[INFO] fetching crate timmy 0.3.0...
[INFO] testing timmy-0.3.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate timmy 0.3.0 into /workspace/builds/worker-55/source
[INFO] validating manifest of crates.io crate timmy 0.3.0 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 timmy 0.3.0
[INFO] finished tweaking crates.io crate timmy 0.3.0
[INFO] tweaked toml for crates.io crate timmy 0.3.0 written to /workspace/builds/worker-55/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] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded regex v0.1.80
[INFO] [stderr]   Downloaded env_logger v0.3.5
[INFO] [stderr]   Downloaded thread-id v2.0.0
[INFO] [stderr]   Downloaded thread_local v0.2.7
[INFO] [stderr]   Downloaded lru-cache v0.0.7
[INFO] [stderr]   Downloaded aho-corasick v0.5.3
[INFO] [stderr]   Downloaded memchr v0.1.11
[INFO] [stderr]   Downloaded ansi_term v0.8.0
[INFO] [stderr]   Downloaded utf8-ranges v0.1.3
[INFO] [stderr]   Downloaded linked-hash-map v0.0.9
[INFO] [stderr]   Downloaded regex-syntax v0.3.9
[INFO] [stderr]   Downloaded libsqlite3-sys v0.5.0
[INFO] [stderr]   Downloaded rusqlite v0.7.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/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] 626e70f6cb838b6409966d32398df37ff06632bbed1aa9b4b85bfcaa4f17855e
[INFO] running `Command { std: "docker" "start" "-a" "626e70f6cb838b6409966d32398df37ff06632bbed1aa9b4b85bfcaa4f17855e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "626e70f6cb838b6409966d32398df37ff06632bbed1aa9b4b85bfcaa4f17855e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "626e70f6cb838b6409966d32398df37ff06632bbed1aa9b4b85bfcaa4f17855e", kill_on_drop: false }`
[INFO] [stdout] 626e70f6cb838b6409966d32398df37ff06632bbed1aa9b4b85bfcaa4f17855e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-55/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] 1e2e5b2d7f47e7d90d63cf6b71bddc82d3ea4225c2b367677d46dff5ce1355a1
[INFO] running `Command { std: "docker" "start" "-a" "1e2e5b2d7f47e7d90d63cf6b71bddc82d3ea4225c2b367677d46dff5ce1355a1", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling winapi v0.2.8
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling linked-hash-map v0.0.9
[INFO] [stderr]    Compiling regex-syntax v0.3.9
[INFO] [stderr]    Compiling utf8-ranges v0.1.3
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling bitflags v0.7.0
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling ansi_term v0.8.0
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling memchr v0.1.11
[INFO] [stderr]    Compiling aho-corasick v0.5.3
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling lru-cache v0.0.7
[INFO] [stderr]    Compiling libsqlite3-sys v0.5.0
[INFO] [stderr]    Compiling thread-id v2.0.0
[INFO] [stderr]    Compiling thread_local v0.2.7
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling regex v0.1.80
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling chrono v0.2.25
[INFO] [stderr]    Compiling env_logger v0.3.5
[INFO] [stderr]    Compiling rusqlite v0.7.4
[INFO] [stderr]    Compiling timmy v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(question_mark)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `question_mark` has been stable since 1.13.0 and no longer requires an attribute to enable
[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 `timmy` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "1e2e5b2d7f47e7d90d63cf6b71bddc82d3ea4225c2b367677d46dff5ce1355a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e2e5b2d7f47e7d90d63cf6b71bddc82d3ea4225c2b367677d46dff5ce1355a1", kill_on_drop: false }`
[INFO] [stdout] 1e2e5b2d7f47e7d90d63cf6b71bddc82d3ea4225c2b367677d46dff5ce1355a1