[INFO] fetching crate overflower_support 0.1.5...
[INFO] testing overflower_support-0.1.5 against 1.60.0 for beta-1.61-1
[INFO] extracting crate overflower_support 0.1.5 into /workspace/builds/worker-16/source
[INFO] validating manifest of crates.io crate overflower_support 0.1.5 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate overflower_support 0.1.5
[INFO] finished tweaking crates.io crate overflower_support 0.1.5
[INFO] tweaked toml for crates.io crate overflower_support 0.1.5 written to /workspace/builds/worker-16/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded env_logger v0.3.5
[INFO] [stderr]   Downloaded quickcheck v0.2.27
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6d3eae1a7b4131f06f5ea7e05751456c12c54770a245d9fd7d9b3e3f31322e3a
[INFO] running `Command { std: "docker" "start" "-a" "6d3eae1a7b4131f06f5ea7e05751456c12c54770a245d9fd7d9b3e3f31322e3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d3eae1a7b4131f06f5ea7e05751456c12c54770a245d9fd7d9b3e3f31322e3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d3eae1a7b4131f06f5ea7e05751456c12c54770a245d9fd7d9b3e3f31322e3a", kill_on_drop: false }`
[INFO] [stdout] 6d3eae1a7b4131f06f5ea7e05751456c12c54770a245d9fd7d9b3e3f31322e3a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3570fb8c518ce1402dc0aee24e1b3259566b25f2a932b9a23a8a9ede1a461c4c
[INFO] running `Command { std: "docker" "start" "-a" "3570fb8c518ce1402dc0aee24e1b3259566b25f2a932b9a23a8a9ede1a461c4c", kill_on_drop: false }`
[INFO] [stderr]    Compiling overflower_support v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![feature(specialization)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]   --> src/lib.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | #![feature(specialization)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]    = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]    = help: consider using `min_specialization` instead, which is more stable and complete
[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 `overflower_support` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "3570fb8c518ce1402dc0aee24e1b3259566b25f2a932b9a23a8a9ede1a461c4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3570fb8c518ce1402dc0aee24e1b3259566b25f2a932b9a23a8a9ede1a461c4c", kill_on_drop: false }`
[INFO] [stdout] 3570fb8c518ce1402dc0aee24e1b3259566b25f2a932b9a23a8a9ede1a461c4c