[INFO] cloning repository https://github.com/gregtatum/rust-sketches
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gregtatum/rust-sketches" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgregtatum%2Frust-sketches", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgregtatum%2Frust-sketches'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5123281d015c8e075abf6f4ed1efe41a099a939a
[INFO] testing gregtatum/rust-sketches against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgregtatum%2Frust-sketches" "/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/gregtatum/rust-sketches on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gregtatum/rust-sketches
[INFO] finished tweaking git repo https://github.com/gregtatum/rust-sketches
[INFO] tweaked toml for git repo https://github.com/gregtatum/rust-sketches written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/gregtatum/rust-sketches already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2b733288361897bcaa96d7f1e10c000e0b9a84976b3d16fca6f06ea0b8892b20
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "2b733288361897bcaa96d7f1e10c000e0b9a84976b3d16fca6f06ea0b8892b20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2b733288361897bcaa96d7f1e10c000e0b9a84976b3d16fca6f06ea0b8892b20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b733288361897bcaa96d7f1e10c000e0b9a84976b3d16fca6f06ea0b8892b20", kill_on_drop: false }`
[INFO] [stdout] 2b733288361897bcaa96d7f1e10c000e0b9a84976b3d16fca6f06ea0b8892b20
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 107087058fc6cdd7814bac34682a905780bfe57902de7fb6cad52e17b96be05a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "107087058fc6cdd7814bac34682a905780bfe57902de7fb6cad52e17b96be05a", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]    Compiling tinystr-raw v0.1.0
[INFO] [stderr]    Compiling icu_uniset v0.1.0
[INFO] [stderr]    Compiling fixed_decimal v0.1.0
[INFO] [stderr]    Compiling tinystr-macros v0.2.0
[INFO] [stderr]    Compiling tinystr v0.4.1
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling icu_locid v0.1.0
[INFO] [stderr]    Compiling smallstr v0.2.0
[INFO] [stderr]    Compiling erased-serde v0.3.12
[INFO] [stderr]    Compiling toml v0.5.7
[INFO] [stderr]    Compiling serde_json v1.0.60
[INFO] [stderr]    Compiling icu_provider v0.1.0
[INFO] [stderr]    Compiling proc-macro-crate v0.1.5
[INFO] [stderr]    Compiling icu_datetime v0.1.0
[INFO] [stderr]    Compiling icu_plurals v0.1.0
[INFO] [stderr]    Compiling icu_provider_fs v0.1.0
[INFO] [stderr]    Compiling icu_locid_macros v0.1.0
[INFO] [stderr]    Compiling icu v0.1.0
[INFO] [stderr]    Compiling spec-rs v0.1.0 (/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(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 `spec-rs`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "107087058fc6cdd7814bac34682a905780bfe57902de7fb6cad52e17b96be05a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "107087058fc6cdd7814bac34682a905780bfe57902de7fb6cad52e17b96be05a", kill_on_drop: false }`
[INFO] [stdout] 107087058fc6cdd7814bac34682a905780bfe57902de7fb6cad52e17b96be05a