[INFO] cloning repository https://github.com/ykonomi/sierpinski-triangle
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ykonomi/sierpinski-triangle" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fykonomi%2Fsierpinski-triangle", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fykonomi%2Fsierpinski-triangle'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0bc63711b01eb11737c7cf3baa083aecf63f91de
[INFO] checking ykonomi/sierpinski-triangle against try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fykonomi%2Fsierpinski-triangle" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ykonomi/sierpinski-triangle on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ykonomi/sierpinski-triangle
[INFO] finished tweaking git repo https://github.com/ykonomi/sierpinski-triangle
[INFO] tweaked toml for git repo https://github.com/ykonomi/sierpinski-triangle written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/ykonomi/sierpinski-triangle already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.43
[INFO] [stderr]   Downloaded bumpalo v2.4.1
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.43
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.43
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.43
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.43
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dcfdb55aedbdb0a1f84025e4b6682236495f2aac90f07c26c65a6ed2d7fb6499
[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" "dcfdb55aedbdb0a1f84025e4b6682236495f2aac90f07c26c65a6ed2d7fb6499", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dcfdb55aedbdb0a1f84025e4b6682236495f2aac90f07c26c65a6ed2d7fb6499", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dcfdb55aedbdb0a1f84025e4b6682236495f2aac90f07c26c65a6ed2d7fb6499", kill_on_drop: false }`
[INFO] [stdout] dcfdb55aedbdb0a1f84025e4b6682236495f2aac90f07c26c65a6ed2d7fb6499
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 546d30d93179cb6c85e6ae7a8442c3b57ecd659b18c8d9dbdff32e4cc8db7ff8
[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" "546d30d93179cb6c85e6ae7a8442c3b57ecd659b18c8d9dbdff32e4cc8db7ff8", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.4.0
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.43
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]    Compiling bumpalo v2.4.1
[INFO] [stderr]    Compiling libc v0.2.54
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling wasm-bindgen v0.2.43
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_pcg v0.1.2
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.43
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.43
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.43
[INFO] [stderr]     Checking sierpinski-triangle-generator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `rand_os::rand_core::RngCore`
[INFO] [stdout]  --> src/sierpinski_generator.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand_os::rand_core::RngCore;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand_os::OsRng`
[INFO] [stdout]  --> src/sierpinski_generator.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rand_os::OsRng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand_os::rand_core::RngCore`
[INFO] [stdout]  --> src/sierpinski_generator.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand_os::rand_core::RngCore;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand_os::OsRng`
[INFO] [stdout]  --> src/sierpinski_generator.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rand_os::OsRng;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 21.76s
[INFO] running `Command { std: "docker" "inspect" "546d30d93179cb6c85e6ae7a8442c3b57ecd659b18c8d9dbdff32e4cc8db7ff8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "546d30d93179cb6c85e6ae7a8442c3b57ecd659b18c8d9dbdff32e4cc8db7ff8", kill_on_drop: false }`
[INFO] [stdout] 546d30d93179cb6c85e6ae7a8442c3b57ecd659b18c8d9dbdff32e4cc8db7ff8