[INFO] fetching crate syllabize-es 0.5.1...
[INFO] testing syllabize-es-0.5.1 against 1.59.0 for beta-1.60-1
[INFO] extracting crate syllabize-es 0.5.1 into /workspace/builds/worker-18/source
[INFO] validating manifest of crates.io crate syllabize-es 0.5.1 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 syllabize-es 0.5.1
[INFO] finished tweaking crates.io crate syllabize-es 0.5.1
[INFO] tweaked toml for crates.io crate syllabize-es 0.5.1 written to /workspace/builds/worker-18/source/Cargo.toml
[INFO] crate crates.io crate syllabize-es 0.5.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `edition2021` has been stabilized in the 1.56 release and is no longer necessary to be listed in the manifest
[INFO] [stderr]   See https://doc.rust-lang.org/cargo/reference/manifest.html#the-edition-field for more information about using this feature.
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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] [stdout] 5b7e6619ce6ce6953da5a6a19b28ac460494a7652a05545caf7dbaddf42029b7
[INFO] running `Command { std: "docker" "start" "-a" "5b7e6619ce6ce6953da5a6a19b28ac460494a7652a05545caf7dbaddf42029b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b7e6619ce6ce6953da5a6a19b28ac460494a7652a05545caf7dbaddf42029b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b7e6619ce6ce6953da5a6a19b28ac460494a7652a05545caf7dbaddf42029b7", kill_on_drop: false }`
[INFO] [stdout] 5b7e6619ce6ce6953da5a6a19b28ac460494a7652a05545caf7dbaddf42029b7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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] [stdout] 6fc62e9e1f99e139aa1e845b5b1fd82546d2fce3ff0f7be60793ca227fb27829
[INFO] running `Command { std: "docker" "start" "-a" "6fc62e9e1f99e139aa1e845b5b1fd82546d2fce3ff0f7be60793ca227fb27829", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `edition2021` has been stabilized in the 1.56 release and is no longer necessary to be listed in the manifest
[INFO] [stderr]   See https://doc.rust-lang.org/cargo/reference/manifest.html#the-edition-field for more information about using this feature.
[INFO] [stderr]    Compiling syllabize-es v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(test)]
[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 `syllabize-es` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "6fc62e9e1f99e139aa1e845b5b1fd82546d2fce3ff0f7be60793ca227fb27829", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fc62e9e1f99e139aa1e845b5b1fd82546d2fce3ff0f7be60793ca227fb27829", kill_on_drop: false }`
[INFO] [stdout] 6fc62e9e1f99e139aa1e845b5b1fd82546d2fce3ff0f7be60793ca227fb27829