[INFO] fetching crate vcpu 0.2.0...
[INFO] testing vcpu-0.2.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate vcpu 0.2.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate vcpu 0.2.0
[INFO] finished tweaking crates.io crate vcpu 0.2.0
[INFO] tweaked toml for crates.io crate vcpu 0.2.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate vcpu 0.2.0 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 vcpu 0.2.0 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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded enumflags2 v0.7.9
[INFO] [stderr]   Downloaded thiserror v1.0.57
[INFO] [stderr]   Downloaded strum v0.26.1
[INFO] [stderr]   Downloaded enumflags2_derive v0.7.9
[INFO] [stderr]   Downloaded strum_macros v0.26.1
[INFO] [stderr]   Downloaded thiserror-impl v1.0.57
[INFO] [stderr]   Downloaded syn v2.0.49
[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] db24490e92d4074fc809dacc48837272fd9d5127cf8a0bcb50b5a235ec607418
[INFO] running `Command { std: "docker" "start" "-a" "db24490e92d4074fc809dacc48837272fd9d5127cf8a0bcb50b5a235ec607418", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "db24490e92d4074fc809dacc48837272fd9d5127cf8a0bcb50b5a235ec607418", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db24490e92d4074fc809dacc48837272fd9d5127cf8a0bcb50b5a235ec607418", kill_on_drop: false }`
[INFO] [stdout] db24490e92d4074fc809dacc48837272fd9d5127cf8a0bcb50b5a235ec607418
[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] 2535316ab728fc411834d901ccbc4415dd1fb98718eb11d04798b6a79115d91e
[INFO] running `Command { std: "docker" "start" "-a" "2535316ab728fc411834d901ccbc4415dd1fb98718eb11d04798b6a79115d91e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling thiserror v1.0.57
[INFO] [stderr]    Compiling either v1.10.0
[INFO] [stderr]    Compiling itertools v0.12.1
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling syn v2.0.49
[INFO] [stderr]    Compiling thiserror-impl v1.0.57
[INFO] [stderr]    Compiling strum_macros v0.26.1
[INFO] [stderr]    Compiling enumflags2_derive v0.7.9
[INFO] [stderr]    Compiling enumflags2 v0.7.9
[INFO] [stderr]    Compiling strum v0.26.1
[INFO] [stderr]    Compiling vcpu v0.2.0 (/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(bigint_helper_methods)]
[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 `vcpu` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "2535316ab728fc411834d901ccbc4415dd1fb98718eb11d04798b6a79115d91e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2535316ab728fc411834d901ccbc4415dd1fb98718eb11d04798b6a79115d91e", kill_on_drop: false }`
[INFO] [stdout] 2535316ab728fc411834d901ccbc4415dd1fb98718eb11d04798b6a79115d91e