[INFO] cloning repository https://github.com/antonmisa/rust_combinators_vs_return
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/antonmisa/rust_combinators_vs_return" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fantonmisa%2Frust_combinators_vs_return", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fantonmisa%2Frust_combinators_vs_return'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2fb7b6d79f29f6912ee698a06ac2aea407b0edd9
[INFO] checking antonmisa/rust_combinators_vs_return against master#8007b506ac5da629f223b755f5a5391edd5f6d01 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fantonmisa%2Frust_combinators_vs_return" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/antonmisa/rust_combinators_vs_return on toolchain 8007b506ac5da629f223b755f5a5391edd5f6d01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/antonmisa/rust_combinators_vs_return
[INFO] finished tweaking git repo https://github.com/antonmisa/rust_combinators_vs_return
[INFO] tweaked toml for git repo https://github.com/antonmisa/rust_combinators_vs_return written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/antonmisa/rust_combinators_vs_return already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8aa4ea36cbcb004ddd504075d7bf517c5122880a4088e5cec6ec9852ee0e981f
[INFO] running `Command { std: "docker" "start" "-a" "8aa4ea36cbcb004ddd504075d7bf517c5122880a4088e5cec6ec9852ee0e981f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8aa4ea36cbcb004ddd504075d7bf517c5122880a4088e5cec6ec9852ee0e981f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8aa4ea36cbcb004ddd504075d7bf517c5122880a4088e5cec6ec9852ee0e981f", kill_on_drop: false }`
[INFO] [stdout] 8aa4ea36cbcb004ddd504075d7bf517c5122880a4088e5cec6ec9852ee0e981f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 98f131d46ee4be49fcdead42684a48a396d1b45bfcfc8a7c2a52f9917fb4bf32
[INFO] running `Command { std: "docker" "start" "-a" "98f131d46ee4be49fcdead42684a48a396d1b45bfcfc8a7c2a52f9917fb4bf32", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking combination v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.15s
[INFO] running `Command { std: "docker" "inspect" "98f131d46ee4be49fcdead42684a48a396d1b45bfcfc8a7c2a52f9917fb4bf32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98f131d46ee4be49fcdead42684a48a396d1b45bfcfc8a7c2a52f9917fb4bf32", kill_on_drop: false }`
[INFO] [stdout] 98f131d46ee4be49fcdead42684a48a396d1b45bfcfc8a7c2a52f9917fb4bf32