[INFO] fetching crate boltdb 0.0.1...
[INFO] testing boltdb-0.0.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate boltdb 0.0.1 into /workspace/builds/worker-88/source
[INFO] validating manifest of crates.io crate boltdb 0.0.1 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 boltdb 0.0.1
[INFO] finished tweaking crates.io crate boltdb 0.0.1
[INFO] tweaked toml for crates.io crate boltdb 0.0.1 written to /workspace/builds/worker-88/source/Cargo.toml
[INFO] crate crates.io crate boltdb 0.0.1 already has a lockfile, it will not be regenerated
[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-88/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/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] 19420a07ebcec0c501ff74083e7e558f3603db7888a1bcbb934f367d126e14ac
[INFO] running `Command { std: "docker" "start" "-a" "19420a07ebcec0c501ff74083e7e558f3603db7888a1bcbb934f367d126e14ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19420a07ebcec0c501ff74083e7e558f3603db7888a1bcbb934f367d126e14ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19420a07ebcec0c501ff74083e7e558f3603db7888a1bcbb934f367d126e14ac", kill_on_drop: false }`
[INFO] [stdout] 19420a07ebcec0c501ff74083e7e558f3603db7888a1bcbb934f367d126e14ac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/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] [stdout] 133bded0df93ffc1e82aabef0bfe63629f173b2f3c5a6f0e1ec66d67d5d6ce40
[INFO] running `Command { std: "docker" "start" "-a" "133bded0df93ffc1e82aabef0bfe63629f173b2f3c5a6f0e1ec66d67d5d6ce40", kill_on_drop: false }`
[INFO] [stderr]    Compiling boltdb v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.85s
[INFO] running `Command { std: "docker" "inspect" "133bded0df93ffc1e82aabef0bfe63629f173b2f3c5a6f0e1ec66d67d5d6ce40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "133bded0df93ffc1e82aabef0bfe63629f173b2f3c5a6f0e1ec66d67d5d6ce40", kill_on_drop: false }`
[INFO] [stdout] 133bded0df93ffc1e82aabef0bfe63629f173b2f3c5a6f0e1ec66d67d5d6ce40
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-88/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] [stdout] 853d4ef18966095eb7848a54cf06659e27f125782c1a0e521a47c3d8dcf4a8af
[INFO] running `Command { std: "docker" "start" "-a" "853d4ef18966095eb7848a54cf06659e27f125782c1a0e521a47c3d8dcf4a8af", kill_on_drop: false }`
[INFO] [stderr]    Compiling boltdb v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not compile `boltdb` due to 2 previous errors
[INFO] [stdout] error[E0601]: `main` function not found in crate `echo`
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider adding a `main` function to `examples/echo.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rust_write`
[INFO] [stdout]  --> examples/cross-lang/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn rust_write() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rust_read`
[INFO] [stdout]  --> examples/cross-lang/main.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn rust_read() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "853d4ef18966095eb7848a54cf06659e27f125782c1a0e521a47c3d8dcf4a8af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "853d4ef18966095eb7848a54cf06659e27f125782c1a0e521a47c3d8dcf4a8af", kill_on_drop: false }`
[INFO] [stdout] 853d4ef18966095eb7848a54cf06659e27f125782c1a0e521a47c3d8dcf4a8af