[INFO] fetching crate ra-ap-rustc_arena 0.20.0...
[INFO] testing ra-ap-rustc_arena-0.20.0 against 1.75.0 for beta-1.76-1
[INFO] extracting crate ra-ap-rustc_arena 0.20.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate ra-ap-rustc_arena 0.20.0 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ra-ap-rustc_arena 0.20.0
[INFO] finished tweaking crates.io crate ra-ap-rustc_arena 0.20.0
[INFO] tweaked toml for crates.io crate ra-ap-rustc_arena 0.20.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 39fa6e22918a41fedb75f043108f4f566c2402af68f544fc17bcb583403ddc29
[INFO] running `Command { std: "docker" "start" "-a" "39fa6e22918a41fedb75f043108f4f566c2402af68f544fc17bcb583403ddc29", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "39fa6e22918a41fedb75f043108f4f566c2402af68f544fc17bcb583403ddc29", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39fa6e22918a41fedb75f043108f4f566c2402af68f544fc17bcb583403ddc29", kill_on_drop: false }`
[INFO] [stdout] 39fa6e22918a41fedb75f043108f4f566c2402af68f544fc17bcb583403ddc29
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a7ca2c854972411191c2da5a4eb7509ba5bdb42c8598f798aa4afa095d89fc73
[INFO] running `Command { std: "docker" "start" "-a" "a7ca2c854972411191c2da5a4eb7509ba5bdb42c8598f798aa4afa095d89fc73", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallvec v1.11.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/smallvec-1.11.2/src/lib.rs:96:37
[INFO] [stdout]    |
[INFO] [stdout] 96 | #![cfg_attr(feature = "may_dangle", feature(dropck_eyepatch))]
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `smallvec` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "a7ca2c854972411191c2da5a4eb7509ba5bdb42c8598f798aa4afa095d89fc73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7ca2c854972411191c2da5a4eb7509ba5bdb42c8598f798aa4afa095d89fc73", kill_on_drop: false }`
[INFO] [stdout] a7ca2c854972411191c2da5a4eb7509ba5bdb42c8598f798aa4afa095d89fc73
