[INFO] fetching crate extar 0.1.1...
[INFO] testing extar-0.1.1 against 1.54.0 for beta-1.55-1
[INFO] extracting crate extar 0.1.1 into /workspace/builds/worker-18/source
[INFO] validating manifest of crates.io crate extar 0.1.1 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate extar 0.1.1
[INFO] finished tweaking crates.io crate extar 0.1.1
[INFO] tweaked toml for crates.io crate extar 0.1.1 written to /workspace/builds/worker-18/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d2099db08fe4c2fa0a10b7063c363b3f2773d59749d46b52b3cbbcd32277bb2
[INFO] running `Command { std: "docker" "start" "-a" "0d2099db08fe4c2fa0a10b7063c363b3f2773d59749d46b52b3cbbcd32277bb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d2099db08fe4c2fa0a10b7063c363b3f2773d59749d46b52b3cbbcd32277bb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d2099db08fe4c2fa0a10b7063c363b3f2773d59749d46b52b3cbbcd32277bb2", kill_on_drop: false }`
[INFO] [stdout] 0d2099db08fe4c2fa0a10b7063c363b3f2773d59749d46b52b3cbbcd32277bb2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] da733f063a350870c9e4e87a387c4b654695f966fd87397842d19e868c8928ea
[INFO] running `Command { std: "docker" "start" "-a" "da733f063a350870c9e4e87a387c4b654695f966fd87397842d19e868c8928ea", kill_on_drop: false }`
[INFO] [stderr]    Compiling extar v0.1.1 (/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(align_offset)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:82:21
[INFO] [stdout]    |
[INFO] [stdout] 82 |   buffer:   &'a mut RawBufferedTarExt,
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn RawBufferedTarExt`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[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 `extar`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "da733f063a350870c9e4e87a387c4b654695f966fd87397842d19e868c8928ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da733f063a350870c9e4e87a387c4b654695f966fd87397842d19e868c8928ea", kill_on_drop: false }`
[INFO] [stdout] da733f063a350870c9e4e87a387c4b654695f966fd87397842d19e868c8928ea
