[INFO] cloning repository https://github.com/unlearnt/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/unlearnt/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funlearnt%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funlearnt%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7146c21135c5bcecd9e3f8586467f9aec5aa92bc
[INFO] checking unlearnt/rust-playground against try#8a0378607d6b34c242e3bfa75554871be641864b for pr-143028
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funlearnt%2Frust-playground" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] [stderr] Updating files:  71% (1265/1763)
Updating files:  72% (1270/1763)
Updating files:  73% (1287/1763)
Updating files:  74% (1305/1763)
Updating files:  75% (1323/1763)
Updating files:  76% (1340/1763)
Updating files:  77% (1358/1763)
Updating files:  78% (1376/1763)
Updating files:  79% (1393/1763)
Updating files:  80% (1411/1763)
Updating files:  81% (1429/1763)
Updating files:  82% (1446/1763)
Updating files:  83% (1464/1763)
Updating files:  84% (1481/1763)
Updating files:  85% (1499/1763)
Updating files:  86% (1517/1763)
Updating files:  87% (1534/1763)
Updating files:  88% (1552/1763)
Updating files:  89% (1570/1763)
Updating files:  90% (1587/1763)
Updating files:  91% (1605/1763)
Updating files:  92% (1622/1763)
Updating files:  93% (1640/1763)
Updating files:  94% (1658/1763)
Updating files:  95% (1675/1763)
Updating files:  96% (1693/1763)
Updating files:  97% (1711/1763)
Updating files:  98% (1728/1763)
Updating files:  99% (1746/1763)
Updating files: 100% (1763/1763)
Updating files: 100% (1763/1763), done.
[INFO] started tweaking git repo https://github.com/unlearnt/rust-playground
[INFO] finished tweaking git repo https://github.com/unlearnt/rust-playground
[INFO] tweaked toml for git repo https://github.com/unlearnt/rust-playground written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/unlearnt/rust-playground on toolchain 8a0378607d6b34c242e3bfa75554871be641864b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a0378607d6b34c242e3bfa75554871be641864b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/unlearnt/rust-playground 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" "+8a0378607d6b34c242e3bfa75554871be641864b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8a0378607d6b34c242e3bfa75554871be641864b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 76e5d7887c9f4eeb6b9edad772639544ed38d3f1723445bd91721a5516c26f0d
[INFO] running `Command { std: "docker" "start" "-a" "76e5d7887c9f4eeb6b9edad772639544ed38d3f1723445bd91721a5516c26f0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "76e5d7887c9f4eeb6b9edad772639544ed38d3f1723445bd91721a5516c26f0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76e5d7887c9f4eeb6b9edad772639544ed38d3f1723445bd91721a5516c26f0d", kill_on_drop: false }`
[INFO] [stdout] 76e5d7887c9f4eeb6b9edad772639544ed38d3f1723445bd91721a5516c26f0d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8a0378607d6b34c242e3bfa75554871be641864b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5081ab7c2e452cf41c8a03f751c9ad30157c4d74f3d1ac95f342bf29d3f2f840
[INFO] running `Command { std: "docker" "start" "-a" "5081ab7c2e452cf41c8a03f751c9ad30157c4d74f3d1ac95f342bf29d3f2f840", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "5081ab7c2e452cf41c8a03f751c9ad30157c4d74f3d1ac95f342bf29d3f2f840", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5081ab7c2e452cf41c8a03f751c9ad30157c4d74f3d1ac95f342bf29d3f2f840", kill_on_drop: false }`
[INFO] [stdout] 5081ab7c2e452cf41c8a03f751c9ad30157c4d74f3d1ac95f342bf29d3f2f840