[INFO] fetching crate rusty-matrix 0.1.2...
[INFO] testing rusty-matrix-0.1.2 against 1.55.0 for beta-1.56-1
[INFO] extracting crate rusty-matrix 0.1.2 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate rusty-matrix 0.1.2 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 rusty-matrix 0.1.2
[INFO] finished tweaking crates.io crate rusty-matrix 0.1.2
[INFO] tweaked toml for crates.io crate rusty-matrix 0.1.2 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate rusty-matrix 0.1.2 already has a lockfile, it will not be regenerated
[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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 32c29209b6a22981949df47ee47e381817625e9d3d0e9171f58175b75209df54
[INFO] running `Command { std: "docker" "start" "-a" "32c29209b6a22981949df47ee47e381817625e9d3d0e9171f58175b75209df54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "32c29209b6a22981949df47ee47e381817625e9d3d0e9171f58175b75209df54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "32c29209b6a22981949df47ee47e381817625e9d3d0e9171f58175b75209df54", kill_on_drop: false }`
[INFO] [stdout] 32c29209b6a22981949df47ee47e381817625e9d3d0e9171f58175b75209df54
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] [stdout] 01988303ba4da7852228fe5b1d6e083a5e39b2d94dbc4f8b73b4c32845bcd279
[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" "01988303ba4da7852228fe5b1d6e083a5e39b2d94dbc4f8b73b4c32845bcd279", kill_on_drop: false }`
[INFO] [stderr]    Compiling rusty-matrix v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     const_fn,
[INFO] [stdout]   |     ^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:7:1
[INFO] [stdout]    |
[INFO] [stdout] 7  | / #![feature(
[INFO] [stdout] 8  | |     const_evaluatable_checked,
[INFO] [stdout] 9  | |     const_fn,
[INFO] [stdout] 10 | |     const_fn_trait_bound,
[INFO] [stdout] ...  |
[INFO] [stdout] 13 | |     trait_alias
[INFO] [stdout] 14 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rusty-matrix` due to 3 previous errors
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "01988303ba4da7852228fe5b1d6e083a5e39b2d94dbc4f8b73b4c32845bcd279", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01988303ba4da7852228fe5b1d6e083a5e39b2d94dbc4f8b73b4c32845bcd279", kill_on_drop: false }`
[INFO] [stdout] 01988303ba4da7852228fe5b1d6e083a5e39b2d94dbc4f8b73b4c32845bcd279