[INFO] cloning repository https://github.com/kamilWyszynski1/rust-first-steps [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kamilWyszynski1/rust-first-steps" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FkamilWyszynski1%2Frust-first-steps", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FkamilWyszynski1%2Frust-first-steps'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 76a177555371d6735a49d5bd2305fbfacbe4bf4e [INFO] testing kamilWyszynski1/rust-first-steps against beta-2021-09-08 for beta-1.56-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FkamilWyszynski1%2Frust-first-steps" "/workspace/builds/worker-7/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/kamilWyszynski1/rust-first-steps on toolchain beta-2021-09-08 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/kamilWyszynski1/rust-first-steps [INFO] finished tweaking git repo https://github.com/kamilWyszynski1/rust-first-steps [INFO] tweaked toml for git repo https://github.com/kamilWyszynski1/rust-first-steps written to /workspace/builds/worker-7/source/Cargo.toml [INFO] crate git repo https://github.com/kamilWyszynski1/rust-first-steps already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded smawk v0.3.1 [INFO] [stderr] Downloaded textwrap v0.13.4 [INFO] [stderr] Downloaded ferris-says v0.2.1 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 5fd3373f99f55ef8e30f7badcee9d81187c50bf7f4e2260189effe7cf6e9fbfe [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" "5fd3373f99f55ef8e30f7badcee9d81187c50bf7f4e2260189effe7cf6e9fbfe", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "5fd3373f99f55ef8e30f7badcee9d81187c50bf7f4e2260189effe7cf6e9fbfe", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5fd3373f99f55ef8e30f7badcee9d81187c50bf7f4e2260189effe7cf6e9fbfe", kill_on_drop: false }` [INFO] [stdout] 5fd3373f99f55ef8e30f7badcee9d81187c50bf7f4e2260189effe7cf6e9fbfe [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--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] 728071dac90ae9d6a5a3c6745002f5bb813b64e0e47d8e9b404b966a874f36cc [INFO] running `Command { std: "docker" "start" "-a" "728071dac90ae9d6a5a3c6745002f5bb813b64e0e47d8e9b404b966a874f36cc", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.99 [INFO] [stderr] Compiling smawk v0.3.1 [INFO] [stderr] Compiling smallvec v0.4.5 [INFO] [stderr] Compiling textwrap v0.13.4 [INFO] [stderr] Compiling ferris-says v0.2.1 [INFO] [stderr] Compiling getrandom v0.2.3 [INFO] [stderr] Compiling rand_core v0.6.3 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling rand v0.8.4 [INFO] [stderr] Compiling first-steps v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/main.rs:304:9 [INFO] [stdout] | [INFO] [stdout] 304 | let r1 = &s; // immutable ref [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/main.rs:305:9 [INFO] [stdout] | [INFO] [stdout] 305 | let r2 = &s; // another one, it's ok [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r3` [INFO] [stdout] --> src/main.rs:306:9 [INFO] [stdout] | [INFO] [stdout] 306 | let r3 = &mut s; // problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/main.rs:336:9 [INFO] [stdout] | [INFO] [stdout] 336 | let hello = &s[0..5]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `world` [INFO] [stdout] --> src/main.rs:337:9 [INFO] [stdout] | [INFO] [stdout] 337 | let world = &s[6..11]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_world` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/main.rs:343:9 [INFO] [stdout] | [INFO] [stdout] 343 | let slice = &s[0..len]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/main.rs:344:9 [INFO] [stdout] | [INFO] [stdout] 344 | let slice = &s[..]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/main.rs:370:11 [INFO] [stdout] | [INFO] [stdout] 370 | fn change(s: &String) { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user2` [INFO] [stdout] --> src/main.rs:397:13 [INFO] [stdout] | [INFO] [stdout] 397 | let mut user2 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user2` [INFO] [stdout] --> src/main.rs:416:9 [INFO] [stdout] | [INFO] [stdout] 416 | let user2 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `no` [INFO] [stdout] --> src/main.rs:500:9 [INFO] [stdout] | [INFO] [stdout] 500 | let no: Option = None; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_no` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:397:9 [INFO] [stdout] | [INFO] [stdout] 397 | let mut user2 = User { [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: function is never used: `references_and_borrowing` [INFO] [stdout] --> src/main.rs:286:4 [INFO] [stdout] | [INFO] [stdout] 286 | fn references_and_borrowing() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `calculate_length` [INFO] [stdout] --> src/main.rs:361:4 [INFO] [stdout] | [INFO] [stdout] 361 | fn calculate_length(s: String) -> usize { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `calculate_length_ref` [INFO] [stdout] --> src/main.rs:366:4 [INFO] [stdout] | [INFO] [stdout] 366 | fn calculate_length_ref(str: &String) -> usize { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `change` [INFO] [stdout] --> src/main.rs:370:4 [INFO] [stdout] | [INFO] [stdout] 370 | fn change(s: &String) { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `change_mut` [INFO] [stdout] --> src/main.rs:374:4 [INFO] [stdout] | [INFO] [stdout] 374 | fn change_mut(s: &mut String) { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `structs` [INFO] [stdout] --> src/main.rs:379:4 [INFO] [stdout] | [INFO] [stdout] 379 | fn structs() { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `calc_rect_area` [INFO] [stdout] --> src/main.rs:428:4 [INFO] [stdout] | [INFO] [stdout] 428 | fn calc_rect_area() { [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `enums` [INFO] [stdout] --> src/main.rs:474:4 [INFO] [stdout] | [INFO] [stdout] 474 | fn enums() { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `common_collections` [INFO] [stdout] --> src/main.rs:541:4 [INFO] [stdout] | [INFO] [stdout] 541 | fn common_collections() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 21 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 11.64s [INFO] running `Command { std: "docker" "inspect" "728071dac90ae9d6a5a3c6745002f5bb813b64e0e47d8e9b404b966a874f36cc", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "728071dac90ae9d6a5a3c6745002f5bb813b64e0e47d8e9b404b966a874f36cc", kill_on_drop: false }` [INFO] [stdout] 728071dac90ae9d6a5a3c6745002f5bb813b64e0e47d8e9b404b966a874f36cc [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "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] 7ef40c7778f57963a128dae08fb08bade1a436d4b943be7fd77b2be1c35edfd6 [INFO] running `Command { std: "docker" "start" "-a" "7ef40c7778f57963a128dae08fb08bade1a436d4b943be7fd77b2be1c35edfd6", kill_on_drop: false }` [INFO] [stderr] Compiling first-steps v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/main.rs:304:9 [INFO] [stdout] | [INFO] [stdout] 304 | let r1 = &s; // immutable ref [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/main.rs:305:9 [INFO] [stdout] | [INFO] [stdout] 305 | let r2 = &s; // another one, it's ok [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r3` [INFO] [stdout] --> src/main.rs:306:9 [INFO] [stdout] | [INFO] [stdout] 306 | let r3 = &mut s; // problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/main.rs:336:9 [INFO] [stdout] | [INFO] [stdout] 336 | let hello = &s[0..5]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `world` [INFO] [stdout] --> src/main.rs:337:9 [INFO] [stdout] | [INFO] [stdout] 337 | let world = &s[6..11]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_world` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/main.rs:343:9 [INFO] [stdout] | [INFO] [stdout] 343 | let slice = &s[0..len]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/main.rs:344:9 [INFO] [stdout] | [INFO] [stdout] 344 | let slice = &s[..]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/main.rs:370:11 [INFO] [stdout] | [INFO] [stdout] 370 | fn change(s: &String) { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user2` [INFO] [stdout] --> src/main.rs:397:13 [INFO] [stdout] | [INFO] [stdout] 397 | let mut user2 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user2` [INFO] [stdout] --> src/main.rs:416:9 [INFO] [stdout] | [INFO] [stdout] 416 | let user2 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `no` [INFO] [stdout] --> src/main.rs:500:9 [INFO] [stdout] | [INFO] [stdout] 500 | let no: Option = None; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_no` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:397:9 [INFO] [stdout] | [INFO] [stdout] 397 | let mut user2 = User { [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: function is never used: `references_and_borrowing` [INFO] [stdout] --> src/main.rs:286:4 [INFO] [stdout] | [INFO] [stdout] 286 | fn references_and_borrowing() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `calculate_length` [INFO] [stdout] --> src/main.rs:361:4 [INFO] [stdout] | [INFO] [stdout] 361 | fn calculate_length(s: String) -> usize { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `calculate_length_ref` [INFO] [stdout] --> src/main.rs:366:4 [INFO] [stdout] | [INFO] [stdout] 366 | fn calculate_length_ref(str: &String) -> usize { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `change` [INFO] [stdout] --> src/main.rs:370:4 [INFO] [stdout] | [INFO] [stdout] 370 | fn change(s: &String) { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `change_mut` [INFO] [stdout] --> src/main.rs:374:4 [INFO] [stdout] | [INFO] [stdout] 374 | fn change_mut(s: &mut String) { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `structs` [INFO] [stdout] --> src/main.rs:379:4 [INFO] [stdout] | [INFO] [stdout] 379 | fn structs() { [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `calc_rect_area` [INFO] [stdout] --> src/main.rs:428:4 [INFO] [stdout] | [INFO] [stdout] 428 | fn calc_rect_area() { [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `enums` [INFO] [stdout] --> src/main.rs:474:4 [INFO] [stdout] | [INFO] [stdout] 474 | fn enums() { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `common_collections` [INFO] [stdout] --> src/main.rs:541:4 [INFO] [stdout] | [INFO] [stdout] 541 | fn common_collections() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 21 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 1.10s [INFO] running `Command { std: "docker" "inspect" "7ef40c7778f57963a128dae08fb08bade1a436d4b943be7fd77b2be1c35edfd6", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "7ef40c7778f57963a128dae08fb08bade1a436d4b943be7fd77b2be1c35edfd6", kill_on_drop: false }` [INFO] [stdout] 7ef40c7778f57963a128dae08fb08bade1a436d4b943be7fd77b2be1c35edfd6 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 9fd18d7e193e23d9e7f63b50914ab0d02c63c1d7a52a2a77c33a8103ef5d0159 [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" "9fd18d7e193e23d9e7f63b50914ab0d02c63c1d7a52a2a77c33a8103ef5d0159", kill_on_drop: false }` [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/main.rs:304:9 [INFO] [stderr] | [INFO] [stderr] 304 | let r1 = &s; // immutable ref [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/main.rs:305:9 [INFO] [stderr] | [INFO] [stderr] 305 | let r2 = &s; // another one, it's ok [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r3` [INFO] [stderr] --> src/main.rs:306:9 [INFO] [stderr] | [INFO] [stderr] 306 | let r3 = &mut s; // problem [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r3` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `hello` [INFO] [stderr] --> src/main.rs:336:9 [INFO] [stderr] | [INFO] [stderr] 336 | let hello = &s[0..5]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `world` [INFO] [stderr] --> src/main.rs:337:9 [INFO] [stderr] | [INFO] [stderr] 337 | let world = &s[6..11]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_world` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:343:9 [INFO] [stderr] | [INFO] [stderr] 343 | let slice = &s[0..len]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:344:9 [INFO] [stderr] | [INFO] [stderr] 344 | let slice = &s[..]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/main.rs:370:11 [INFO] [stderr] | [INFO] [stderr] 370 | fn change(s: &String) { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `user2` [INFO] [stderr] --> src/main.rs:397:13 [INFO] [stderr] | [INFO] [stderr] 397 | let mut user2 = User { [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `user2` [INFO] [stderr] --> src/main.rs:416:9 [INFO] [stderr] | [INFO] [stderr] 416 | let user2 = User { [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `no` [INFO] [stderr] --> src/main.rs:500:9 [INFO] [stderr] | [INFO] [stderr] 500 | let no: Option = None; [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_no` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:397:9 [INFO] [stderr] | [INFO] [stderr] 397 | let mut user2 = User { [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: function is never used: `references_and_borrowing` [INFO] [stderr] --> src/main.rs:286:4 [INFO] [stderr] | [INFO] [stderr] 286 | fn references_and_borrowing() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `calculate_length` [INFO] [stderr] --> src/main.rs:361:4 [INFO] [stderr] | [INFO] [stderr] 361 | fn calculate_length(s: String) -> usize { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `calculate_length_ref` [INFO] [stderr] --> src/main.rs:366:4 [INFO] [stderr] | [INFO] [stderr] 366 | fn calculate_length_ref(str: &String) -> usize { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `change` [INFO] [stderr] --> src/main.rs:370:4 [INFO] [stderr] | [INFO] [stderr] 370 | fn change(s: &String) { [INFO] [stderr] | ^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `change_mut` [INFO] [stderr] --> src/main.rs:374:4 [INFO] [stderr] | [INFO] [stderr] 374 | fn change_mut(s: &mut String) { [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `structs` [INFO] [stderr] --> src/main.rs:379:4 [INFO] [stderr] | [INFO] [stderr] 379 | fn structs() { [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `calc_rect_area` [INFO] [stderr] --> src/main.rs:428:4 [INFO] [stderr] | [INFO] [stderr] 428 | fn calc_rect_area() { [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `enums` [INFO] [stderr] --> src/main.rs:474:4 [INFO] [stderr] | [INFO] [stderr] 474 | fn enums() { [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `common_collections` [INFO] [stderr] --> src/main.rs:541:4 [INFO] [stderr] | [INFO] [stderr] 541 | fn common_collections() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: `first-steps` (bin "first-steps" test) generated 21 warnings [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.02s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/first_steps-f6dae94997ba95d9) [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" "9fd18d7e193e23d9e7f63b50914ab0d02c63c1d7a52a2a77c33a8103ef5d0159", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "9fd18d7e193e23d9e7f63b50914ab0d02c63c1d7a52a2a77c33a8103ef5d0159", kill_on_drop: false }` [INFO] [stdout] 9fd18d7e193e23d9e7f63b50914ab0d02c63c1d7a52a2a77c33a8103ef5d0159