[INFO] fetching crate inplace-box 0.2.1...
[INFO] testing inplace-box-0.2.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate inplace-box 0.2.1 into /workspace/builds/worker-0-tc1/source
[INFO] removed /workspace/builds/worker-0-tc1/source/rust-toolchain
[INFO] started tweaking crates.io crate inplace-box 0.2.1
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate inplace-box 0.2.1
[INFO] tweaked toml for crates.io crate inplace-box 0.2.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate inplace-box 0.2.1 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate inplace-box 0.2.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dc1d9cbfff8a121765420125be6eb8303540779a4aa327bb2b9031413546801b
[INFO] running `Command { std: "docker" "start" "-a" "dc1d9cbfff8a121765420125be6eb8303540779a4aa327bb2b9031413546801b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dc1d9cbfff8a121765420125be6eb8303540779a4aa327bb2b9031413546801b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc1d9cbfff8a121765420125be6eb8303540779a4aa327bb2b9031413546801b", kill_on_drop: false }`
[INFO] [stdout] dc1d9cbfff8a121765420125be6eb8303540779a4aa327bb2b9031413546801b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 08feae275a4b2326c5f7de9095c94bea325c3d59e095e4a75f0b64e659b22cb8
[INFO] running `Command { std: "docker" "start" "-a" "08feae275a4b2326c5f7de9095c94bea325c3d59e095e4a75f0b64e659b22cb8", kill_on_drop: false }`
[INFO] [stderr]    Compiling inplace-box v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:2:1
[INFO] [stdout]    |
[INFO] [stdout]  2 | / #![feature(
[INFO] [stdout]  3 | |     allocator_api,    // for Box::from_raw_in
[INFO] [stdout]  4 | |     coerce_unsized,
[INFO] [stdout]  5 | |     fn_traits,        // for forwarding `Fn` in `InplaceBox`
[INFO] [stdout] ...  |
[INFO] [stdout] 13 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `inplace-box` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "08feae275a4b2326c5f7de9095c94bea325c3d59e095e4a75f0b64e659b22cb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08feae275a4b2326c5f7de9095c94bea325c3d59e095e4a75f0b64e659b22cb8", kill_on_drop: false }`
[INFO] [stdout] 08feae275a4b2326c5f7de9095c94bea325c3d59e095e4a75f0b64e659b22cb8