[INFO] fetching crate cortex 0.1.5...
[INFO] testing cortex-0.1.5 against 1.55.0 for beta-1.56-1
[INFO] extracting crate cortex 0.1.5 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate cortex 0.1.5 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 cortex 0.1.5
[INFO] finished tweaking crates.io crate cortex 0.1.5
[INFO] tweaked toml for crates.io crate cortex 0.1.5 written to /workspace/builds/worker-5/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 25ebe350b9b036e67bc884dcfb3788fd9b062a6eabc0eecd19dfa944e7f82f54
[INFO] running `Command { std: "docker" "start" "-a" "25ebe350b9b036e67bc884dcfb3788fd9b062a6eabc0eecd19dfa944e7f82f54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "25ebe350b9b036e67bc884dcfb3788fd9b062a6eabc0eecd19dfa944e7f82f54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25ebe350b9b036e67bc884dcfb3788fd9b062a6eabc0eecd19dfa944e7f82f54", kill_on_drop: false }`
[INFO] [stdout] 25ebe350b9b036e67bc884dcfb3788fd9b062a6eabc0eecd19dfa944e7f82f54
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] bb906eafd7ba85ead17faf63b2afb634e3c8ad0dde98b5dc67e5e17a53f81d2a
[INFO] running `Command { std: "docker" "start" "-a" "bb906eafd7ba85ead17faf63b2afb634e3c8ad0dde98b5dc67e5e17a53f81d2a", kill_on_drop: false }`
[INFO] [stderr]    Compiling cortex v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0277]: the size for values of type `Self` cannot be known at compilation time
[INFO] [stdout]   --> src/cortex/mod.rs:24:37
[INFO] [stdout]    |
[INFO] [stdout] 4  | pub struct Cortex<T: Debug, X: Observer<T>> {
[INFO] [stdout]    |                             - required by this bound in `Cortex`
[INFO] [stdout] ...
[INFO] [stdout] 24 |     fn register(&mut self, cortex: Box<Cortex<T, Self>>) { }
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
[INFO] [stdout]    |
[INFO] [stdout] help: consider further restricting `Self`
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn register(&mut self, cortex: Box<Cortex<T, Self>>) where Self: Sized { }
[INFO] [stdout]    |                                                          ^^^^^^^^^^^^^^^^^
[INFO] [stdout] help: consider relaxing the implicit `Sized` restriction
[INFO] [stdout]    |
[INFO] [stdout] 4  | pub struct Cortex<T: Debug, X: Observer<T> + ?Sized> {
[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 E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cortex` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "bb906eafd7ba85ead17faf63b2afb634e3c8ad0dde98b5dc67e5e17a53f81d2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb906eafd7ba85ead17faf63b2afb634e3c8ad0dde98b5dc67e5e17a53f81d2a", kill_on_drop: false }`
[INFO] [stdout] bb906eafd7ba85ead17faf63b2afb634e3c8ad0dde98b5dc67e5e17a53f81d2a