[INFO] cloning repository https://github.com/devanbenz/skiplist-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/devanbenz/skiplist-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdevanbenz%2Fskiplist-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdevanbenz%2Fskiplist-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 839a7c29eb6d2d3cda8fcf07b0264797d8b1f5c1
[INFO] testing devanbenz/skiplist-rs against beta-2026-04-21 for beta-1.96-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdevanbenz%2Fskiplist-rs" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/devanbenz/skiplist-rs
[INFO] finished tweaking git repo https://github.com/devanbenz/skiplist-rs
[INFO] tweaked toml for git repo https://github.com/devanbenz/skiplist-rs written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/devanbenz/skiplist-rs on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/devanbenz/skiplist-rs 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" "+beta-2026-04-21" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c8684d7c23be9fa7fd653ff3239341fc05fcf7523cd15944f3f6eea536fbb05b
[INFO] running `Command { std: "docker" "start" "-a" "c8684d7c23be9fa7fd653ff3239341fc05fcf7523cd15944f3f6eea536fbb05b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c8684d7c23be9fa7fd653ff3239341fc05fcf7523cd15944f3f6eea536fbb05b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8684d7c23be9fa7fd653ff3239341fc05fcf7523cd15944f3f6eea536fbb05b", kill_on_drop: false }`
[INFO] [stdout] c8684d7c23be9fa7fd653ff3239341fc05fcf7523cd15944f3f6eea536fbb05b
[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=warn" "-e" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8f3524de09dda4d780843346dc666116102d9b347757f08e32ddaaf624eaf54c
[INFO] running `Command { std: "docker" "start" "-a" "8f3524de09dda4d780843346dc666116102d9b347757f08e32ddaaf624eaf54c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.178
[INFO] [stderr]    Compiling zerocopy v0.8.31
[INFO] [stderr]    Compiling proc-macro2 v1.0.103
[INFO] [stderr]    Compiling rustix v1.1.3
[INFO] [stderr]    Compiling quote v1.0.42
[INFO] [stderr]    Compiling unicode-ident v1.0.22
[INFO] [stderr]    Compiling clap_lex v0.7.6
[INFO] [stderr]    Compiling condtype v1.3.0
[INFO] [stderr]    Compiling regex-lite v0.1.8
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.18
[INFO] [stderr]    Compiling syn v2.0.111
[INFO] [stderr]    Compiling getrandom v0.2.17
[INFO] [stderr]    Compiling getrandom v0.3.4
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_core v0.9.3
[INFO] [stderr]    Compiling terminal_size v0.4.3
[INFO] [stderr]    Compiling clap_builder v4.5.53
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand_chacha v0.9.0
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling rand v0.9.2
[INFO] [stderr]    Compiling divan-macros v0.1.21
[INFO] [stderr]    Compiling skiplist-rs v0.1.5
[INFO] [stderr]    Compiling clap v4.5.53
[INFO] [stderr]    Compiling divan v0.1.21
[INFO] [stderr]    Compiling ibis-skiplist v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `level` is never read
[INFO] [stdout]   --> src/skiplist.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct Node<K, V, const N: usize> {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 30 |     level: usize,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 14.57s
[INFO] running `Command { std: "docker" "inspect" "8f3524de09dda4d780843346dc666116102d9b347757f08e32ddaaf624eaf54c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f3524de09dda4d780843346dc666116102d9b347757f08e32ddaaf624eaf54c", kill_on_drop: false }`
[INFO] [stdout] 8f3524de09dda4d780843346dc666116102d9b347757f08e32ddaaf624eaf54c
[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=warn" "-e" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 99bf1621b39339fb81356472dd23f8944359e36a53cf8f2c4ddc811037777d1f
[INFO] running `Command { std: "docker" "start" "-a" "99bf1621b39339fb81356472dd23f8944359e36a53cf8f2c4ddc811037777d1f", kill_on_drop: false }`
[INFO] [stdout] warning: field `level` is never read
[INFO] [stdout]   --> src/skiplist.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct Node<K, V, const N: usize> {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 30 |     level: usize,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling ibis-skiplist v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `level` is never read
[INFO] [stdout]   --> src/skiplist.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct Node<K, V, const N: usize> {
[INFO] [stdout]    |        ---- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 30 |     level: usize,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `Command { std: "docker" "inspect" "99bf1621b39339fb81356472dd23f8944359e36a53cf8f2c4ddc811037777d1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99bf1621b39339fb81356472dd23f8944359e36a53cf8f2c4ddc811037777d1f", kill_on_drop: false }`
[INFO] [stdout] 99bf1621b39339fb81356472dd23f8944359e36a53cf8f2c4ddc811037777d1f
[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=warn" "-e" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3e321b0f8495c614f6a9b69e977e73766bf71240b0b1ca55e721d2f10d5df8bc
[INFO] running `Command { std: "docker" "start" "-a" "3e321b0f8495c614f6a9b69e977e73766bf71240b0b1ca55e721d2f10d5df8bc", kill_on_drop: false }`
[INFO] [stderr] warning: field `level` is never read
[INFO] [stderr]   --> src/skiplist.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 27 | struct Node<K, V, const N: usize> {
[INFO] [stderr]    |        ---- field in this struct
[INFO] [stderr] ...
[INFO] [stderr] 30 |     level: usize,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `ibis-skiplist` (lib) generated 1 warning
[INFO] [stderr] warning: `ibis-skiplist` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/ibis_skiplist-68855da054060bd9)
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test skiplist::skiplist_tests::skiplist_insert_and_get ... ok
[INFO] [stdout] test skiplist::skiplist_tests::new_skiplist ... ok
[INFO] [stdout] test skiplist::skiplist_tests::skiplist_same_key_insert ... ok
[INFO] [stdout] test skiplist::skiplist_tests::insert_then_get_visibility ... ok
[INFO] [stdout] test skiplist::skiplist_tests::concurrent_same_key_no_duplicates ... ok
[INFO] [stdout] test skiplist::skiplist_tests::concurrent_unique_keys ... ok
[INFO] [stderr]    Doc-tests ibis_skiplist
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.06s
[INFO] [stdout] 
[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" "3e321b0f8495c614f6a9b69e977e73766bf71240b0b1ca55e721d2f10d5df8bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e321b0f8495c614f6a9b69e977e73766bf71240b0b1ca55e721d2f10d5df8bc", kill_on_drop: false }`
[INFO] [stdout] 3e321b0f8495c614f6a9b69e977e73766bf71240b0b1ca55e721d2f10d5df8bc