[INFO] fetching crate tokio-cache 0.2.0-alpha.1...
[INFO] testing tokio-cache-0.2.0-alpha.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate tokio-cache 0.2.0-alpha.1 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate tokio-cache 0.2.0-alpha.1 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 tokio-cache 0.2.0-alpha.1
[INFO] finished tweaking crates.io crate tokio-cache 0.2.0-alpha.1
[INFO] tweaked toml for crates.io crate tokio-cache 0.2.0-alpha.1 written to /workspace/builds/worker-0/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] [stderr]     Blocking waiting for file lock on package cache
[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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] b634eaff6b52f471cb345092710e6eaedda07a04adca355bce209b99cf7498ae
[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" "b634eaff6b52f471cb345092710e6eaedda07a04adca355bce209b99cf7498ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b634eaff6b52f471cb345092710e6eaedda07a04adca355bce209b99cf7498ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b634eaff6b52f471cb345092710e6eaedda07a04adca355bce209b99cf7498ae", kill_on_drop: false }`
[INFO] [stdout] b634eaff6b52f471cb345092710e6eaedda07a04adca355bce209b99cf7498ae
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] d030bab6a99daeaed9a98285a2b8cabeba0c20049c86e5da2dba0b6a1456b65a
[INFO] running `Command { std: "docker" "start" "-a" "d030bab6a99daeaed9a98285a2b8cabeba0c20049c86e5da2dba0b6a1456b65a", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling im v13.0.0
[INFO] [stderr]    Compiling sized-chunks v0.3.1
[INFO] [stderr]    Compiling tokio-sync v0.2.0-alpha.6
[INFO] [stderr]    Compiling tokio-cache v0.2.0-alpha.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.79s
[INFO] running `Command { std: "docker" "inspect" "d030bab6a99daeaed9a98285a2b8cabeba0c20049c86e5da2dba0b6a1456b65a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d030bab6a99daeaed9a98285a2b8cabeba0c20049c86e5da2dba0b6a1456b65a", kill_on_drop: false }`
[INFO] [stdout] d030bab6a99daeaed9a98285a2b8cabeba0c20049c86e5da2dba0b6a1456b65a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5a873a3e3d2db6e034026c72a33cadd1b3db5ab117152a0e444d64fd77965c3f
[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" "5a873a3e3d2db6e034026c72a33cadd1b3db5ab117152a0e444d64fd77965c3f", kill_on_drop: false }`
[INFO] [stderr]    Compiling tokio v0.2.25
[INFO] [stderr]    Compiling criterion v0.3.5
[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/criterion-0.3.5/src/lib.rs:20:40
[INFO] [stdout]    |
[INFO] [stdout] 20 | #![cfg_attr(feature = "real_blackbox", 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 `criterion` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "5a873a3e3d2db6e034026c72a33cadd1b3db5ab117152a0e444d64fd77965c3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a873a3e3d2db6e034026c72a33cadd1b3db5ab117152a0e444d64fd77965c3f", kill_on_drop: false }`
[INFO] [stdout] 5a873a3e3d2db6e034026c72a33cadd1b3db5ab117152a0e444d64fd77965c3f