[INFO] fetching crate synco 0.0.0...
[INFO] testing synco-0.0.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate synco 0.0.0 into /workspace/builds/worker-73/source
[INFO] validating manifest of crates.io crate synco 0.0.0 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 synco 0.0.0
[INFO] finished tweaking crates.io crate synco 0.0.0
[INFO] tweaked toml for crates.io crate synco 0.0.0 written to /workspace/builds/worker-73/source/Cargo.toml
[INFO] crate crates.io crate synco 0.0.0 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]  Downloading crates ...
[INFO] [stderr]   Downloaded anymap v0.12.1
[INFO] [stderr]   Downloaded shred v0.10.2
[INFO] [stderr]   Downloaded tynm v0.1.6
[INFO] [stderr]   Downloaded tuple_utils v0.3.0
[INFO] [stderr]   Downloaded specs v0.16.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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] 085188b507c8cc80fa063ef93beab9221ae0c6cf5feee99f259db378d8f5452e
[INFO] running `Command { std: "docker" "start" "-a" "085188b507c8cc80fa063ef93beab9221ae0c6cf5feee99f259db378d8f5452e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "085188b507c8cc80fa063ef93beab9221ae0c6cf5feee99f259db378d8f5452e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "085188b507c8cc80fa063ef93beab9221ae0c6cf5feee99f259db378d8f5452e", kill_on_drop: false }`
[INFO] [stdout] 085188b507c8cc80fa063ef93beab9221ae0c6cf5feee99f259db378d8f5452e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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] 2ba4b84f0c668d143a80c440d1e72a38740d962044a434d796f75390998331c3
[INFO] running `Command { std: "docker" "start" "-a" "2ba4b84f0c668d143a80c440d1e72a38740d962044a434d796f75390998331c3", kill_on_drop: false }`
[INFO] [stderr]    Compiling anymap v0.12.1
[INFO] [stderr]    Compiling synco v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     generic_associated_types,
[INFO] [stdout] 3 | |     maybe_uninit_ref,
[INFO] [stdout] 4 | |     maybe_uninit_extra,
[INFO] [stdout] ... |
[INFO] [stdout] 8 | |     fn_traits,
[INFO] [stdout] 9 | | )]
[INFO] [stdout]   | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]  --> src/entity.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::*;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ref`
[INFO] [stdout]  --> src/query.rs:4:24
[INFO] [stdout]   |
[INFO] [stdout] 4 |     cell::{UnsafeCell, Ref},
[INFO] [stdout]   |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/query.rs:156:20
[INFO] [stdout]     |
[INFO] [stdout] 156 |                 };);*
[INFO] [stdout]     |                    ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/query.rs:156:20
[INFO] [stdout]     |
[INFO] [stdout] 156 |                 };);*
[INFO] [stdout]     |                    ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `synco` due to 2 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "2ba4b84f0c668d143a80c440d1e72a38740d962044a434d796f75390998331c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ba4b84f0c668d143a80c440d1e72a38740d962044a434d796f75390998331c3", kill_on_drop: false }`
[INFO] [stdout] 2ba4b84f0c668d143a80c440d1e72a38740d962044a434d796f75390998331c3