[INFO] fetching crate tokio-cache 0.2.0-alpha.1...
[INFO] testing tokio-cache-0.2.0-alpha.1 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate tokio-cache 0.2.0-alpha.1 into /workspace/builds/worker-41/source
[INFO] validating manifest of crates.io crate tokio-cache 0.2.0-alpha.1 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-41/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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" "+beta-2021-08-01" "fetch" "--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-41/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-41/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 449c01dc9b4820d9aede41dd9461813197a963c5dcf7a27acae0f040d735ce0d
[INFO] running `Command { std: "docker" "start" "-a" "449c01dc9b4820d9aede41dd9461813197a963c5dcf7a27acae0f040d735ce0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "449c01dc9b4820d9aede41dd9461813197a963c5dcf7a27acae0f040d735ce0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "449c01dc9b4820d9aede41dd9461813197a963c5dcf7a27acae0f040d735ce0d", kill_on_drop: false }`
[INFO] [stdout] 449c01dc9b4820d9aede41dd9461813197a963c5dcf7a27acae0f040d735ce0d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-41/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-41/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] be03052d5ea7a0416bbaab2b94fe652c7f57c892279ebdd430815376613b0531
[INFO] running `Command { std: "docker" "start" "-a" "be03052d5ea7a0416bbaab2b94fe652c7f57c892279ebdd430815376613b0531", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling arc-swap v0.4.8
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling im v13.0.0
[INFO] [stderr]    Compiling tokio-sync v0.2.0-alpha.6
[INFO] [stderr]    Compiling sized-chunks v0.3.1
[INFO] [stderr]    Compiling tokio-cache v0.2.0-alpha.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.41s
[INFO] running `Command { std: "docker" "inspect" "be03052d5ea7a0416bbaab2b94fe652c7f57c892279ebdd430815376613b0531", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be03052d5ea7a0416bbaab2b94fe652c7f57c892279ebdd430815376613b0531", kill_on_drop: false }`
[INFO] [stdout] be03052d5ea7a0416bbaab2b94fe652c7f57c892279ebdd430815376613b0531
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-41/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-41/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dc80b61010ad1af779640699e5ad4290acf6c56c1f3e37d9487dcc25e4ccb8f0
[INFO] running `Command { std: "docker" "start" "-a" "dc80b61010ad1af779640699e5ad4290acf6c56c1f3e37d9487dcc25e4ccb8f0", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling regex-automata v0.1.10
[INFO] [stderr]    Compiling plotters-backend v0.3.2
[INFO] [stderr]    Compiling half v1.7.1
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling same-file v1.0.6
[INFO] [stderr]    Compiling oorandom v11.1.3
[INFO] [stderr]    Compiling bytes v0.5.6
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling itertools v0.10.1
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling walkdir v2.3.2
[INFO] [stderr]    Compiling plotters-svg v0.3.1
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling tokio v0.2.25
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling plotters v0.3.1
[INFO] [stderr]    Compiling criterion-plot v0.4.4
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]    Compiling serde_cbor v0.11.1
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling criterion v0.3.5
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta 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" "dc80b61010ad1af779640699e5ad4290acf6c56c1f3e37d9487dcc25e4ccb8f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc80b61010ad1af779640699e5ad4290acf6c56c1f3e37d9487dcc25e4ccb8f0", kill_on_drop: false }`
[INFO] [stdout] dc80b61010ad1af779640699e5ad4290acf6c56c1f3e37d9487dcc25e4ccb8f0
