[INFO] fetching crate git-repo-manager 0.6.1...
[INFO] testing git-repo-manager-0.6.1 against 1.59.0 for beta-1.60-1
[INFO] extracting crate git-repo-manager 0.6.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate git-repo-manager 0.6.1 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate git-repo-manager 0.6.1
[INFO] finished tweaking crates.io crate git-repo-manager 0.6.1
[INFO] tweaked toml for crates.io crate git-repo-manager 0.6.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate git-repo-manager 0.6.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 685ed772fca031089eaf428994ecded37be538392160f0af5aa7eada04d4c39b
[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" "685ed772fca031089eaf428994ecded37be538392160f0af5aa7eada04d4c39b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "685ed772fca031089eaf428994ecded37be538392160f0af5aa7eada04d4c39b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "685ed772fca031089eaf428994ecded37be538392160f0af5aa7eada04d4c39b", kill_on_drop: false }`
[INFO] [stdout] 685ed772fca031089eaf428994ecded37be538392160f0af5aa7eada04d4c39b
[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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ee1fecd87b145ee650a23213a944e85cdc4efdd3cb1784f6cd041f9bc291aacf
[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" "ee1fecd87b145ee650a23213a944e85cdc4efdd3cb1784f6cd041f9bc291aacf", kill_on_drop: false }`
[INFO] [stderr]    Compiling signal-hook v0.3.13
[INFO] [stderr]    Compiling strum v0.23.0
[INFO] [stderr]    Compiling mio v0.7.14
[INFO] [stderr]    Compiling terminal_size v0.1.17
[INFO] [stderr]    Compiling libssh2-sys v0.2.23
[INFO] [stderr]    Compiling libgit2-sys v0.12.26+1.3.0
[INFO] [stderr]    Compiling strum_macros v0.23.1
[INFO] [stderr]    Compiling clap_derive v3.1.0
[INFO] [stderr]    Compiling serde_yaml v0.8.23
[INFO] [stderr]    Compiling console v0.15.0
[INFO] [stderr]    Compiling signal-hook-mio v0.2.1
[INFO] [stderr]    Compiling crossterm v0.23.0
[INFO] [stderr]    Compiling clap v3.1.1
[INFO] [stderr]    Compiling comfy-table v5.0.1
[INFO] [stderr]    Compiling git2 v0.13.25
[INFO] [stderr]    Compiling git-repo-manager v0.6.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(io_error_more)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `git-repo-manager` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "ee1fecd87b145ee650a23213a944e85cdc4efdd3cb1784f6cd041f9bc291aacf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee1fecd87b145ee650a23213a944e85cdc4efdd3cb1784f6cd041f9bc291aacf", kill_on_drop: false }`
[INFO] [stdout] ee1fecd87b145ee650a23213a944e85cdc4efdd3cb1784f6cd041f9bc291aacf