[INFO] fetching crate tagged_ptr 0.1.0...
[INFO] testing tagged_ptr-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate tagged_ptr 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate tagged_ptr 0.1.0 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 tagged_ptr 0.1.0
[INFO] finished tweaking crates.io crate tagged_ptr 0.1.0
[INFO] tweaked toml for crates.io crate tagged_ptr 0.1.0 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] 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] 5bb37f1e5fa70f64fe0e75bed81f376c44e95285828f3ea62859b9abcea52e9d
[INFO] running `Command { std: "docker" "start" "-a" "5bb37f1e5fa70f64fe0e75bed81f376c44e95285828f3ea62859b9abcea52e9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5bb37f1e5fa70f64fe0e75bed81f376c44e95285828f3ea62859b9abcea52e9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bb37f1e5fa70f64fe0e75bed81f376c44e95285828f3ea62859b9abcea52e9d", kill_on_drop: false }`
[INFO] [stdout] 5bb37f1e5fa70f64fe0e75bed81f376c44e95285828f3ea62859b9abcea52e9d
[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] [stdout] d4fe794f4af819d2c06556d98416c4dfa1f2ec1bf2c70c17c8eb6203af8aef18
[INFO] running `Command { std: "docker" "start" "-a" "d4fe794f4af819d2c06556d98416c4dfa1f2ec1bf2c70c17c8eb6203af8aef18", kill_on_drop: false }`
[INFO] [stderr]    Compiling tagged_ptr v0.1.0 (/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(rc_raw)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/packable3.rs:12:22
[INFO] [stdout]    |
[INFO] [stdout] 12 |     unsafe fn unpack(usize) -> Self;
[INFO] [stdout]    |                      ^^^^^ help: try naming the parameter or explicitly ignoring it: `_: usize`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning 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 `tagged_ptr` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "d4fe794f4af819d2c06556d98416c4dfa1f2ec1bf2c70c17c8eb6203af8aef18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4fe794f4af819d2c06556d98416c4dfa1f2ec1bf2c70c17c8eb6203af8aef18", kill_on_drop: false }`
[INFO] [stdout] d4fe794f4af819d2c06556d98416c4dfa1f2ec1bf2c70c17c8eb6203af8aef18