[INFO] fetching crate rlibcex 0.1.2...
[INFO] testing rlibcex-0.1.2 against 1.54.0 for beta-1.55-1
[INFO] extracting crate rlibcex 0.1.2 into /workspace/builds/worker-28/source
[INFO] validating manifest of crates.io crate rlibcex 0.1.2 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 rlibcex 0.1.2
[INFO] finished tweaking crates.io crate rlibcex 0.1.2
[INFO] tweaked toml for crates.io crate rlibcex 0.1.2 written to /workspace/builds/worker-28/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-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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] 43e5e142989c8bc62500f8501dc975a73961eb9930848bc1d490343dff9284d3
[INFO] running `Command { std: "docker" "start" "-a" "43e5e142989c8bc62500f8501dc975a73961eb9930848bc1d490343dff9284d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43e5e142989c8bc62500f8501dc975a73961eb9930848bc1d490343dff9284d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43e5e142989c8bc62500f8501dc975a73961eb9930848bc1d490343dff9284d3", kill_on_drop: false }`
[INFO] [stdout] 43e5e142989c8bc62500f8501dc975a73961eb9930848bc1d490343dff9284d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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] af9c35a4e460c496a078dff10e6fa992349e9a1187ece04c41d3e457afcee23c
[INFO] running `Command { std: "docker" "start" "-a" "af9c35a4e460c496a078dff10e6fa992349e9a1187ece04c41d3e457afcee23c", kill_on_drop: false }`
[INFO] [stderr]    Compiling rlibcex v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.16s
[INFO] running `Command { std: "docker" "inspect" "af9c35a4e460c496a078dff10e6fa992349e9a1187ece04c41d3e457afcee23c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af9c35a4e460c496a078dff10e6fa992349e9a1187ece04c41d3e457afcee23c", kill_on_drop: false }`
[INFO] [stdout] af9c35a4e460c496a078dff10e6fa992349e9a1187ece04c41d3e457afcee23c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 70245dc4f3a731632e61d89ac63a20add80a88a72001070da8200c62f3709935
[INFO] running `Command { std: "docker" "start" "-a" "70245dc4f3a731632e61d89ac63a20add80a88a72001070da8200c62f3709935", kill_on_drop: false }`
[INFO] [stderr]    Compiling rlibcex v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:19
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![cfg_attr(test, feature(test))]
[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 `rlibcex`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "70245dc4f3a731632e61d89ac63a20add80a88a72001070da8200c62f3709935", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70245dc4f3a731632e61d89ac63a20add80a88a72001070da8200c62f3709935", kill_on_drop: false }`
[INFO] [stdout] 70245dc4f3a731632e61d89ac63a20add80a88a72001070da8200c62f3709935
