[INFO] fetching crate flatrv-interp 0.1.0...
[INFO] testing flatrv-interp-0.1.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate flatrv-interp 0.1.0 into /workspace/builds/worker-101/source
[INFO] validating manifest of crates.io crate flatrv-interp 0.1.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate flatrv-interp 0.1.0
[INFO] finished tweaking crates.io crate flatrv-interp 0.1.0
[INFO] tweaked toml for crates.io crate flatrv-interp 0.1.0 written to /workspace/builds/worker-101/source/Cargo.toml
[INFO] crate crates.io crate flatrv-interp 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 217df2a9997ae3082699777b9e89a94e587dec455f23b7c905f380521b5f75bb
[INFO] running `Command { std: "docker" "start" "-a" "217df2a9997ae3082699777b9e89a94e587dec455f23b7c905f380521b5f75bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "217df2a9997ae3082699777b9e89a94e587dec455f23b7c905f380521b5f75bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "217df2a9997ae3082699777b9e89a94e587dec455f23b7c905f380521b5f75bb", kill_on_drop: false }`
[INFO] [stdout] 217df2a9997ae3082699777b9e89a94e587dec455f23b7c905f380521b5f75bb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 571f64202aa3f50f99bb8db59eecb4f1f215e6500108b7d00d564b5706ee4c6f
[INFO] running `Command { std: "docker" "start" "-a" "571f64202aa3f50f99bb8db59eecb4f1f215e6500108b7d00d564b5706ee4c6f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling plain v0.2.3
[INFO] [stderr]    Compiling nix v0.16.1
[INFO] [stderr]    Compiling scroll v0.10.1
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling goblin v0.1.3
[INFO] [stderr]    Compiling flatrv v0.1.0
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/flatrv-0.1.0/src/lib.rs:2:29
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(core_intrinsics, const_fn)]
[INFO] [stdout]   |                             ^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: flatrv depends on release mode for correctness
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/flatrv-0.1.0/src/lib.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     compile_error!("flatrv depends on release mode for correctness");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/flatrv-0.1.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(core_intrinsics, const_fn)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `flatrv` due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "571f64202aa3f50f99bb8db59eecb4f1f215e6500108b7d00d564b5706ee4c6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "571f64202aa3f50f99bb8db59eecb4f1f215e6500108b7d00d564b5706ee4c6f", kill_on_drop: false }`
[INFO] [stdout] 571f64202aa3f50f99bb8db59eecb4f1f215e6500108b7d00d564b5706ee4c6f