[INFO] cloning repository https://github.com/ccdle12/rust-big-num
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ccdle12/rust-big-num" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fccdle12%2Frust-big-num", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fccdle12%2Frust-big-num'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c00a9bc5319287c7b947a85f2827bc70ac155c42
[INFO] checking ccdle12/rust-big-num against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fccdle12%2Frust-big-num" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ccdle12/rust-big-num on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ccdle12/rust-big-num
[INFO] finished tweaking git repo https://github.com/ccdle12/rust-big-num
[INFO] tweaked toml for git repo https://github.com/ccdle12/rust-big-num written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/ccdle12/rust-big-num already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 395816c38a166f261703117f3d4930e29b6f83004ea28a2ea3ef651e0c877d3c
[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" "395816c38a166f261703117f3d4930e29b6f83004ea28a2ea3ef651e0c877d3c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "395816c38a166f261703117f3d4930e29b6f83004ea28a2ea3ef651e0c877d3c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "395816c38a166f261703117f3d4930e29b6f83004ea28a2ea3ef651e0c877d3c", kill_on_drop: false }`
[INFO] [stdout] 395816c38a166f261703117f3d4930e29b6f83004ea28a2ea3ef651e0c877d3c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 54c8d7378336f7ba611863e37d7a5676a9b0ccc3daf3812c3b8c88ad63498574
[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" "54c8d7378336f7ba611863e37d7a5676a9b0ccc3daf3812c3b8c88ad63498574", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]     Checking rand_jitter v0.1.3
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rust_big_num v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/big_digit.rs:163:25
[INFO] [stdout]     |
[INFO] [stdout] 163 | pub fn div(x: BigDigit, mut y: BigDigit) -> BigDigit {
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/big_digit.rs:164:10
[INFO] [stdout]     |
[INFO] [stdout] 164 |     let (mut dividend, mut divisor) = (x, y);
[INFO] [stdout]     |          ----^^^^^^^^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/big_digit.rs:163:25
[INFO] [stdout]     |
[INFO] [stdout] 163 | pub fn div(x: BigDigit, mut y: BigDigit) -> BigDigit {
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/big_digit.rs:164:10
[INFO] [stdout]     |
[INFO] [stdout] 164 |     let (mut dividend, mut divisor) = (x, y);
[INFO] [stdout]     |          ----^^^^^^^^
[INFO] [stdout]     |          |
[INFO] [stdout]     |          help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.04s
[INFO] running `Command { std: "docker" "inspect" "54c8d7378336f7ba611863e37d7a5676a9b0ccc3daf3812c3b8c88ad63498574", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54c8d7378336f7ba611863e37d7a5676a9b0ccc3daf3812c3b8c88ad63498574", kill_on_drop: false }`
[INFO] [stdout] 54c8d7378336f7ba611863e37d7a5676a9b0ccc3daf3812c3b8c88ad63498574