[INFO] fetching crate wasmtime-lightbeam 0.21.0...
[INFO] testing wasmtime-lightbeam-0.21.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate wasmtime-lightbeam 0.21.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate wasmtime-lightbeam 0.21.0 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "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-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded derive_utils v0.11.1
[INFO] [stderr]   Downloaded capstone v0.6.0
[INFO] [stderr]   Downloaded iter-enum v0.2.6
[INFO] [stderr]   Downloaded dynasmrt v0.5.2
[INFO] [stderr]   Downloaded lightbeam v0.21.0
[INFO] [stderr]   Downloaded dynasm v0.5.2
[INFO] [stderr]   Downloaded capstone-sys v0.10.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d5fc72128dd29dcb4908ee0cc79101d6d73b1d825b6b03f995d817fc5e6d884
[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" "0d5fc72128dd29dcb4908ee0cc79101d6d73b1d825b6b03f995d817fc5e6d884", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d5fc72128dd29dcb4908ee0cc79101d6d73b1d825b6b03f995d817fc5e6d884", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d5fc72128dd29dcb4908ee0cc79101d6d73b1d825b6b03f995d817fc5e6d884", kill_on_drop: false }`
[INFO] [stdout] 0d5fc72128dd29dcb4908ee0cc79101d6d73b1d825b6b03f995d817fc5e6d884
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d4c305594568c383fbddca3989a13247ac17319f3dcf57535fe71e3c37ba96e4
[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" "d4c305594568c383fbddca3989a13247ac17319f3dcf57535fe71e3c37ba96e4", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling cranelift-codegen-shared v0.68.0
[INFO] [stderr]    Compiling target-lexicon v0.11.1
[INFO] [stderr]    Compiling fallible-iterator v0.2.0
[INFO] [stderr]    Compiling wasmparser v0.65.0
[INFO] [stderr]    Compiling staticvec v0.10.5
[INFO] [stderr]    Compiling capstone-sys v0.10.0
[INFO] [stderr]    Compiling regalloc v0.0.31
[INFO] [stderr]    Compiling 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" "d4c305594568c383fbddca3989a13247ac17319f3dcf57535fe71e3c37ba96e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4c305594568c383fbddca3989a13247ac17319f3dcf57535fe71e3c37ba96e4", kill_on_drop: false }`
[INFO] [stdout] d4c305594568c383fbddca3989a13247ac17319f3dcf57535fe71e3c37ba96e4