[INFO] fetching crate wasmer-singlepass-backend 0.9.0...
[INFO] checking wasmer-singlepass-backend-0.9.0 against beta-2019-10-27 for pr-65897
[INFO] extracting crate wasmer-singlepass-backend 0.9.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate wasmer-singlepass-backend 0.9.0 on toolchain beta-2019-10-27
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate wasmer-singlepass-backend 0.9.0
[INFO] finished tweaking crates.io crate wasmer-singlepass-backend 0.9.0
[INFO] tweaked toml for crates.io crate wasmer-singlepass-backend 0.9.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=allow" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-10-27" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] d6e056151bf5459f30b76c6e1e88bdc780b8febad807eb4e266dd5212a73e9a9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "d6e056151bf5459f30b76c6e1e88bdc780b8febad807eb4e266dd5212a73e9a9"`
[INFO] [stderr]    Compiling constant_time_eq v0.1.4
[INFO] [stderr]     Checking wasmparser v0.39.2
[INFO] [stderr]    Compiling owning_ref v0.3.3
[INFO] [stderr]     Checking serde_bytes v0.11.2
[INFO] [stderr]     Checking indexmap v1.3.0
[INFO] [stderr]     Checking serde-bench v0.0.7
[INFO] [stderr]     Checking blake2b_simd v0.5.8
[INFO] [stderr]     Checking page_size v0.4.1
[INFO] [stderr]     Checking dynasmrt v0.3.1
[INFO] [stderr]    Compiling dynasm v0.3.2
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/dynasm-0.3.2/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro_diagnostic)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/dynasm-0.3.2/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(proc_macro_span)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling wasmer-runtime-core v0.9.0
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `dynasm`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "d6e056151bf5459f30b76c6e1e88bdc780b8febad807eb4e266dd5212a73e9a9"`
[INFO] running `"docker" "rm" "-f" "d6e056151bf5459f30b76c6e1e88bdc780b8febad807eb4e266dd5212a73e9a9"`
[INFO] [stdout] d6e056151bf5459f30b76c6e1e88bdc780b8febad807eb4e266dd5212a73e9a9