[INFO] cloning repository https://github.com/gibsonjareds/project-euler
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gibsonjareds/project-euler" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgibsonjareds%2Fproject-euler", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgibsonjareds%2Fproject-euler'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5746e281114a09a78d1073808eaef69537a4876a
[INFO] checking gibsonjareds/project-euler against try#6284d7b4bd27983dba388146648ab844ca7d032f for pr-152971
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgibsonjareds%2Fproject-euler" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/gibsonjareds/project-euler
[INFO] finished tweaking git repo https://github.com/gibsonjareds/project-euler
[INFO] tweaked toml for git repo https://github.com/gibsonjareds/project-euler written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/gibsonjareds/project-euler on toolchain 6284d7b4bd27983dba388146648ab844ca7d032f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6284d7b4bd27983dba388146648ab844ca7d032f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/gibsonjareds/project-euler 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" "+6284d7b4bd27983dba388146648ab844ca7d032f" "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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+6284d7b4bd27983dba388146648ab844ca7d032f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 816af533816d1b371bed9258c7a5fd1e5e44b8a05b17bbe98ae2d9d4dca07353
[INFO] running `Command { std: "docker" "start" "-a" "816af533816d1b371bed9258c7a5fd1e5e44b8a05b17bbe98ae2d9d4dca07353", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "816af533816d1b371bed9258c7a5fd1e5e44b8a05b17bbe98ae2d9d4dca07353", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "816af533816d1b371bed9258c7a5fd1e5e44b8a05b17bbe98ae2d9d4dca07353", kill_on_drop: false }`
[INFO] [stdout] 816af533816d1b371bed9258c7a5fd1e5e44b8a05b17bbe98ae2d9d4dca07353
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+6284d7b4bd27983dba388146648ab844ca7d032f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 00d25f5b47f72b00f9cda716a83bc8b5520187afbc36034d4a9061b0539d7fac
[INFO] running `Command { std: "docker" "start" "-a" "00d25f5b47f72b00f9cda716a83bc8b5520187afbc36034d4a9061b0539d7fac", kill_on_drop: false }`
[INFO] [stderr]     Checking utils v0.0.1 (/opt/rustwide/workdir/src/utils)
[INFO] [stderr]     Checking problem6 v0.0.1 (/opt/rustwide/workdir/src/problem6)
[INFO] [stderr]     Checking problem2 v0.0.1 (/opt/rustwide/workdir/src/problem2)
[INFO] [stderr]     Checking problem4 v0.0.1 (/opt/rustwide/workdir/src/problem4)
[INFO] [stderr]     Checking problem1 v0.0.1 (/opt/rustwide/workdir/src/problem1)
[INFO] [stdout] error[E0635]: unknown feature `drain_filter`
[INFO] [stdout]  --> src/utils/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] help: there is a feature with a similar name: `option_filter`
[INFO] [stdout]   |
[INFO] [stdout] 1 - #![feature(drain_filter)]
[INFO] [stdout] 1 + #![feature(option_filter)]
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `utils` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "00d25f5b47f72b00f9cda716a83bc8b5520187afbc36034d4a9061b0539d7fac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00d25f5b47f72b00f9cda716a83bc8b5520187afbc36034d4a9061b0539d7fac", kill_on_drop: false }`
[INFO] [stdout] 00d25f5b47f72b00f9cda716a83bc8b5520187afbc36034d4a9061b0539d7fac