[INFO] cloning repository https://github.com/ollef/measured-splay-tree.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ollef/measured-splay-tree.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Follef%2Fmeasured-splay-tree.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Follef%2Fmeasured-splay-tree.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 87238b3b7806ea48b05f521cb805ca885e77397a
[INFO] checking ollef/measured-splay-tree.rs against master#42bd138126b0a9d38d65bc9973e72de3c5b6c37f for pr-99217
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Follef%2Fmeasured-splay-tree.rs" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ollef/measured-splay-tree.rs on toolchain 42bd138126b0a9d38d65bc9973e72de3c5b6c37f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+42bd138126b0a9d38d65bc9973e72de3c5b6c37f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ollef/measured-splay-tree.rs
[INFO] finished tweaking git repo https://github.com/ollef/measured-splay-tree.rs
[INFO] tweaked toml for git repo https://github.com/ollef/measured-splay-tree.rs written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/ollef/measured-splay-tree.rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+42bd138126b0a9d38d65bc9973e72de3c5b6c37f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:ecb52c4cf6672b83cc996368a05b4a059042425f2b6ba9cd23a06cdead5d8d70" "/opt/rustwide/cargo-home/bin/cargo" "+42bd138126b0a9d38d65bc9973e72de3c5b6c37f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a807b0c4e66c45c63d7dbce269a3096f86d564f4dc92e818ae7b6438269d441b
[INFO] running `Command { std: "docker" "start" "-a" "a807b0c4e66c45c63d7dbce269a3096f86d564f4dc92e818ae7b6438269d441b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a807b0c4e66c45c63d7dbce269a3096f86d564f4dc92e818ae7b6438269d441b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a807b0c4e66c45c63d7dbce269a3096f86d564f4dc92e818ae7b6438269d441b", kill_on_drop: false }`
[INFO] [stdout] a807b0c4e66c45c63d7dbce269a3096f86d564f4dc92e818ae7b6438269d441b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "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:ecb52c4cf6672b83cc996368a05b4a059042425f2b6ba9cd23a06cdead5d8d70" "/opt/rustwide/cargo-home/bin/cargo" "+42bd138126b0a9d38d65bc9973e72de3c5b6c37f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 52d5fa2c74584d8decbcb40a342dd175623dad3f1d0a10fcb7666642141571d2
[INFO] running `Command { std: "docker" "start" "-a" "52d5fa2c74584d8decbcb40a342dd175623dad3f1d0a10fcb7666642141571d2", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling num-complex v0.2.1
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]     Checking measured-splay-tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variants `NonMonotonic`, `LeftOf`, `RightOf` and `Inside` are never constructed
[INFO] [stdout]   --> src/main.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | enum SplitResult<M, T> {
[INFO] [stdout]    |      ----------- variants in this enum
[INFO] [stdout] 37 |     NonMonotonic(SplayTree<M, T>, SplayTree<M, T>),
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 38 |     LeftOf(SplayTree<M, T>),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 39 |     RightOf(SplayTree<M, T>),
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 40 |     Inside(SplayTreeFork<M, T>),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout]    = note: `SplitResult` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_empty` is never used
[INFO] [stdout]   --> src/main.rs:97:8
[INFO] [stdout]    |
[INFO] [stdout] 97 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `split` is never used
[INFO] [stdout]    --> src/main.rs:148:8
[INFO] [stdout]     |
[INFO] [stdout] 148 |     fn split<F: Fn(&M) -> bool>(self, pred: F) -> SplitResult<M, T> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `chars` is never used
[INFO] [stdout]    --> src/main.rs:437:8
[INFO] [stdout]     |
[INFO] [stdout] 437 |     fn chars<'a>(&'a self) -> impl Iterator<Item = char> + 'a {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `NonMonotonic`, `LeftOf`, `RightOf` and `Inside` are never constructed
[INFO] [stdout]   --> src/main.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | enum SplitResult<M, T> {
[INFO] [stdout]    |      ----------- variants in this enum
[INFO] [stdout] 37 |     NonMonotonic(SplayTree<M, T>, SplayTree<M, T>),
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 38 |     LeftOf(SplayTree<M, T>),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 39 |     RightOf(SplayTree<M, T>),
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 40 |     Inside(SplayTreeFork<M, T>),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout]    = note: `SplitResult` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `is_empty` is never used
[INFO] [stdout]   --> src/main.rs:97:8
[INFO] [stdout]    |
[INFO] [stdout] 97 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `split` is never used
[INFO] [stdout]    --> src/main.rs:148:8
[INFO] [stdout]     |
[INFO] [stdout] 148 |     fn split<F: Fn(&M) -> bool>(self, pred: F) -> SplitResult<M, T> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `chars` is never used
[INFO] [stdout]    --> src/main.rs:437:8
[INFO] [stdout]     |
[INFO] [stdout] 437 |     fn chars<'a>(&'a self) -> impl Iterator<Item = char> + 'a {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.20s
[INFO] running `Command { std: "docker" "inspect" "52d5fa2c74584d8decbcb40a342dd175623dad3f1d0a10fcb7666642141571d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52d5fa2c74584d8decbcb40a342dd175623dad3f1d0a10fcb7666642141571d2", kill_on_drop: false }`
[INFO] [stdout] 52d5fa2c74584d8decbcb40a342dd175623dad3f1d0a10fcb7666642141571d2