[INFO] fetching crate packed-vec 0.0.1-alpha.12...
[INFO] testing packed-vec-0.0.1-alpha.12 against 1.60.0 for beta-1.61-1
[INFO] extracting crate packed-vec 0.0.1-alpha.12 into /workspace/builds/worker-24/source
[INFO] validating manifest of crates.io crate packed-vec 0.0.1-alpha.12 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate packed-vec 0.0.1-alpha.12
[INFO] finished tweaking crates.io crate packed-vec 0.0.1-alpha.12
[INFO] tweaked toml for crates.io crate packed-vec 0.0.1-alpha.12 written to /workspace/builds/worker-24/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand_core v0.6.3
[INFO] [stderr]   Downloaded rand v0.8.5
[INFO] [stderr]   Downloaded getrandom v0.2.6
[INFO] [stderr]   Downloaded rand_chacha v0.3.1
[INFO] [stderr]   Downloaded wasi v0.10.2+wasi-snapshot-preview1
[INFO] [stderr]   Downloaded libc v0.2.123
[INFO] [stderr]   Downloaded prefix-varint v0.0.1-alpha.6
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.16
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c3ddefdad18762b971d1133f55373c44caba52a64a44326a600265edf3265d80
[INFO] running `Command { std: "docker" "start" "-a" "c3ddefdad18762b971d1133f55373c44caba52a64a44326a600265edf3265d80", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c3ddefdad18762b971d1133f55373c44caba52a64a44326a600265edf3265d80", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3ddefdad18762b971d1133f55373c44caba52a64a44326a600265edf3265d80", kill_on_drop: false }`
[INFO] [stdout] c3ddefdad18762b971d1133f55373c44caba52a64a44326a600265edf3265d80
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1bdaaaad498475b2eceaf871aa3e1f529910387607cbe49bb04dd22a403267ad
[INFO] running `Command { std: "docker" "start" "-a" "1bdaaaad498475b2eceaf871aa3e1f529910387607cbe49bb04dd22a403267ad", kill_on_drop: false }`
[INFO] [stderr]    Compiling prefix-varint v0.0.1-alpha.6
[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/prefix-varint-0.0.1-alpha.6/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(cursor_remaining)]
[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 `prefix-varint` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "1bdaaaad498475b2eceaf871aa3e1f529910387607cbe49bb04dd22a403267ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bdaaaad498475b2eceaf871aa3e1f529910387607cbe49bb04dd22a403267ad", kill_on_drop: false }`
[INFO] [stdout] 1bdaaaad498475b2eceaf871aa3e1f529910387607cbe49bb04dd22a403267ad