[INFO] fetching crate yts 0.1.0...
[INFO] testing yts-0.1.0 against 1.54.0 for beta-1.55-1
[INFO] extracting crate yts 0.1.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate yts 0.1.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate yts 0.1.0
[INFO] finished tweaking crates.io crate yts 0.1.0
[INFO] tweaked toml for crates.io crate yts 0.1.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate yts 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded select v0.6.0-alpha.1
[INFO] [stderr]   Downloaded cached-path v0.5.1
[INFO] [stderr]   Downloaded zip-extensions v0.6.0
[INFO] [stderr]   Downloaded hyphenation_commons v0.8.0
[INFO] [stderr]   Downloaded fst v0.4.6
[INFO] [stderr]   Downloaded hyphenation v0.8.0
[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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 06f4b3493a3d6dcd70f3233258d3244b0e3aeb3b9f78b7e435f77ffd180205d2
[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" "06f4b3493a3d6dcd70f3233258d3244b0e3aeb3b9f78b7e435f77ffd180205d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "06f4b3493a3d6dcd70f3233258d3244b0e3aeb3b9f78b7e435f77ffd180205d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "06f4b3493a3d6dcd70f3233258d3244b0e3aeb3b9f78b7e435f77ffd180205d2", kill_on_drop: false }`
[INFO] [stdout] 06f4b3493a3d6dcd70f3233258d3244b0e3aeb3b9f78b7e435f77ffd180205d2
[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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b5be67af1c8ca144c6fa825838bdf3cb36cb763c8351b8f95b9404abc4f5fdee
[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" "b5be67af1c8ca144c6fa825838bdf3cb36cb763c8351b8f95b9404abc4f5fdee", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling fst v0.4.6
[INFO] [stderr]    Compiling openssl v0.10.34
[INFO] [stderr]    Compiling pocket-resources v0.3.2
[INFO] [stderr]    Compiling smawk v0.3.1
[INFO] [stderr]    Compiling encode_unicode v0.3.6
[INFO] [stderr]    Compiling openssl-sys v0.9.63
[INFO] [stderr]    Compiling tokio v1.6.1
[INFO] [stderr]    Compiling futures-util v0.3.15
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]    Compiling bzip2-sys v0.1.10+1.0.8
[INFO] [stderr]    Compiling tracing v0.1.26
[INFO] [stderr]    Compiling tendril v0.4.2
[INFO] [stderr]    Compiling http-body v0.4.2
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling terminal_size v0.1.17
[INFO] [stderr]    Compiling term_size v0.3.2
[INFO] [stderr]    Compiling filetime v0.2.14
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling xattr v0.2.2
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling colored v2.0.0
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling flate2 v1.0.20
[INFO] [stderr]    Compiling rand_core v0.6.2
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling tar v0.4.35
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling rand_chacha v0.3.0
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling bzip2 v0.3.3
[INFO] [stderr]    Compiling native-tls v0.2.7
[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stderr]    Compiling console v0.14.1
[INFO] [stderr]    Compiling env_logger v0.8.3
[INFO] [stderr]    Compiling tempfile v3.2.0
[INFO] [stderr]    Compiling indicatif v0.15.0
[INFO] [stderr]    Compiling phf_generator v0.8.0
[INFO] [stderr]    Compiling string_cache_codegen v0.5.1
[INFO] [stderr]    Compiling phf_codegen v0.8.0
[INFO] [stderr]    Compiling markup5ever v0.10.1
[INFO] [stderr]    Compiling tokio-util v0.6.7
[INFO] [stderr]    Compiling tokio-native-tls v0.3.0
[INFO] [stderr]    Compiling h2 v0.3.3
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling pin-project-internal v1.0.7
[INFO] [stderr]    Compiling html5ever v0.25.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.25
[INFO] [stderr]    Compiling strum_macros v0.20.1
[INFO] [stderr]    Compiling thiserror v1.0.25
[INFO] [stderr]    Compiling pin-project v1.0.7
[INFO] [stderr]    Compiling zip v0.5.12
[INFO] [stderr]    Compiling hyper v0.14.8
[INFO] [stderr]    Compiling strum v0.20.0
[INFO] [stderr]    Compiling zip-extensions v0.6.0
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling hyper-tls v0.5.0
[INFO] [stderr]    Compiling string_cache v0.8.1
[INFO] [stderr]    Compiling bincode v1.3.3
[INFO] [stderr]    Compiling hyphenation_commons v0.8.0
[INFO] [stderr]    Compiling url v2.2.2
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling serde_urlencoded v0.7.0
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling hyphenation v0.8.0
[INFO] [stderr]    Compiling prettytable-rs v0.8.0
[INFO] [stderr]    Compiling reqwest v0.11.3
[INFO] [stderr]    Compiling xml5ever v0.16.1
[INFO] [stderr]    Compiling textwrap v0.13.4
[INFO] [stderr]    Compiling markup5ever_rcdom v0.1.0
[INFO] [stderr]    Compiling select v0.6.0-alpha.1
[INFO] [stderr]    Compiling cached-path v0.5.1
[INFO] [stderr]    Compiling yts v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![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 `yts`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "b5be67af1c8ca144c6fa825838bdf3cb36cb763c8351b8f95b9404abc4f5fdee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5be67af1c8ca144c6fa825838bdf3cb36cb763c8351b8f95b9404abc4f5fdee", kill_on_drop: false }`
[INFO] [stdout] b5be67af1c8ca144c6fa825838bdf3cb36cb763c8351b8f95b9404abc4f5fdee
