: "docker" "start" "-a" "7993001db625ef66801ff23f9f7e196900020da36ede84280f12f8b447358b6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7993001db625ef66801ff23f9f7e196900020da36ede84280f12f8b447358b6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7993001db625ef66801ff23f9f7e196900020da36ede84280f12f8b447358b6b", kill_on_drop: false }`
[INFO] [stdout] 7993001db625ef66801ff23f9f7e196900020da36ede84280f12f8b447358b6b
[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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bb78283a068d1b5aab94c1b24da283ebb8eec1b6857661d55a315f034866c0a8
[INFO] running `Command { std: "docker" "start" "-a" "bb78283a068d1b5aab94c1b24da283ebb8eec1b6857661d55a315f034866c0a8", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_programming v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/chapter1.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let a: i32 = 42;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/chapter1.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let b: u8 = 255;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/chapter1.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let x: f64 = 3.14;
[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/chapter1.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let y: f32 = 2.71828;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_true`
[INFO] [stdout]   --> src/chapter1.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let is_true: bool = true;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_true`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_false`
[INFO] [stdout]   --> src/chapter1.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let is_false: bool = false;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_false`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/chapter1.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let c: char = 'A';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `emoji`
[INFO] [stdout]   --> src/chapter1.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let emoji: char = '😀';
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_emoji`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/chapter2.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2 = s1; // s1 is no longer valid
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/chapter3.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let y: Option<i32> = None;
[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/chapter5.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2 = s1; // s1 is no longer valid
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/chapter5.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let mut v = vec![1, 2, 3];
[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: field `content` is never read
[INFO] [stdout]   --> src/chapter6.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 8  | struct NewsArticle {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 12 |     content: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/chapter6.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Tweet {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 24 |     reply: bool,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 25 |     retweet: bool,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `start` is never read
[INFO] [stdout]   --> src/chapter6.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct Range {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 55 |     start: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "bb78283a068d1b5aab94c1b24da283ebb8eec1b6857661d55a315f034866c0a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb78283a068d1b5aab94c1b24da283ebb8eec1b6857661d55a315f034866c0a8", kill_on_drop: false }`
[INFO] [stdout] bb78283a068d1b5aab94c1b24da283ebb8eec1b6857661d55a315f034866c0a8
[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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 28ed9575adcefc07458a9a3e33583b87f86cb3c958567a799a8a6f7e5fc3b566
[INFO] running `Command { std: "docker" "start" "-a" "28ed9575adcefc07458a9a3e33583b87f86cb3c958567a799a8a6f7e5fc3b566", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_programming v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/chapter1.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let a: i32 = 42;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/chapter1.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let b: u8 = 255;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/chapter1.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let x: f64 = 3.14;
[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/chapter1.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let y: f32 = 2.71828;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_true`
[INFO] [stdout]   --> src/chapter1.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let is_true: bool = true;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_true`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_false`
[INFO] [stdout]   --> src/chapter1.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let is_false: bool = false;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_false`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/chapter1.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let c: char = 'A';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `emoji`
[INFO] [stdout]   --> src/chapter1.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let emoji: char = '😀';
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_emoji`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/chapter2.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2 = s1; // s1 is no longer valid
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/chapter3.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let y: Option<i32> = None;
[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/chapter5.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2 = s1; // s1 is no longer valid
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/chapter5.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let mut v = vec![1, 2, 3];
[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: field `content` is never read
[INFO] [stdout]   --> src/chapter6.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 8  | struct NewsArticle {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 12 |     content: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/chapter6.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Tweet {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 24 |     reply: bool,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 25 |     retweet: bool,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `start` is never read
[INFO] [stdout]   --> src/chapter6.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct Range {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 55 |     start: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "28ed9575adcefc07458a9a3e33583b87f86cb3c958567a799a8a6f7e5fc3b566", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28ed9575adcefc07458a9a3e33583b87f86cb3c958567a799a8a6f7e5fc3b566", kill_on_drop: false }`
[INFO] [stdout] 28ed9575adcefc07458a9a3e33583b87f86cb3c958567a799a8a6f7e5fc3b566
[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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+1871252fc8bb672d40787e67404e6eaae7059369" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] fb8551f787fd292fe52863c9c00a164d57eb04fb6d910c0e713182288cff2ff8
[INFO] running `Command { std: "docker" "start" "-a" "fb8551f787fd292fe52863c9c00a164d57eb04fb6d910c0e713182288cff2ff8", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> src/chapter1.rs:26:9
[INFO] [stderr]    |
[INFO] [stderr] 26 |     let a: i32 = 42;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/chapter1.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let b: u8 = 255;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/chapter1.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let x: f64 = 3.14;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/chapter1.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let y: f32 = 2.71828;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `is_true`
[INFO] [stderr]   --> src/chapter1.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let is_true: bool = true;
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_true`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `is_false`
[INFO] [stderr]   --> src/chapter1.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 |     let is_false: bool = false;
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_false`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]   --> src/chapter1.rs:38:9
[INFO] [stderr]    |
[INFO] [stderr] 38 |     let c: char = 'A';
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `emoji`
[INFO] [stderr]   --> src/chapter1.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |     let emoji: char = '😀';
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_emoji`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s2`
[INFO] [stderr]  --> src/chapter2.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let s2 = s1; // s1 is no longer valid
[INFO] [stderr]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/chapter3.rs:82:9
[INFO] [stderr]    |
[INFO] [stderr] 82 |     let y: Option<i32> = None;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s2`
[INFO] [stderr]  --> src/chapter5.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let s2 = s1; // s1 is no longer valid
[INFO] [stderr]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/chapter5.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let mut v = vec![1, 2, 3];
[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: field `content` is never read
[INFO] [stderr]   --> src/chapter6.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 8  | struct NewsArticle {
[INFO] [stderr]    |        ----------- field in this struct
[INFO] [stderr] ...
[INFO] [stderr] 12 |     content: String,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `reply` and `retweet` are never read
[INFO] [stderr]   --> src/chapter6.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 21 | struct Tweet {
[INFO] [stderr]    |        ----- fields in this struct
[INFO] [stderr] ...
[INFO] [stderr] 24 |     reply: bool,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 25 |     retweet: bool,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `start` is never read
[INFO] [stderr]   --> src/chapter6.rs:55:5
[INFO] [stderr]    |
[INFO] [stderr] 54 | struct Range {
[INFO] [stderr]    |        ----- field in this struct
[INFO] [stderr] 55 |     start: i32,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_programming` (bin "rust_programming" test) generated 15 warnings (run `cargo fix --bin "rust_programming" --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_programming-21a2bbe77e2a590b)
[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" "fb8551f787fd292fe52863c9c00a164d57eb04fb6d910c0e713182288cff2ff8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb8551f787fd292fe52863c9c00a164d57eb04fb6d910c0e713182288cff2ff8", kill_on_drop: false }`
[INFO] [stdout] fb8551f787fd292fe52863c9c00a164d57eb04fb6d910c0e713182288cff2ff8
[INFO] testing xeron56/rust_programming against try#b642703cf9526da1e72c0b6755753b939a9c6b6d for pr-125151
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxeron56%2Frust_programming" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/xeron56/rust_programming on toolchain b642703cf9526da1e72c0b6755753b939a9c6b6d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/xeron56/rust_programming
[INFO] finished tweaking git repo https://github.com/xeron56/rust_programming
[INFO] tweaked toml for git repo https://github.com/xeron56/rust_programming written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/xeron56/rust_programming 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" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 713882dd8627508682baf0f1161db6d21c2a8c834e1179365e528796a2a4bcd3
[INFO] running `Command { std: "docker" "start" "-a" "713882dd8627508682baf0f1161db6d21c2a8c834e1179365e528796a2a4bcd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "713882dd8627508682baf0f1161db6d21c2a8c834e1179365e528796a2a4bcd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "713882dd8627508682baf0f1161db6d21c2a8c834e1179365e528796a2a4bcd3", kill_on_drop: false }`
[INFO] [stdout] 713882dd8627508682baf0f1161db6d21c2a8c834e1179365e528796a2a4bcd3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e4fca942b445f9041620b3ba36b515198c3844d26da080ef188144a7e7f4df08
[INFO] running `Command { std: "docker" "start" "-a" "e4fca942b445f9041620b3ba36b515198c3844d26da080ef188144a7e7f4df08", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_programming v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/chapter1.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let a: i32 = 42;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/chapter1.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let b: u8 = 255;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/chapter1.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let x: f64 = 3.14;
[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/chapter1.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let y: f32 = 2.71828;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_true`
[INFO] [stdout]   --> src/chapter1.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let is_true: bool = true;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_true`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_false`
[INFO] [stdout]   --> src/chapter1.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let is_false: bool = false;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_false`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/chapter1.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let c: char = 'A';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `emoji`
[INFO] [stdout]   --> src/chapter1.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let emoji: char = '😀';
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_emoji`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/chapter2.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2 = s1; // s1 is no longer valid
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/chapter3.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let y: Option<i32> = None;
[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/chapter5.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2 = s1; // s1 is no longer valid
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/chapter5.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let mut v = vec![1, 2, 3];
[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: field `content` is never read
[INFO] [stdout]   --> src/chapter6.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 8  | struct NewsArticle {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 12 |     content: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/chapter6.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Tweet {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 24 |     reply: bool,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 25 |     retweet: bool,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `start` is never read
[INFO] [stdout]   --> src/chapter6.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct Range {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 55 |     start: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "e4fca942b445f9041620b3ba36b515198c3844d26da080ef188144a7e7f4df08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4fca942b445f9041620b3ba36b515198c3844d26da080ef188144a7e7f4df08", kill_on_drop: false }`
[INFO] [stdout] e4fca942b445f9041620b3ba36b515198c3844d26da080ef188144a7e7f4df08
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:59a85a07ab18ca8720692f8e61effa1c651d9e2ca591e072c2b212bb91a6b8b5" "/opt/rustwide/cargo-home/bin/cargo" "+b642703cf9526da1e72c0b6755753b939a9c6b6d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e4ae77bcc11ebe8ba58da224dcd0400e5f0439f4f17fc1f4b638708aa2f3b21c
[INFO] running `Command { std: "docker" "start" "-a" "e4ae77bcc11ebe8ba58da224dcd0400e5f0439f4f17fc1f4b638708aa2f3b21c", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_programming v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/chapter1.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let a: i32 = 42;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/chapter1.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let b: u8 = 255;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/chapter1.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let x: f64 = 3.14;
[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/chapter1.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let y: f32 = 2.71828;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_true`
[INFO] [stdout]   --> src/chapter1.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let is_true: bool = true;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_true`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `is_false`
[INFO] [stdout]   --> src/chapter1.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let is_false: bool = false;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_is_false`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/chapter1.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let c: char = 'A';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `emoji`
[INFO] [stdout]   --> src/chapter1.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let emoji: char = '😀';
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_emoji`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> src/chapter2.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2 = s1; // s1 is no longer valid
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/chapter3.rs:82:9
[INFO] [stdout]    |
[INFO] [stdout] 82 |     let y: Option<i32> = None;
[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/chapter5.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2 = s1; // s1 is no longer valid
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/chapter5.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let mut v = vec![1, 2, 3];
[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: field `content` is never read
[INFO] [stdout]   --> src/chapter6.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 8  | struct NewsArticle {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 12 |     content: String,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `reply` and `retweet` are never read
[INFO] [stdout]   --> src/chapter6.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Tweet {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 24 |     reply: bool,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 25 |     retweet: bool,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `start` is never read
[INFO] [stdout]   --> src/chapter6.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct Range {
[INFO] [stdout]    |        ----- field in this struct
[INFO] [stdout] 55 |     start: i32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: LC_ALL="C" PATH="/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/bin:/opt/rustwide/cargo-home/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" VSLANG="1033" "cc" "-m64" "/tmp/rustcmdmfdB/symbols.o" "/opt/rustwide/target/debug/deps/rust_programming-21a2bbe77e2a590b.rust_programming.98a01b93cf17fd82-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/rust_programming-21a2bbe77e2a590b.7ngfn8g7qg59p0h2pbmwvp4wy.rcgu.o" "-Wl,--as-needed" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-9fe2882344d54f63.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-9a21fdde14ac91dc.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunicode_width-df7cac1850604c78.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_std-2f3836017b2380f6.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-de48b8168d6cf4fa.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-9f3477fb95a0bba7.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-210d920812faea91.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-f3d3451767410a17.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-1a79dd36d08251de.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-886230e7120831b2.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-2caea079085a58a2.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-a9d7d97cdc65a449.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-5727477b0a78105a.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-7e555563aa211118.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-c8f13465f1a795b2.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-ee5b5774583426df.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-14df174c91007922.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-e8bfe52be756260a.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-6275035a459b3ada.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-b6892f3c52c68f01.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-f72b956e24d1de70.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-632ae0f28c5e55ff.rlib" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-e8b7e96e438f08f6.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/opt/rustwide/rustup-home/toolchains/b642703cf9526da1e72c0b6755753b939a9c6b6d/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/rust_programming-21a2bbe77e2a590b" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
[INFO] [stdout]   = note: /usr/bin/ld: final link failed: No space left on device
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_programming` (bin "rust_programming" test) due to 2 previous errors; 15 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "e4ae77bcc11ebe8ba58da224dcd0400e5f0439f4f17fc1f4b638708aa2f3b21c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4ae77bcc11ebe8ba58da224dcd0400e5f0439f4f17fc1f4b638708aa2f3b21c", kill_on_drop: false }`
[INFO] [stdout] e4ae77bcc11ebe8ba58da224dcd0400e5f0439f4f17fc1f4b638708aa2f3b21c
