[INFO] updating cached repository https://github.com/stephen-lazaro/reuler
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fe82e9aab2bfce29c3107a4d10ed7bae9ae39908
[INFO] testing stephen-lazaro/reuler against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstephen-lazaro%2Freuler" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/stephen-lazaro/reuler on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/stephen-lazaro/reuler
[INFO] finished tweaking git repo https://github.com/stephen-lazaro/reuler
[INFO] tweaked toml for git repo https://github.com/stephen-lazaro/reuler written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/stephen-lazaro/reuler already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "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] fbcf23030d9c378553018e3a378ef17f29170f05a92d13545fd5293bb78c13c5
[INFO] running `Command { std: "docker" "start" "-a" "fbcf23030d9c378553018e3a378ef17f29170f05a92d13545fd5293bb78c13c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fbcf23030d9c378553018e3a378ef17f29170f05a92d13545fd5293bb78c13c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fbcf23030d9c378553018e3a378ef17f29170f05a92d13545fd5293bb78c13c5", kill_on_drop: false }`
[INFO] [stdout] fbcf23030d9c378553018e3a378ef17f29170f05a92d13545fd5293bb78c13c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a1b56692030dfbb7693988e5c114a5e5c5927a94bb077a99d948c3906e4bacef
[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" "a1b56692030dfbb7693988e5c114a5e5c5927a94bb077a99d948c3906e4bacef", kill_on_drop: false }`
[INFO] [stderr]    Compiling either v1.4.0
[INFO] [stderr]    Compiling itertools v0.7.3
[INFO] [stderr]    Compiling reuler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unknown lint: `unused_import`
[INFO] [stdout]  --> src/lib.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | #[allow(unused_import)]
[INFO] [stdout]   |         ^^^^^^^^^^^^^ help: did you mean: `unused_imports`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unknown_lints)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unknown lint: `unused_import`
[INFO] [stdout]  --> src/lib.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | #[allow(unused_import)]
[INFO] [stdout]   |         ^^^^^^^^^^^^^ help: did you mean: `unused_imports`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(inclusive_range_syntax)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(iterator_step_by)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #[macro_use] extern crate itertools;
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[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 `reuler`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "a1b56692030dfbb7693988e5c114a5e5c5927a94bb077a99d948c3906e4bacef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1b56692030dfbb7693988e5c114a5e5c5927a94bb077a99d948c3906e4bacef", kill_on_drop: false }`
[INFO] [stdout] a1b56692030dfbb7693988e5c114a5e5c5927a94bb077a99d948c3906e4bacef