[INFO] cloning repository https://github.com/spaarmann/cluster-editing
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/spaarmann/cluster-editing" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspaarmann%2Fcluster-editing", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspaarmann%2Fcluster-editing'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5415450450d6d502b43101e23c26c390e02f5dd7
[INFO] testing spaarmann/cluster-editing against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspaarmann%2Fcluster-editing" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/spaarmann/cluster-editing on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-8/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/spaarmann/cluster-editing
[INFO] finished tweaking git repo https://github.com/spaarmann/cluster-editing
[INFO] tweaked toml for git repo https://github.com/spaarmann/cluster-editing written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/spaarmann/cluster-editing already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v1.0.55
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2703f02d5d39e97a0a0ce3d7207f26e3c563b5cfa3865c4e625e697699d40dfd
[INFO] running `Command { std: "docker" "start" "-a" "2703f02d5d39e97a0a0ce3d7207f26e3c563b5cfa3865c4e625e697699d40dfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2703f02d5d39e97a0a0ce3d7207f26e3c563b5cfa3865c4e625e697699d40dfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2703f02d5d39e97a0a0ce3d7207f26e3c563b5cfa3865c4e625e697699d40dfd", kill_on_drop: false }`
[INFO] [stdout] 2703f02d5d39e97a0a0ce3d7207f26e3c563b5cfa3865c4e625e697699d40dfd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3645858f6d16f63b6e6f2ff0095196d055efa7288a2dda760c1e0757d8839926
[INFO] running `Command { std: "docker" "start" "-a" "3645858f6d16f63b6e6f2ff0095196d055efa7288a2dda760c1e0757d8839926", kill_on_drop: false }`
[INFO] [stderr]    Compiling const_fn v0.4.5
[INFO] [stderr]    Compiling syn v1.0.55
[INFO] [stderr]    Compiling humantime v2.0.1
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling petgraph v0.5.1
[INFO] [stderr]    Compiling wait-timeout v0.2.0
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling env_logger v0.8.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.1
[INFO] [stderr]    Compiling crossbeam-channel v0.5.0
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling structopt-derive v0.4.14
[INFO] [stderr]    Compiling structopt v0.3.21
[INFO] [stderr]    Compiling cluster-editing v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `r123_neighbors_u`
[INFO] [stdout]   --> src/reduction.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     r123_neighbors_u: Vec<(usize, Weight)>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `ReductionStorage` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/reduction.rs:13:10
[INFO] [stdout]    |
[INFO] [stdout] 13 | #[derive(Clone, Debug, Default)]
[INFO] [stdout]    |          ^^^^^  ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `r123_neighbors_v`
[INFO] [stdout]   --> src/reduction.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     r123_neighbors_v: Vec<(usize, Weight)>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `ReductionStorage` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/reduction.rs:13:10
[INFO] [stdout]    |
[INFO] [stdout] 13 | #[derive(Clone, Debug, Default)]
[INFO] [stdout]    |          ^^^^^  ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `r123_neighbors_u_new`
[INFO] [stdout]   --> src/reduction.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     r123_neighbors_u_new: Vec<(usize, Weight)>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `ReductionStorage` has derived impls for the traits `Debug` and `Clone`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/reduction.rs:13:10
[INFO] [stdout]    |
[INFO] [stdout] 13 | #[derive(Clone, Debug, Default)]
[INFO] [stdout]    |          ^^^^^  ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[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(map_first_last)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(binary_heap_retain)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cluster-editing` due to 3 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "3645858f6d16f63b6e6f2ff0095196d055efa7288a2dda760c1e0757d8839926", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3645858f6d16f63b6e6f2ff0095196d055efa7288a2dda760c1e0757d8839926", kill_on_drop: false }`
[INFO] [stdout] 3645858f6d16f63b6e6f2ff0095196d055efa7288a2dda760c1e0757d8839926