[INFO] fetching crate coffer 1.0.1...
[INFO] testing coffer-1.0.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate coffer 1.0.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate coffer 1.0.1 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate coffer 1.0.1
[INFO] finished tweaking crates.io crate coffer 1.0.1
[INFO] tweaked toml for crates.io crate coffer 1.0.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 882c88b4180e58dd9e80f5ad1ef89ca7d834c6c6a450053532100af0b45398f8
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "882c88b4180e58dd9e80f5ad1ef89ca7d834c6c6a450053532100af0b45398f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "882c88b4180e58dd9e80f5ad1ef89ca7d834c6c6a450053532100af0b45398f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "882c88b4180e58dd9e80f5ad1ef89ca7d834c6c6a450053532100af0b45398f8", kill_on_drop: false }`
[INFO] [stdout] 882c88b4180e58dd9e80f5ad1ef89ca7d834c6c6a450053532100af0b45398f8
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 61090d8ffd9a9507e6cc045cc8f5db93c84deec2ec408b8cefe53a60d36682b5
[INFO] running `Command { std: "docker" "start" "-a" "61090d8ffd9a9507e6cc045cc8f5db93c84deec2ec408b8cefe53a60d36682b5", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling nom v6.2.1
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]    Compiling thiserror-impl v1.0.29
[INFO] [stderr]    Compiling coffer-macros v1.0.0
[INFO] [stderr]    Compiling thiserror v1.0.29
[INFO] [stderr]    Compiling coffer v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.22s
[INFO] running `Command { std: "docker" "inspect" "61090d8ffd9a9507e6cc045cc8f5db93c84deec2ec408b8cefe53a60d36682b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61090d8ffd9a9507e6cc045cc8f5db93c84deec2ec408b8cefe53a60d36682b5", kill_on_drop: false }`
[INFO] [stdout] 61090d8ffd9a9507e6cc045cc8f5db93c84deec2ec408b8cefe53a60d36682b5
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c2a1a89ed848321018ff7f08bbde3e1a37c81e840a61d9bafd47291b01eab054
[INFO] running `Command { std: "docker" "start" "-a" "c2a1a89ed848321018ff7f08bbde3e1a37c81e840a61d9bafd47291b01eab054", kill_on_drop: false }`
[INFO] [stderr]    Compiling coffer v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `class_sample`
[INFO] [stdout]   --> src/tests/mod.rs:66:53
[INFO] [stdout]    |
[INFO] [stdout] 66 |         static ref SAMPLE: Vec<(String, Vec<u8>)> = class_sample::get_sample_name_bytes(2 * 1024);
[INFO] [stdout]    |                                                     ^^^^^^^^^^^^ use of undeclared crate or module `class_sample`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:30:47
[INFO] [stdout]    |
[INFO] [stdout] 30 | #![cfg_attr(any(feature = "backtrace", test), feature(backtrace))]
[INFO] [stdout]    |                                               ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0433, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `coffer` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "c2a1a89ed848321018ff7f08bbde3e1a37c81e840a61d9bafd47291b01eab054", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2a1a89ed848321018ff7f08bbde3e1a37c81e840a61d9bafd47291b01eab054", kill_on_drop: false }`
[INFO] [stdout] c2a1a89ed848321018ff7f08bbde3e1a37c81e840a61d9bafd47291b01eab054