[INFO] cloning repository https://github.com/niticon/rusty_musician
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/niticon/rusty_musician" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fniticon%2Frusty_musician", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fniticon%2Frusty_musician'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 76aec0cb4843493df05ef3dfdc2ea5dffbe19e61
[INFO] testing niticon/rusty_musician against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fniticon%2Frusty_musician" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/niticon/rusty_musician 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/niticon/rusty_musician
[INFO] finished tweaking git repo https://github.com/niticon/rusty_musician
[INFO] tweaked toml for git repo https://github.com/niticon/rusty_musician written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/niticon/rusty_musician 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] 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" "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] d57690188e4d08983278da9ee3db1bee7e3bb2d9de7e5fe199b60a5caca44ef5
[INFO] running `Command { std: "docker" "start" "-a" "d57690188e4d08983278da9ee3db1bee7e3bb2d9de7e5fe199b60a5caca44ef5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d57690188e4d08983278da9ee3db1bee7e3bb2d9de7e5fe199b60a5caca44ef5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d57690188e4d08983278da9ee3db1bee7e3bb2d9de7e5fe199b60a5caca44ef5", kill_on_drop: false }`
[INFO] [stdout] d57690188e4d08983278da9ee3db1bee7e3bb2d9de7e5fe199b60a5caca44ef5
[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" "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] f5acc54692182f36c06bc422a32568532ea8bcc6a925c04f8d85a8a9fd3655e5
[INFO] running `Command { std: "docker" "start" "-a" "f5acc54692182f36c06bc422a32568532ea8bcc6a925c04f8d85a8a9fd3655e5", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling syn v1.0.65
[INFO] [stderr]    Compiling libc v0.2.91
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]    Compiling pyo3 v0.11.1
[INFO] [stderr]    Compiling inventory v0.1.10
[INFO] [stderr]    Compiling unindent v0.1.7
[INFO] [stderr]    Compiling trybuild v1.0.41
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]    Compiling pyo3 v0.13.2
[INFO] [stderr]    Compiling rustversion v1.0.4
[INFO] [stderr]    Compiling glob v0.3.0
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]    Compiling paste v0.1.18
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling pyo3-macros-backend v0.13.2
[INFO] [stderr]    Compiling inline-python-macros v0.5.3
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/inline-python-macros-0.5.3/src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(proc_macro_span)]
[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 `inline-python-macros` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "f5acc54692182f36c06bc422a32568532ea8bcc6a925c04f8d85a8a9fd3655e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5acc54692182f36c06bc422a32568532ea8bcc6a925c04f8d85a8a9fd3655e5", kill_on_drop: false }`
[INFO] [stdout] f5acc54692182f36c06bc422a32568532ea8bcc6a925c04f8d85a8a9fd3655e5