[INFO] fetching crate tdn 0.2.0...
[INFO] testing tdn-0.2.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate tdn 0.2.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate tdn 0.2.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tdn 0.2.0
[INFO] finished tweaking crates.io crate tdn 0.2.0
[INFO] tweaked toml for crates.io crate tdn 0.2.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate crates.io crate tdn 0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e5ba954aa2657fdb977109a7e11c14874e6324c0d23603ea45e8d0ee6a5d870c
[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" "e5ba954aa2657fdb977109a7e11c14874e6324c0d23603ea45e8d0ee6a5d870c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e5ba954aa2657fdb977109a7e11c14874e6324c0d23603ea45e8d0ee6a5d870c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e5ba954aa2657fdb977109a7e11c14874e6324c0d23603ea45e8d0ee6a5d870c", kill_on_drop: false }`
[INFO] [stdout] e5ba954aa2657fdb977109a7e11c14874e6324c0d23603ea45e8d0ee6a5d870c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1419035ab22e4dd42b9ab86defa91b54f9ebab88ce347fd41acfa1b21fa149dc
[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" "1419035ab22e4dd42b9ab86defa91b54f9ebab88ce347fd41acfa1b21fa149dc", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.41
[INFO] [stderr]    Compiling event-listener v2.4.0
[INFO] [stderr]    Compiling serde_derive v1.0.116
[INFO] [stderr]    Compiling serde v1.0.116
[INFO] [stderr]    Compiling fastrand v1.3.5
[INFO] [stderr]    Compiling subtle v2.3.0
[INFO] [stderr]    Compiling instant v0.1.6
[INFO] [stderr]    Compiling postcard-cobs v0.1.5-pre
[INFO] [stderr]    Compiling bit-vec v0.6.2
[INFO] [stderr]    Compiling futures-task v0.3.5
[INFO] [stderr]    Compiling ed25519 v1.0.2
[INFO] [stderr]    Compiling signal-hook-registry v1.2.1
[INFO] [stderr]    Compiling dirs-sys v0.3.5
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling polling v1.0.2
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling block-cipher v0.8.0
[INFO] [stderr]    Compiling parking_lot_core v0.8.0
[INFO] [stderr]    Compiling async-channel v1.4.2
[INFO] [stderr]    Compiling async-mutex v1.3.0
[INFO] [stderr]    Compiling async-semaphore v1.1.0
[INFO] [stderr]    Compiling sha2 v0.9.1
[INFO] [stderr]    Compiling dirs v2.0.2
[INFO] [stderr]    Compiling signal-hook v0.1.16
[INFO] [stderr]    Compiling futures-lite v1.4.0
[INFO] [stderr]    Compiling aes-soft v0.5.0
[INFO] [stderr]    Compiling block-modes v0.6.1
[INFO] [stderr]    Compiling async-rwlock v1.1.0
[INFO] [stderr]    Compiling async-barrier v1.0.1
[INFO] [stderr]    Compiling tungstenite v0.10.1
[INFO] [stderr]    Compiling parking_lot v0.11.0
[INFO] [stderr]    Compiling async-lock v2.1.3
[INFO] [stderr]    Compiling sled v0.34.4
[INFO] [stderr]    Compiling async-io v1.1.1
[INFO] [stderr]    Compiling blocking v1.0.0
[INFO] [stderr]    Compiling async-executor v1.1.1
[INFO] [stderr]    Compiling async-fs v1.3.0
[INFO] [stderr]    Compiling async-process v1.0.0
[INFO] [stderr]    Compiling async-net v1.3.0
[INFO] [stderr]    Compiling smol v1.0.1
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling zeroize_derive v1.0.1
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling zeroize v1.1.1
[INFO] [stderr]    Compiling curve25519-dalek v3.0.0
[INFO] [stderr]    Compiling x25519-dalek v1.1.0
[INFO] [stderr]    Compiling pin-project v0.4.23
[INFO] [stderr]    Compiling futures-util v0.3.5
[INFO] [stderr]    Compiling futures-executor v0.3.5
[INFO] [stderr]    Compiling async-tungstenite v0.4.2
[INFO] [stderr]    Compiling futures v0.3.5
[INFO] [stderr]    Compiling bincode v1.3.1
[INFO] [stderr]    Compiling chamomile_types v0.2.0
[INFO] [stderr]    Compiling postcard v0.5.1
[INFO] [stderr]    Compiling toml v0.5.6
[INFO] [stderr]    Compiling ed25519-dalek v1.0.0
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]    Compiling rckad v0.0.6
[INFO] [stderr]    Compiling tdn_types v0.2.0
[INFO] [stderr]    Compiling chamomile v0.2.0
[INFO] [stderr]    Compiling tdn v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(associated_type_defaults)]
[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 `tdn`
[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" "1419035ab22e4dd42b9ab86defa91b54f9ebab88ce347fd41acfa1b21fa149dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1419035ab22e4dd42b9ab86defa91b54f9ebab88ce347fd41acfa1b21fa149dc", kill_on_drop: false }`
[INFO] [stdout] 1419035ab22e4dd42b9ab86defa91b54f9ebab88ce347fd41acfa1b21fa149dc