[INFO] fetching crate exact-conv 0.2.1...
[INFO] testing exact-conv-0.2.1 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate exact-conv 0.2.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate exact-conv 0.2.1 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 exact-conv 0.2.1
[INFO] finished tweaking crates.io crate exact-conv 0.2.1
[INFO] tweaked toml for crates.io crate exact-conv 0.2.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate exact-conv 0.2.1 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] bec3f6b5e6da3e2e2bb708aa4c96f6020e223bcd6498dcb5d52b85ae20751884
[INFO] running `Command { std: "docker" "start" "-a" "bec3f6b5e6da3e2e2bb708aa4c96f6020e223bcd6498dcb5d52b85ae20751884", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bec3f6b5e6da3e2e2bb708aa4c96f6020e223bcd6498dcb5d52b85ae20751884", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bec3f6b5e6da3e2e2bb708aa4c96f6020e223bcd6498dcb5d52b85ae20751884", kill_on_drop: false }`
[INFO] [stdout] bec3f6b5e6da3e2e2bb708aa4c96f6020e223bcd6498dcb5d52b85ae20751884
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] ccf125e7252c1e41f2f5cc7636f7174b6be0ac59c653f4d439ce516e75195657
[INFO] running `Command { std: "docker" "start" "-a" "ccf125e7252c1e41f2f5cc7636f7174b6be0ac59c653f4d439ce516e75195657", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling exact-conv v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.12s
[INFO] running `Command { std: "docker" "inspect" "ccf125e7252c1e41f2f5cc7636f7174b6be0ac59c653f4d439ce516e75195657", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ccf125e7252c1e41f2f5cc7636f7174b6be0ac59c653f4d439ce516e75195657", kill_on_drop: false }`
[INFO] [stdout] ccf125e7252c1e41f2f5cc7636f7174b6be0ac59c653f4d439ce516e75195657
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 990d7e5a24327a580c71c3c31039637b84d93e2da398387260cc16c8679ce671
[INFO] running `Command { std: "docker" "start" "-a" "990d7e5a24327a580c71c3c31039637b84d93e2da398387260cc16c8679ce671", kill_on_drop: false }`
[INFO] [stderr]    Compiling exact-conv v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> examples/ieee754.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(int_bits_const)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exact-conv` due to 2 previous errors
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "990d7e5a24327a580c71c3c31039637b84d93e2da398387260cc16c8679ce671", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "990d7e5a24327a580c71c3c31039637b84d93e2da398387260cc16c8679ce671", kill_on_drop: false }`
[INFO] [stdout] 990d7e5a24327a580c71c3c31039637b84d93e2da398387260cc16c8679ce671
