[INFO] cloning repository https://github.com/davmatjo/streamin-conv
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/davmatjo/streamin-conv" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdavmatjo%2Fstreamin-conv", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdavmatjo%2Fstreamin-conv'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2499f3e6d7b88e54532e05908b8f7f22badbd744
[INFO] testing davmatjo/streamin-conv against beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdavmatjo%2Fstreamin-conv" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/davmatjo/streamin-conv on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/davmatjo/streamin-conv
[INFO] finished tweaking git repo https://github.com/davmatjo/streamin-conv
[INFO] tweaked toml for git repo https://github.com/davmatjo/streamin-conv written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/davmatjo/streamin-conv already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_test v0.8.23
[INFO] [stderr]   Downloaded hashbag v0.1.3
[INFO] [stderr]   Downloaded serde-hjson v0.9.1
[INFO] [stderr]   Downloaded config v0.10.1
[INFO] [stderr]   Downloaded evmap v10.0.2
[INFO] [stderr]   Downloaded serde_yaml v0.8.13
[INFO] [stderr]   Downloaded derive_more v0.99.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "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] 85308541a71641266d318a931052e98a12cf90cda249ef8775303fa9cae1ef83
[INFO] running `Command { std: "docker" "start" "-a" "85308541a71641266d318a931052e98a12cf90cda249ef8775303fa9cae1ef83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "85308541a71641266d318a931052e98a12cf90cda249ef8775303fa9cae1ef83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85308541a71641266d318a931052e98a12cf90cda249ef8775303fa9cae1ef83", kill_on_drop: false }`
[INFO] [stdout] 85308541a71641266d318a931052e98a12cf90cda249ef8775303fa9cae1ef83
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd609273fc437bed861683e8b36c2c60b71c8a0cf32bf946150ba1ca7fa808f7
[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" "fd609273fc437bed861683e8b36c2c60b71c8a0cf32bf946150ba1ca7fa808f7", kill_on_drop: false }`
[INFO] [stderr]    Compiling once_cell v1.4.1
[INFO] [stderr]    Compiling instant v0.1.6
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling serde v0.8.23
[INFO] [stderr]    Compiling rayon-core v1.8.0
[INFO] [stderr]    Compiling lexical-core v0.7.4
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling arrayvec v0.5.1
[INFO] [stderr]    Compiling hashbag v0.1.3
[INFO] [stderr]    Compiling rust-ini v0.13.0
[INFO] [stderr]    Compiling memoffset v0.5.5
[INFO] [stderr]    Compiling tracing-core v0.1.16
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling rayon v1.4.0
[INFO] [stderr]    Compiling yaml-rust v0.4.4
[INFO] [stderr]    Compiling futures-task v0.3.5
[INFO] [stderr]    Compiling parking_lot_core v0.8.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling evmap v10.0.2
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling derive_more v0.99.10
[INFO] [stderr]    Compiling tokio v0.2.22
[INFO] [stderr]    Compiling serde v1.0.116
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling futures-util v0.3.5
[INFO] [stderr]    Compiling parking_lot v0.11.0
[INFO] [stderr]    Compiling tracing v0.1.19
[INFO] [stderr]    Compiling crossbeam-deque v0.7.3
[INFO] [stderr]    Compiling serde_test v0.8.23
[INFO] [stderr]    Compiling linked-hash-map v0.3.0
[INFO] [stderr]    Compiling serde-hjson v0.9.1
[INFO] [stderr]    Compiling tokio-util v0.3.1
[INFO] [stderr]    Compiling actix-threadpool v0.3.3
[INFO] [stderr]    Compiling actix-codec v0.3.0
[INFO] [stderr]    Compiling actix-service v1.0.6
[INFO] [stderr]    Compiling futures-executor v0.3.5
[INFO] [stderr]    Compiling h2 v0.2.6
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]    Compiling serde_urlencoded v0.6.1
[INFO] [stderr]    Compiling actix-router v0.2.4
[INFO] [stderr]    Compiling toml v0.5.6
[INFO] [stderr]    Compiling serde_yaml v0.8.13
[INFO] [stderr]    Compiling uuid v0.8.1
[INFO] [stderr]    Compiling actix-rt v1.1.1
[INFO] [stderr]    Compiling futures v0.3.5
[INFO] [stderr]    Compiling trust-dns-proto v0.19.5
[INFO] [stderr]    Compiling actix-utils v2.0.0
[INFO] [stderr]    Compiling config v0.10.1
[INFO] [stderr]    Compiling actix-server v1.0.4
[INFO] [stderr]    Compiling actix-tls v2.0.0
[INFO] [stderr]    Compiling actix-testing v1.0.1
[INFO] [stderr]    Compiling trust-dns-resolver v0.19.5
[INFO] [stderr]    Compiling actix-connect v2.0.0
[INFO] [stderr]    Compiling actix-http v2.0.0
[INFO] [stderr]    Compiling awc v2.0.0
[INFO] [stderr]    Compiling actix-web v3.0.2
[INFO] [stderr]    Compiling streamin-conv 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:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(bool_to_option)]
[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 `streamin-conv`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "fd609273fc437bed861683e8b36c2c60b71c8a0cf32bf946150ba1ca7fa808f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd609273fc437bed861683e8b36c2c60b71c8a0cf32bf946150ba1ca7fa808f7", kill_on_drop: false }`
[INFO] [stdout] fd609273fc437bed861683e8b36c2c60b71c8a0cf32bf946150ba1ca7fa808f7