[INFO] cloning repository https://github.com/akthrms/code-like-a-pro-in-rust [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/akthrms/code-like-a-pro-in-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fakthrms%2Fcode-like-a-pro-in-rust", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fakthrms%2Fcode-like-a-pro-in-rust'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] b690a0fe164afe1b9dcb7e549504e98147cc4c10 [INFO] checking akthrms/code-like-a-pro-in-rust against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fakthrms%2Fcode-like-a-pro-in-rust" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/akthrms/code-like-a-pro-in-rust on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/akthrms/code-like-a-pro-in-rust [INFO] finished tweaking git repo https://github.com/akthrms/code-like-a-pro-in-rust [INFO] tweaked toml for git repo https://github.com/akthrms/code-like-a-pro-in-rust written to /workspace/builds/worker-2-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/akthrms/code-like-a-pro-in-rust 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 1cfc8c1c8900562fe1aef92601fc76cdff90eb86692890c7a14b3df0b64ea02e [INFO] running `Command { std: "docker" "start" "-a" "1cfc8c1c8900562fe1aef92601fc76cdff90eb86692890c7a14b3df0b64ea02e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "1cfc8c1c8900562fe1aef92601fc76cdff90eb86692890c7a14b3df0b64ea02e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1cfc8c1c8900562fe1aef92601fc76cdff90eb86692890c7a14b3df0b64ea02e", kill_on_drop: false }` [INFO] [stdout] 1cfc8c1c8900562fe1aef92601fc76cdff90eb86692890c7a14b3df0b64ea02e [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 5f36e9e08f4f410f092dc0c6986e66287c8d0e573377d47b4d9a15289113f076 [INFO] running `Command { std: "docker" "start" "-a" "5f36e9e08f4f410f092dc0c6986e66287c8d0e573377d47b4d9a15289113f076", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.153 [INFO] [stderr] Compiling autocfg v1.2.0 [INFO] [stderr] Compiling proc-macro2 v1.0.79 [INFO] [stderr] Compiling unicode-ident v1.0.12 [INFO] [stderr] Checking pin-project-lite v0.2.14 [INFO] [stderr] Checking smallvec v1.13.2 [INFO] [stderr] Checking bytes v1.6.0 [INFO] [stderr] Compiling libm v0.2.8 [INFO] [stderr] Compiling rustix v0.38.32 [INFO] [stderr] Checking linux-raw-sys v0.4.13 [INFO] [stderr] Checking memchr v2.7.2 [INFO] [stderr] Checking bitflags v2.5.0 [INFO] [stderr] Compiling lock_api v0.4.11 [INFO] [stderr] Compiling num-traits v0.2.18 [INFO] [stderr] Checking fastrand v2.0.2 [INFO] [stderr] Compiling slab v0.4.9 [INFO] [stderr] Checking bit-vec v0.6.3 [INFO] [stderr] Compiling quote v1.0.35 [INFO] [stderr] Checking quick-error v1.2.3 [INFO] [stderr] Checking bit-set v0.5.3 [INFO] [stderr] Checking futures-sink v0.3.30 [INFO] [stderr] Checking unarray v0.1.4 [INFO] [stderr] Checking futures-core v0.3.30 [INFO] [stderr] Compiling syn v2.0.57 [INFO] [stderr] Checking regex-syntax v0.8.3 [INFO] [stderr] Checking futures-channel v0.3.30 [INFO] [stderr] Checking predicates-core v1.0.6 [INFO] [stderr] Checking parking_lot_core v0.9.9 [INFO] [stderr] Checking signal-hook-registry v1.4.1 [INFO] [stderr] Checking mio v0.8.11 [INFO] [stderr] Checking socket2 v0.5.6 [INFO] [stderr] Checking parking_lot v0.12.1 [INFO] [stderr] Checking num_cpus v1.16.0 [INFO] [stderr] Checking getrandom v0.2.12 [INFO] [stderr] Checking wait-timeout v0.2.0 [INFO] [stderr] Compiling doc-comment v0.3.3 [INFO] [stderr] Checking futures-io v0.3.30 [INFO] [stderr] Checking rand_core v0.6.4 [INFO] [stderr] Checking futures-task v0.3.30 [INFO] [stderr] Checking difflib v0.4.0 [INFO] [stderr] Compiling assert_cmd v2.0.14 [INFO] [stderr] Checking rand_chacha v0.3.1 [INFO] [stderr] Checking rand_xorshift v0.3.0 [INFO] [stderr] Checking quicksort-proptest v0.1.0 (/opt/rustwide/workdir/ch07/quicksort-proptest) [INFO] [stderr] Checking termtree v0.4.1 [INFO] [stderr] Checking regex-automata v0.4.6 [INFO] [stderr] Checking anstyle v1.0.6 [INFO] [stderr] Checking rand v0.8.5 [INFO] [stderr] Checking predicates-tree v1.0.9 [INFO] [stderr] Checking metrohash v1.0.6 [INFO] [stderr] Checking quicksort-trait v0.1.0 (/opt/rustwide/workdir/ch07/quicksort-trait) [INFO] [stderr] Checking predicates v3.1.0 [INFO] [stderr] Checking quicksort v0.1.0 (/opt/rustwide/workdir/ch07/quicksort) [INFO] [stderr] Checking custom-hash-function v0.1.0 (/opt/rustwide/workdir/ch04/custom-hash-function) [INFO] [stderr] Checking quicksort-cli v0.1.0 (/opt/rustwide/workdir/ch07/quicksort-cli) [INFO] [stderr] Checking tempfile v3.10.1 [INFO] [stderr] Checking wrapping-adder v0.1.0 (/opt/rustwide/workdir/ch06/wrapping-adder) [INFO] [stderr] Checking zlib-example v0.1.0 (/opt/rustwide/workdir/ch04/zlib-example) [INFO] [stderr] Checking basic-allocator v0.1.0 (/opt/rustwide/workdir/ch05/basic-allocator) [INFO] [stderr] Checking mutex-guard v0.1.0 (/opt/rustwide/workdir/ch06/mutex-guard) [INFO] [stderr] Checking global-state v0.1.0 (/opt/rustwide/workdir/ch06/global-state) [INFO] [stderr] Checking singly-linked-list v0.1.0 (/opt/rustwide/workdir/ch05/singly-linked-list) [INFO] [stderr] Checking sync-sleep v0.1.0 (/opt/rustwide/workdir/ch08/sync-sleep) [INFO] [stderr] Checking doubly-linked-list v0.1.0 (/opt/rustwide/workdir/ch05/doubly-linked-list) [INFO] [stderr] Checking rusty-fork v0.3.0 [INFO] [stderr] Checking slices-and-arrays v0.1.0 (/opt/rustwide/workdir/ch04/slices-and-arrays) [INFO] [stderr] Checking pass-thru-allocator v0.1.0 (/opt/rustwide/workdir/ch05/pass-thru-allocator) [INFO] [stderr] Checking compound-key v0.1.0 (/opt/rustwide/workdir/ch04/compound-key) [INFO] [stderr] Checking unit-tests v0.1.0 (/opt/rustwide/workdir/ch06/unit-tests) [INFO] [stderr] Checking error-conversion v0.1.0 (/opt/rustwide/workdir/ch04/error-conversion) [INFO] [stderr] Checking movable-or-not v0.1.0 (/opt/rustwide/workdir/ch04/movable-or-not) [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> ch04/error-conversion/src/main.rs:7:14 [INFO] [stdout] | [INFO] [stdout] 7 | struct Error(String); [INFO] [stdout] | ----- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 7 | struct Error(()); [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking cfg-attributes v0.1.0 (/opt/rustwide/workdir/ch05/cfg-attributes) [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking integer-types v0.1.0 (/opt/rustwide/workdir/ch04/integer-types) [INFO] [stderr] Checking copies v0.1.0 (/opt/rustwide/workdir/ch05/copies) [INFO] [stderr] Checking rewriting-fizzbuzz v0.1.0 (/opt/rustwide/workdir/ch06/rewriting-fizzbuzz) [INFO] [stderr] Checking ownership v0.1.0 (/opt/rustwide/workdir/ch05/ownership) [INFO] [stderr] Checking tuple-basics v0.1.0 (/opt/rustwide/workdir/ch04/tuple-basics) [INFO] [stderr] Checking shallow-and-deep-copies v0.1.0 (/opt/rustwide/workdir/ch05/shallow-and-deep-copies) [INFO] [stderr] Checking borrowed-vec v0.1.0 (/opt/rustwide/workdir/ch04/borrowed-vec) [INFO] [stderr] Checking enums v0.1.0 (/opt/rustwide/workdir/ch04/enums) [INFO] [stderr] Checking error-handling v0.1.0 (/opt/rustwide/workdir/ch04/error-handling) [INFO] [stderr] Checking unchecked-arithmetic v0.1.0 (/opt/rustwide/workdir/ch04/unchecked-arithmetic) [INFO] [stderr] Checking wrapping-arithmetic v0.1.0 (/opt/rustwide/workdir/ch04/wrapping-arithmetic) [INFO] [stderr] Checking property-tests v0.1.0 (/opt/rustwide/workdir/ch06/property-tests) [INFO] [stderr] Checking singly-linked-list-immutable v0.1.0 (/opt/rustwide/workdir/ch05/singly-linked-list-immutable) [INFO] [stderr] Checking bstr v1.9.1 [INFO] [stderr] Checking string-wrapper v0.1.0 (/opt/rustwide/workdir/ch04/string-wrapper) [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> ch04/error-conversion/src/main.rs:7:14 [INFO] [stdout] | [INFO] [stdout] 7 | struct Error(String); [INFO] [stdout] | ----- ^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 7 | struct Error(()); [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking proptest v1.4.0 [INFO] [stderr] Compiling tokio-macros v2.2.0 [INFO] [stderr] Compiling futures-macro v0.3.30 [INFO] [stderr] Checking tokio v1.37.0 [INFO] [stderr] Checking futures-util v0.3.30 [INFO] [stderr] Checking futures-executor v0.3.30 [INFO] [stderr] Checking futures v0.3.30 [INFO] [stderr] Checking fire-and-forget v0.1.0 (/opt/rustwide/workdir/ch08/fire-and-forget) [INFO] [stderr] Checking outside-async-context v0.1.0 (/opt/rustwide/workdir/ch08/outside-async-context) [INFO] [stderr] Checking parallelism v0.1.0 (/opt/rustwide/workdir/ch08/parallelism) [INFO] [stderr] Checking wait-future-without-await v0.1.0 (/opt/rustwide/workdir/ch08/wait-future-without-await) [INFO] [stderr] Checking async-tests v0.1.0 (/opt/rustwide/workdir/ch08/async-tests) [INFO] [stderr] Checking async-sleep v0.1.0 (/opt/rustwide/workdir/ch08/async-sleep) [INFO] [stderr] Checking async-observer v0.1.0 (/opt/rustwide/workdir/ch08/async-observer) [INFO] [stderr] Checking mixed-file-io v0.1.0 (/opt/rustwide/workdir/ch08/mixed-file-io) [INFO] [stdout] warning: method `detach` is never used [INFO] [stdout] --> ch08/async-observer/src/observable.rs:8:8 [INFO] [stdout] | [INFO] [stdout] 3 | pub trait Observable { [INFO] [stdout] | ---------- method in this trait [INFO] [stdout] ... [INFO] [stdout] 8 | fn detach(&mut self, observer: Self::Observer); [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `detach` is never used [INFO] [stdout] --> ch08/async-observer/src/observable.rs:8:8 [INFO] [stdout] | [INFO] [stdout] 3 | pub trait Observable { [INFO] [stdout] | ---------- method in this trait [INFO] [stdout] ... [INFO] [stdout] 8 | fn detach(&mut self, observer: Self::Observer); [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.12s [INFO] running `Command { std: "docker" "inspect" "5f36e9e08f4f410f092dc0c6986e66287c8d0e573377d47b4d9a15289113f076", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5f36e9e08f4f410f092dc0c6986e66287c8d0e573377d47b4d9a15289113f076", kill_on_drop: false }` [INFO] [stdout] 5f36e9e08f4f410f092dc0c6986e66287c8d0e573377d47b4d9a15289113f076