[INFO] cloning repository https://github.com/DrKwint/r2048
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/DrKwint/r2048" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDrKwint%2Fr2048", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDrKwint%2Fr2048'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6fcd24f91959da93dcb8b11055c35653f2fa947c
[INFO] checking DrKwint/r2048 against try#9cfe725f0995b018340c519db1b2f3cf8a7e0631 for pr-81174
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDrKwint%2Fr2048" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/DrKwint/r2048 on toolchain 9cfe725f0995b018340c519db1b2f3cf8a7e0631
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-6/source/.cargo/config
[INFO] started tweaking git repo https://github.com/DrKwint/r2048
[INFO] finished tweaking git repo https://github.com/DrKwint/r2048
[INFO] tweaked toml for git repo https://github.com/DrKwint/r2048 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/DrKwint/r2048 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded inventory v0.1.9
[INFO] [stderr]   Downloaded indoc v0.3.6
[INFO] [stderr]   Downloaded ctor v0.1.16
[INFO] [stderr]   Downloaded indoc-impl v0.3.6
[INFO] [stderr]   Downloaded inventory-impl v0.1.9
[INFO] [stderr]   Downloaded unindent v0.1.7
[INFO] [stderr]   Downloaded pyo3cls v0.12.3
[INFO] [stderr]   Downloaded pyo3-derive-backend v0.12.3
[INFO] [stderr]   Downloaded pyo3 v0.12.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bf20813b1bd16b9b012fb3c3217898963b42d0fcfbb0f7b8979e4198e1df8efb
[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" "bf20813b1bd16b9b012fb3c3217898963b42d0fcfbb0f7b8979e4198e1df8efb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bf20813b1bd16b9b012fb3c3217898963b42d0fcfbb0f7b8979e4198e1df8efb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf20813b1bd16b9b012fb3c3217898963b42d0fcfbb0f7b8979e4198e1df8efb", kill_on_drop: false }`
[INFO] [stdout] bf20813b1bd16b9b012fb3c3217898963b42d0fcfbb0f7b8979e4198e1df8efb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 580ac2bf19ec7b39c5b4619e6e88b151cc245d0f4f68086c81eea63b26d31e1e
[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" "580ac2bf19ec7b39c5b4619e6e88b151cc245d0f4f68086c81eea63b26d31e1e", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]     Checking smallvec v1.5.0
[INFO] [stderr]    Compiling unindent v0.1.7
[INFO] [stderr]    Compiling pyo3 v0.12.3
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]    Compiling inventory v0.1.9
[INFO] [stderr]     Checking lock_api v0.4.2
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]     Checking paste v0.1.18
[INFO] [stderr]     Checking getrandom v0.1.15
[INFO] [stderr]     Checking parking_lot_core v0.8.0
[INFO] [stderr]     Checking num-complex v0.3.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking num-bigint v0.3.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking num v0.3.1
[INFO] [stderr]    Compiling pyo3-derive-backend v0.12.3
[INFO] [stderr]    Compiling ghost v0.1.2
[INFO] [stderr]    Compiling inventory-impl v0.1.9
[INFO] [stderr]    Compiling ctor v0.1.16
[INFO] [stderr]    Compiling indoc-impl v0.3.6
[INFO] [stderr]    Compiling pyo3cls v0.12.3
[INFO] [stderr]     Checking indoc v0.3.6
[INFO] [stderr]     Checking r2048 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `done` is never read
[INFO] [stdout]   --> src/lib.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |         let mut done = false;
[INFO] [stdout]    |             ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `done` is never read
[INFO] [stdout]   --> src/lib.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |         let mut done = false;
[INFO] [stdout]    |             ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]    --> src/lib.rs:315:4
[INFO] [stdout]     |
[INFO] [stdout] 315 | fn main() {
[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: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 00s
[INFO] running `Command { std: "docker" "inspect" "580ac2bf19ec7b39c5b4619e6e88b151cc245d0f4f68086c81eea63b26d31e1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "580ac2bf19ec7b39c5b4619e6e88b151cc245d0f4f68086c81eea63b26d31e1e", kill_on_drop: false }`
[INFO] [stdout] 580ac2bf19ec7b39c5b4619e6e88b151cc245d0f4f68086c81eea63b26d31e1e