[INFO] fetching crate smlr 0.1.3...
[INFO] testing smlr-0.1.3 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate smlr 0.1.3 into /workspace/builds/worker-23/source
[INFO] validating manifest of crates.io crate smlr 0.1.3 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate smlr 0.1.3
[INFO] finished tweaking crates.io crate smlr 0.1.3
[INFO] tweaked toml for crates.io crate smlr 0.1.3 written to /workspace/builds/worker-23/source/Cargo.toml
[INFO] crate crates.io crate smlr 0.1.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde v1.0.115
[INFO] [stderr]   Downloaded eddie v0.4.2
[INFO] [stderr]   Downloaded subtle v2.2.3
[INFO] [stderr]   Downloaded blake2 v0.9.0
[INFO] [stderr]   Downloaded libc v0.2.74
[INFO] [stderr]   Downloaded serde_derive v1.0.115
[INFO] [stderr]   Downloaded syn v1.0.38
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 07fe6cdffa24e4e5fd2dd37538d3be624d32c161d099f326c25b06c34991878a
[INFO] running `Command { std: "docker" "start" "-a" "07fe6cdffa24e4e5fd2dd37538d3be624d32c161d099f326c25b06c34991878a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07fe6cdffa24e4e5fd2dd37538d3be624d32c161d099f326c25b06c34991878a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07fe6cdffa24e4e5fd2dd37538d3be624d32c161d099f326c25b06c34991878a", kill_on_drop: false }`
[INFO] [stdout] 07fe6cdffa24e4e5fd2dd37538d3be624d32c161d099f326c25b06c34991878a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-23/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" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 57ce455975d06f301dbf3bfff1b0e4610e7f7d7da0e13f858194a87b2070e23f
[INFO] running `Command { std: "docker" "start" "-a" "57ce455975d06f301dbf3bfff1b0e4610e7f7d7da0e13f858194a87b2070e23f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling subtle v2.2.3
[INFO] [stderr]    Compiling serde_json v1.0.57
[INFO] [stderr]    Compiling opaque-debug v0.2.3
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]    Compiling eddie v0.4.2
[INFO] [stderr]    Compiling hex v0.4.2
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling clap v2.33.1
[INFO] [stderr]    Compiling crypto-mac v0.8.0
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling blake2 v0.9.0
[INFO] [stderr]    Compiling smlr v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![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 `smlr` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "57ce455975d06f301dbf3bfff1b0e4610e7f7d7da0e13f858194a87b2070e23f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57ce455975d06f301dbf3bfff1b0e4610e7f7d7da0e13f858194a87b2070e23f", kill_on_drop: false }`
[INFO] [stdout] 57ce455975d06f301dbf3bfff1b0e4610e7f7d7da0e13f858194a87b2070e23f