[INFO] fetching crate notedown_ast 0.16.2...
[INFO] testing notedown_ast-0.16.2 against 1.59.0 for beta-1.60-1
[INFO] extracting crate notedown_ast 0.16.2 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate notedown_ast 0.16.2 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate notedown_ast 0.16.2
[INFO] finished tweaking crates.io crate notedown_ast 0.16.2
[INFO] tweaked toml for crates.io crate notedown_ast 0.16.2 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--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" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "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] 517a90b01f65c2316101c1086d26b535a6fddcbd176b5883271c4beba872751b
[INFO] running `Command { std: "docker" "start" "-a" "517a90b01f65c2316101c1086d26b535a6fddcbd176b5883271c4beba872751b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "517a90b01f65c2316101c1086d26b535a6fddcbd176b5883271c4beba872751b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "517a90b01f65c2316101c1086d26b535a6fddcbd176b5883271c4beba872751b", kill_on_drop: false }`
[INFO] [stdout] 517a90b01f65c2316101c1086d26b535a6fddcbd176b5883271c4beba872751b
[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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "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] 53ded8989e6d50925aa3b7b5f934d3c7a4cd95f5a1272e4658fe9be3637e918c
[INFO] running `Command { std: "docker" "start" "-a" "53ded8989e6d50925aa3b7b5f934d3c7a4cd95f5a1272e4658fe9be3637e918c", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling rust_decimal v1.22.0
[INFO] [stderr]    Compiling unidecode v0.3.0
[INFO] [stderr]    Compiling ropey v1.3.2
[INFO] [stderr]    Compiling ariadne v0.1.3
[INFO] [stderr]    Compiling css-color-parser v0.1.2
[INFO] [stderr]    Compiling html-escape v0.2.9
[INFO] [stderr]    Compiling ahash v0.7.6
[INFO] [stderr]    Compiling textwrap v0.14.2
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling slugify v0.1.0
[INFO] [stderr]    Compiling yggdrasil-shared v0.2.1
[INFO] [stderr]    Compiling emojic v0.4.0
[INFO] [stderr]    Compiling indexmap v1.8.0
[INFO] [stderr]    Compiling text-utils v0.4.3
[INFO] [stderr]    Compiling notedown-error v1.1.7
[INFO] [stderr]    Compiling notedown_ast v0.16.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(box_syntax)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(map_first_last)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(arbitrary_enum_discriminant)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `notedown_ast` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "53ded8989e6d50925aa3b7b5f934d3c7a4cd95f5a1272e4658fe9be3637e918c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53ded8989e6d50925aa3b7b5f934d3c7a4cd95f5a1272e4658fe9be3637e918c", kill_on_drop: false }`
[INFO] [stdout] 53ded8989e6d50925aa3b7b5f934d3c7a4cd95f5a1272e4658fe9be3637e918c