[INFO] cloning repository https://github.com/emkay/tiny-cache
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/emkay/tiny-cache" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Femkay%2Ftiny-cache", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Femkay%2Ftiny-cache'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f57697a52bdc090baffcc3238edb439a34f29564
[INFO] testing emkay/tiny-cache against beta-2021-08-01 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Femkay%2Ftiny-cache" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/emkay/tiny-cache 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 git repo https://github.com/emkay/tiny-cache
[INFO] finished tweaking git repo https://github.com/emkay/tiny-cache
[INFO] tweaked toml for git repo https://github.com/emkay/tiny-cache written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/emkay/tiny-cache already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded futures-stable-preview v0.2.3
[INFO] [stderr]   Downloaded futures-io-preview v0.2.2
[INFO] [stderr]   Downloaded futures-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-channel-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-sink-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-executor-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-timer v0.3.0
[INFO] [stderr]   Downloaded futures-util-preview v0.2.2
[INFO] [stderr]   Downloaded futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]   Downloaded futures-preview v0.2.2
[INFO] [stderr]   Downloaded futures-async-runtime-preview v0.2.3
[INFO] [stderr]   Downloaded futures-sink-preview v0.2.2
[INFO] [stderr]   Downloaded futures-core-preview v0.2.3
[INFO] [stderr]   Downloaded futures-channel-preview v0.2.2
[INFO] [stderr]   Downloaded futures-executor-preview v0.2.2
[INFO] [stderr]   Downloaded async-std v0.99.3
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a876e9b87991f88cdacd50852b05f2cc1ecdff7566ae76fd8d792c8a6912522e
[INFO] running `Command { std: "docker" "start" "-a" "a876e9b87991f88cdacd50852b05f2cc1ecdff7566ae76fd8d792c8a6912522e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a876e9b87991f88cdacd50852b05f2cc1ecdff7566ae76fd8d792c8a6912522e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a876e9b87991f88cdacd50852b05f2cc1ecdff7566ae76fd8d792c8a6912522e", kill_on_drop: false }`
[INFO] [stdout] a876e9b87991f88cdacd50852b05f2cc1ecdff7566ae76fd8d792c8a6912522e
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5eaedb0216c55f7ee45a119f1865909b96efc81fa3f85da1d4102549eb956c75
[INFO] running `Command { std: "docker" "start" "-a" "5eaedb0216c55f7ee45a119f1865909b96efc81fa3f85da1d4102549eb956c75", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling either v1.5.2
[INFO] [stderr]    Compiling cfg-if v0.1.9
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling futures-core-preview v0.2.3
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-channel-preview v0.2.2
[INFO] [stderr]    Compiling async-task v1.0.0
[INFO] [stderr]    Compiling crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-sink-preview v0.2.2
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling num_cpus v1.10.1
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling futures-io-preview v0.2.2
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling futures-util-preview v0.2.2
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-executor-preview v0.2.2
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-timer v0.3.0
[INFO] [stderr]    Compiling futures-stable-preview v0.2.3
[INFO] [stderr]    Compiling futures-async-runtime-preview v0.2.3
[INFO] [stderr]    Compiling futures-preview v0.2.2
[INFO] [stderr]    Compiling async-std v0.99.3
[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/async-std-0.99.3/src/lib.rs:30:1
[INFO] [stdout]    |
[INFO] [stdout] 30 | #![feature(async_await)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[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 `async-std` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "5eaedb0216c55f7ee45a119f1865909b96efc81fa3f85da1d4102549eb956c75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5eaedb0216c55f7ee45a119f1865909b96efc81fa3f85da1d4102549eb956c75", kill_on_drop: false }`
[INFO] [stdout] 5eaedb0216c55f7ee45a119f1865909b96efc81fa3f85da1d4102549eb956c75
