[INFO] fetching crate fixed_len_str_example 0.2.5...
[INFO] testing fixed_len_str_example-0.2.5 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate fixed_len_str_example 0.2.5 into /workspace/builds/worker-53/source
[INFO] validating manifest of crates.io crate fixed_len_str_example 0.2.5 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 fixed_len_str_example 0.2.5
[INFO] finished tweaking crates.io crate fixed_len_str_example 0.2.5
[INFO] tweaked toml for crates.io crate fixed_len_str_example 0.2.5 written to /workspace/builds/worker-53/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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-2021-09-08" "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-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/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] ab6d103d96bebf00df99869ac1f19d299be4ebf46bbe31621b8b5358f38038c3
[INFO] running `Command { std: "docker" "start" "-a" "ab6d103d96bebf00df99869ac1f19d299be4ebf46bbe31621b8b5358f38038c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ab6d103d96bebf00df99869ac1f19d299be4ebf46bbe31621b8b5358f38038c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab6d103d96bebf00df99869ac1f19d299be4ebf46bbe31621b8b5358f38038c3", kill_on_drop: false }`
[INFO] [stdout] ab6d103d96bebf00df99869ac1f19d299be4ebf46bbe31621b8b5358f38038c3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-53/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] ce7928b1d65e49fc59b9b453521d3637a3bd498453a9251904e462b183423120
[INFO] running `Command { std: "docker" "start" "-a" "ce7928b1d65e49fc59b9b453521d3637a3bd498453a9251904e462b183423120", kill_on_drop: false }`
[INFO] [stderr]    Compiling fixed_len_str v0.3.3
[INFO] [stderr]    Compiling fixed_len_str_example v0.2.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(pattern)]
[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 `fixed_len_str_example` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "ce7928b1d65e49fc59b9b453521d3637a3bd498453a9251904e462b183423120", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce7928b1d65e49fc59b9b453521d3637a3bd498453a9251904e462b183423120", kill_on_drop: false }`
[INFO] [stdout] ce7928b1d65e49fc59b9b453521d3637a3bd498453a9251904e462b183423120