[INFO] updating cached repository https://github.com/heim-rs/heim-node-exporter
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9bab812e4e0fd214442b5c96d212bec7670a1e3d
[INFO] checking heim-rs/heim-node-exporter against try#8810c24b0958114d8dbb32d878444e8956fce80f for pr-66063
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fheim-rs%2Fheim-node-exporter" "/workspace/builds/worker-11/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/heim-rs/heim-node-exporter on toolchain 8810c24b0958114d8dbb32d878444e8956fce80f
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/heim-rs/heim-node-exporter
[INFO] finished tweaking git repo https://github.com/heim-rs/heim-node-exporter
[INFO] tweaked toml for git repo https://github.com/heim-rs/heim-node-exporter written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/heim-rs/heim-node-exporter already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+8810c24b0958114d8dbb32d878444e8956fce80f" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 2b137eb168c784b5526979e319b9e4652ed07dcbf64bdb56b36e8bb973c1f250
[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" "2b137eb168c784b5526979e319b9e4652ed07dcbf64bdb56b36e8bb973c1f250"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.17 (https://github.com/rust-lang-nursery/futures-rs.git?rev=049922dc4f26b0b3123a7824a72b4c109bebd86a#049922dc)
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.17 (https://github.com/rust-lang-nursery/futures-rs.git?rev=049922dc4f26b0b3123a7824a72b4c109bebd86a#049922dc)
[INFO] [stderr]    Compiling heim-common v0.0.6
[INFO] [stderr]    Compiling heim-host v0.0.6
[INFO] [stderr]    Compiling metrics v0.11.0
[INFO] [stderr]     Checking metrics-core v0.5.1
[INFO] [stderr]     Checking platforms v0.2.0
[INFO] [stderr]     Checking macaddr v0.1.1
[INFO] [stderr]    Compiling hyper v0.12.33
[INFO] [stderr]    Compiling raw-cpuid v6.1.0
[INFO] [stderr]    Compiling im v12.3.4
[INFO] [stderr]     Checking want v0.2.0
[INFO] [stderr]     Checking quanta v0.3.1
[INFO] [stderr]     Checking buf_redux v0.8.4
[INFO] [stderr]     Checking threadpool v1.7.1
[INFO] [stderr]     Checking sized-chunks v0.1.3
[INFO] [stderr]     Checking hdrhistogram v6.3.4
[INFO] [stderr]    Compiling proc-macro-hack v0.5.8
[INFO] [stderr]    Compiling heim-derive v0.0.6
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.17 (https://github.com/rust-lang-nursery/futures-rs.git?rev=049922dc4f26b0b3123a7824a72b4c109bebd86a#049922dc)
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking serde_qs v0.5.0
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking metrics-util v0.3.0
[INFO] [stderr]     Checking tokio-threadpool v0.1.15
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.17 (https://github.com/rust-lang-nursery/futures-rs.git?rev=049922dc4f26b0b3123a7824a72b4c109bebd86a#049922dc)
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]     Checking tokio-reactor v0.1.9
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]     Checking metrics-observer-prometheus v0.1.1
[INFO] [stderr]    Compiling mime_guess v1.8.7
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]    Compiling futures-join-macro-preview v0.3.0-alpha.17 (https://github.com/rust-lang-nursery/futures-rs.git?rev=049922dc4f26b0b3123a7824a72b4c109bebd86a#049922dc)
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.17 (https://github.com/rust-lang-nursery/futures-rs.git?rev=049922dc4f26b0b3123a7824a72b4c109bebd86a#049922dc)
[INFO] [stderr]     Checking metrics-runtime v0.1.0
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.17 (https://github.com/rust-lang-nursery/futures-rs.git?rev=049922dc4f26b0b3123a7824a72b4c109bebd86a#049922dc)
[INFO] [stderr]     Checking multipart v0.16.1
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/git/checkouts/futures-rs-4ca77cb4f4f05ac4/049922d/futures-util/src/lib.rs:4:38
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![cfg_attr(feature = "async-await", feature(async_await))]
[INFO] [stderr]   |                                      ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `futures-util-preview`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "2b137eb168c784b5526979e319b9e4652ed07dcbf64bdb56b36e8bb973c1f250"`
[INFO] running `"docker" "rm" "-f" "2b137eb168c784b5526979e319b9e4652ed07dcbf64bdb56b36e8bb973c1f250"`
[INFO] [stdout] 2b137eb168c784b5526979e319b9e4652ed07dcbf64bdb56b36e8bb973c1f250