[INFO] cloning repository https://github.com/caente/coursera_graphs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/caente/coursera_graphs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaente%2Fcoursera_graphs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaente%2Fcoursera_graphs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a9816c0618c7bdf018b1cbc44f7bbf39fa88bc6a
[INFO] testing caente/coursera_graphs against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaente%2Fcoursera_graphs" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] [stderr] Updating files:  32% (8/25)
Updating files:  36% (9/25)
Updating files:  40% (10/25)
Updating files:  44% (11/25)
Updating files:  48% (12/25)
Updating files:  52% (13/25)
Updating files:  56% (14/25)
Updating files:  60% (15/25)
Updating files:  64% (16/25)
Updating files:  68% (17/25)
Updating files:  72% (18/25)
Updating files:  76% (19/25)
Updating files:  80% (20/25)
Updating files:  84% (21/25)
Updating files:  88% (22/25)
Updating files:  92% (23/25)
Updating files:  96% (24/25)
Updating files: 100% (25/25)
Updating files: 100% (25/25), done.
[INFO] validating manifest of git repo https://github.com/caente/coursera_graphs on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/caente/coursera_graphs
[INFO] finished tweaking git repo https://github.com/caente/coursera_graphs
[INFO] tweaked toml for git repo https://github.com/caente/coursera_graphs written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/caente/coursera_graphs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7e3a7234dd42936d3c1b88d2dddf0b5ae9af9008770d73ea328ed5d2b2219a43
[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" "7e3a7234dd42936d3c1b88d2dddf0b5ae9af9008770d73ea328ed5d2b2219a43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7e3a7234dd42936d3c1b88d2dddf0b5ae9af9008770d73ea328ed5d2b2219a43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e3a7234dd42936d3c1b88d2dddf0b5ae9af9008770d73ea328ed5d2b2219a43", kill_on_drop: false }`
[INFO] [stdout] 7e3a7234dd42936d3c1b88d2dddf0b5ae9af9008770d73ea328ed5d2b2219a43
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta-2022-04-10" "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] 40abb1c32f3e9adcbc15cad2d43c9abaaabdc5d6633f7b83d889efa62321aae7
[INFO] running `Command { std: "docker" "start" "-a" "40abb1c32f3e9adcbc15cad2d43c9abaaabdc5d6633f7b83d889efa62321aae7", kill_on_drop: false }`
[INFO] [stderr]    Compiling graphs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[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 `graphs` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "40abb1c32f3e9adcbc15cad2d43c9abaaabdc5d6633f7b83d889efa62321aae7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40abb1c32f3e9adcbc15cad2d43c9abaaabdc5d6633f7b83d889efa62321aae7", kill_on_drop: false }`
[INFO] [stdout] 40abb1c32f3e9adcbc15cad2d43c9abaaabdc5d6633f7b83d889efa62321aae7