[INFO] cloning repository https://github.com/danieljharris/dev_playground_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/danieljharris/dev_playground_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanieljharris%2Fdev_playground_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanieljharris%2Fdev_playground_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 69a72543f346e4ef90b9bdcc5f599f2ff77737c5
[INFO] checking danieljharris/dev_playground_rust against master#fffed276b51cf514622e8d3109d620501cc01670 for pr-134021
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanieljharris%2Fdev_playground_rust" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/danieljharris/dev_playground_rust
[INFO] finished tweaking git repo https://github.com/danieljharris/dev_playground_rust
[INFO] tweaked toml for git repo https://github.com/danieljharris/dev_playground_rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/danieljharris/dev_playground_rust on toolchain fffed276b51cf514622e8d3109d620501cc01670
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fffed276b51cf514622e8d3109d620501cc01670" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/danieljharris/dev_playground_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fffed276b51cf514622e8d3109d620501cc01670" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[INFO] [stderr]  Downloading crates ...
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 986d72956090aa5a6a2496c9dda253b53680694197bc6999e8c13b3b1d65da78
[INFO] running `Command { std: "docker" "start" "986d72956090aa5a6a2496c9dda253b53680694197bc6999e8c13b3b1d65da78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "986d72956090aa5a6a2496c9dda253b53680694197bc6999e8c13b3b1d65da78" "/opt/rustwide/cargo-home/bin/cargo" "+fffed276b51cf514622e8d3109d620501cc01670" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "986d72956090aa5a6a2496c9dda253b53680694197bc6999e8c13b3b1d65da78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "986d72956090aa5a6a2496c9dda253b53680694197bc6999e8c13b3b1d65da78" "/opt/rustwide/cargo-home/bin/cargo" "+fffed276b51cf514622e8d3109d620501cc01670" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.177
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[INFO] [stderr]     Checking byteorder v1.5.0
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[INFO] [stderr]    Compiling openssl-sys v0.9.110
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[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking num_cpus v1.17.0
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[INFO] [stderr]    Compiling openssl-macros v0.1.1
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[INFO] [stderr]     Checking websocket-base v0.26.5
[INFO] [stderr]     Checking websocket v0.27.1
[INFO] [stderr]     Checking dev_playground_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: feature `explicit_tail_calls` is declared but not used
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(explicit_tail_calls)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_features)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: feature `explicit_tail_calls` is declared but not used
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(explicit_tail_calls)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_features)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 18.35s
[INFO] running `Command { std: "docker" "inspect" "986d72956090aa5a6a2496c9dda253b53680694197bc6999e8c13b3b1d65da78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "986d72956090aa5a6a2496c9dda253b53680694197bc6999e8c13b3b1d65da78", kill_on_drop: false }`
[INFO] [stdout] 986d72956090aa5a6a2496c9dda253b53680694197bc6999e8c13b3b1d65da78
