[INFO] cloning repository https://github.com/KnuckleheadsClub/rbdt
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KnuckleheadsClub/rbdt" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKnuckleheadsClub%2Frbdt", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKnuckleheadsClub%2Frbdt'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 19efea9fda17b91e481b1743bf686865c09573f4
[INFO] testing KnuckleheadsClub/rbdt against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKnuckleheadsClub%2Frbdt" "/workspace/builds/worker-21/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-21/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/KnuckleheadsClub/rbdt 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 git repo https://github.com/KnuckleheadsClub/rbdt
[INFO] finished tweaking git repo https://github.com/KnuckleheadsClub/rbdt
[INFO] tweaked toml for git repo https://github.com/KnuckleheadsClub/rbdt written to /workspace/builds/worker-21/source/Cargo.toml
[INFO] crate git repo https://github.com/KnuckleheadsClub/rbdt 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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] 99d8df2a1e3d08a2baea91a50efe2524149c6ce417fc6ed72368e97964113cd9
[INFO] running `Command { std: "docker" "start" "-a" "99d8df2a1e3d08a2baea91a50efe2524149c6ce417fc6ed72368e97964113cd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "99d8df2a1e3d08a2baea91a50efe2524149c6ce417fc6ed72368e97964113cd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99d8df2a1e3d08a2baea91a50efe2524149c6ce417fc6ed72368e97964113cd9", kill_on_drop: false }`
[INFO] [stdout] 99d8df2a1e3d08a2baea91a50efe2524149c6ce417fc6ed72368e97964113cd9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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] 8b5152a93eb637bab5b542ce8abc8c004e5afef1c4599fd938937beaa44449eb
[INFO] running `Command { std: "docker" "start" "-a" "8b5152a93eb637bab5b542ce8abc8c004e5afef1c4599fd938937beaa44449eb", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling syn v1.0.81
[INFO] [stderr]    Compiling pyo3-build-config v0.14.5
[INFO] [stderr]    Compiling libc v0.2.106
[INFO] [stderr]    Compiling unindent v0.1.7
[INFO] [stderr]    Compiling deunicode v1.3.1
[INFO] [stderr]    Compiling unicode-bom v1.1.4
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]    Compiling paste v0.1.18
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]    Compiling parking_lot v0.11.2
[INFO] [stderr]    Compiling pyo3 v0.14.5
[INFO] [stderr]    Compiling pyo3-macros-backend v0.14.5
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling indoc-impl v0.3.6
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling pyo3-macros v0.14.5
[INFO] [stderr]    Compiling indoc v0.3.6
[INFO] [stderr]    Compiling rbdt v0.0.4-alpha2 (/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(proc_macro_hygiene, decl_macro)]
[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 `rbdt` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "8b5152a93eb637bab5b542ce8abc8c004e5afef1c4599fd938937beaa44449eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b5152a93eb637bab5b542ce8abc8c004e5afef1c4599fd938937beaa44449eb", kill_on_drop: false }`
[INFO] [stdout] 8b5152a93eb637bab5b542ce8abc8c004e5afef1c4599fd938937beaa44449eb