[INFO] fetching crate wasmtime-lightbeam 0.21.0...
[INFO] checking wasmtime-lightbeam-0.21.0 against beta for pr-78714
[INFO] extracting crate wasmtime-lightbeam 0.21.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate wasmtime-lightbeam 0.21.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate wasmtime-lightbeam 0.21.0
[INFO] finished tweaking crates.io crate wasmtime-lightbeam 0.21.0
[INFO] tweaked toml for crates.io crate wasmtime-lightbeam 0.21.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1d6da63db15ff0ae38f804e93d747663cd24c5e06878993ad64a4a4798c0e8b3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1d6da63db15ff0ae38f804e93d747663cd24c5e06878993ad64a4a4798c0e8b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1d6da63db15ff0ae38f804e93d747663cd24c5e06878993ad64a4a4798c0e8b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d6da63db15ff0ae38f804e93d747663cd24c5e06878993ad64a4a4798c0e8b3", kill_on_drop: false }`
[INFO] [stdout] 1d6da63db15ff0ae38f804e93d747663cd24c5e06878993ad64a4a4798c0e8b3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=forbid" "-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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 05e2e87c7650f6c8b2f50788c01e1895deca333da67f096c474eb76dab6ae2ec
[INFO] running `Command { std: "docker" "start" "-a" "05e2e87c7650f6c8b2f50788c01e1895deca333da67f096c474eb76dab6ae2ec", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]     Checking staticvec v0.10.5
[INFO] [stderr]    Compiling capstone-sys v0.10.0
[INFO] [stderr]    Compiling owning_ref v0.4.1
[INFO] [stderr]     Checking dynasmrt v0.5.2
[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/staticvec-0.10.5/src/lib.rs:31:1
[INFO] [stdout]    |
[INFO] [stdout] 31 | / #![feature(
[INFO] [stdout] 32 | |   const_fn,
[INFO] [stdout] 33 | |   const_fn_union,
[INFO] [stdout] 34 | |   const_generics,
[INFO] [stdout] ...  |
[INFO] [stdout] 51 | |   untagged_unions
[INFO] [stdout] 52 | | )]
[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/staticvec-0.10.5/src/lib.rs:53:30
[INFO] [stdout]    |
[INFO] [stdout] 53 | #![cfg_attr(feature = "std", feature(read_initializer))]
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `staticvec`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "05e2e87c7650f6c8b2f50788c01e1895deca333da67f096c474eb76dab6ae2ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05e2e87c7650f6c8b2f50788c01e1895deca333da67f096c474eb76dab6ae2ec", kill_on_drop: false }`
[INFO] [stdout] 05e2e87c7650f6c8b2f50788c01e1895deca333da67f096c474eb76dab6ae2ec