[INFO] fetching crate saloc-lib 0.0.0...
[INFO] testing saloc-lib-0.0.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate saloc-lib 0.0.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate saloc-lib 0.0.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate saloc-lib 0.0.0
[INFO] finished tweaking crates.io crate saloc-lib 0.0.0
[INFO] tweaked toml for crates.io crate saloc-lib 0.0.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2dd7fa7c4dbc60337916e24ea83e0d85ebc8c2859606e068c04f35c2bf4f39a0
[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" "2dd7fa7c4dbc60337916e24ea83e0d85ebc8c2859606e068c04f35c2bf4f39a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2dd7fa7c4dbc60337916e24ea83e0d85ebc8c2859606e068c04f35c2bf4f39a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2dd7fa7c4dbc60337916e24ea83e0d85ebc8c2859606e068c04f35c2bf4f39a0", kill_on_drop: false }`
[INFO] [stdout] 2dd7fa7c4dbc60337916e24ea83e0d85ebc8c2859606e068c04f35c2bf4f39a0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ee73756d9f49e775b0d0a3a62a3e1033a6084d44bf41b27f925d4eb89696f0d0
[INFO] running `Command { std: "docker" "start" "-a" "ee73756d9f49e775b0d0a3a62a3e1033a6084d44bf41b27f925d4eb89696f0d0", kill_on_drop: false }`
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling pico-args v0.4.2
[INFO] [stderr]    Compiling yansi v0.5.0
[INFO] [stderr]    Compiling itertools v0.10.1
[INFO] [stderr]    Compiling string_cache v0.8.1
[INFO] [stderr]    Compiling ena v0.14.0
[INFO] [stderr]    Compiling lalrpop-util v0.19.6
[INFO] [stderr]    Compiling ascii-canvas v3.0.0
[INFO] [stderr]    Compiling tracing-subscriber v0.2.20
[INFO] [stderr]    Compiling aquamarine v0.1.10
[INFO] [stderr]    Compiling clap_derive v3.0.0-beta.4
[INFO] [stderr]    Compiling typestate-proc-macro v0.8.0
[INFO] [stderr]    Compiling bit-set v0.5.2
[INFO] [stderr]    Compiling ariadne v0.1.3
[INFO] [stderr]    Compiling lalrpop v0.19.6
[INFO] [stderr]    Compiling tracing-error v0.1.2
[INFO] [stderr]    Compiling color-spantrace v0.1.6
[INFO] [stderr]    Compiling color-eyre v0.5.11
[INFO] [stderr]    Compiling clap v3.0.0-beta.4
[INFO] [stderr]    Compiling typestate v0.8.0
[INFO] [stderr]    Compiling saloc-lib v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(format_args_capture, crate_visibility_modifier, 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 `saloc-lib` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "ee73756d9f49e775b0d0a3a62a3e1033a6084d44bf41b27f925d4eb89696f0d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee73756d9f49e775b0d0a3a62a3e1033a6084d44bf41b27f925d4eb89696f0d0", kill_on_drop: false }`
[INFO] [stdout] ee73756d9f49e775b0d0a3a62a3e1033a6084d44bf41b27f925d4eb89696f0d0