[INFO] fetching crate rustversion 1.0.8...
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] crate rustversion 1.0.8 is already in cache
[INFO] checking rustversion-1.0.8 against try#a8425075041d4b9af9bf32e2a267dfb9db2cfffb for pr-100043
[INFO] extracting crate rustversion 1.0.8 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate rustversion 1.0.8 on toolchain a8425075041d4b9af9bf32e2a267dfb9db2cfffb
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a8425075041d4b9af9bf32e2a267dfb9db2cfffb" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rustversion 1.0.8
[INFO] finished tweaking crates.io crate rustversion 1.0.8
[INFO] tweaked toml for crates.io crate rustversion 1.0.8 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a8425075041d4b9af9bf32e2a267dfb9db2cfffb" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a8425075041d4b9af9bf32e2a267dfb9db2cfffb" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:ecb52c4cf6672b83cc996368a05b4a059042425f2b6ba9cd23a06cdead5d8d70" "/opt/rustwide/cargo-home/bin/cargo" "+a8425075041d4b9af9bf32e2a267dfb9db2cfffb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 19ef0f7db422175a9fed34287f8f202410db04f8ef6fce9ee077f25ddbb83e92
[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" "19ef0f7db422175a9fed34287f8f202410db04f8ef6fce9ee077f25ddbb83e92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19ef0f7db422175a9fed34287f8f202410db04f8ef6fce9ee077f25ddbb83e92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19ef0f7db422175a9fed34287f8f202410db04f8ef6fce9ee077f25ddbb83e92", kill_on_drop: false }`
[INFO] [stdout] 19ef0f7db422175a9fed34287f8f202410db04f8ef6fce9ee077f25ddbb83e92
[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" "RUSTDOCFLAGS=--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" "+a8425075041d4b9af9bf32e2a267dfb9db2cfffb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9f73506b523aa2211cd0bd90f0a20dde6c46d21743baf71cb4bab954ff3a2eae
[INFO] running `Command { std: "docker" "start" "-a" "9f73506b523aa2211cd0bd90f0a20dde6c46d21743baf71cb4bab954ff3a2eae", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.43
[INFO] [stderr]    Compiling serde v1.0.142
[INFO] [stderr]    Compiling unicode-ident v1.0.3
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling serde_derive v1.0.142
[INFO] [stderr]    Compiling serde_json v1.0.83
[INFO] [stderr]    Compiling rustversion v1.0.8 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling trybuild v1.0.64
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]     Checking itoa v1.0.3
[INFO] [stderr]     Checking dissimilar v1.0.4
[INFO] [stderr]     Checking once_cell v1.13.0
[INFO] [stderr]     Checking glob v0.3.0
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr] error: failed to run custom build command for `rustversion v1.0.8 (/opt/rustwide/workdir)`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/rustversion-8b200cbc129862fd/build-script-build` (exit status: 1)
[INFO] [stderr]   --- stderr
[INFO] [stderr]   Error: unexpected output from `rustc --version`: ""
[INFO] [stderr] 
[INFO] [stderr]   Please file an issue in https://github.com/dtolnay/rustversion
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "9f73506b523aa2211cd0bd90f0a20dde6c46d21743baf71cb4bab954ff3a2eae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f73506b523aa2211cd0bd90f0a20dde6c46d21743baf71cb4bab954ff3a2eae", kill_on_drop: false }`
[INFO] [stdout] 9f73506b523aa2211cd0bd90f0a20dde6c46d21743baf71cb4bab954ff3a2eae