[INFO] cloning repository leo60228/perf-checkup
[INFO] running `"git" "clone" "--bare" "git://github.com/leo60228/perf-checkup.git" "work/cache/sources/gh/leo60228/perf-checkup"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/leo60228/perf-checkup'...
[INFO] running `"git" "clone" "work/cache/sources/gh/leo60228/perf-checkup" "work/ex/beta-1.37-6/sources/1.36.0/gh/leo60228/perf-checkup"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/leo60228/perf-checkup'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/leo60228/perf-checkup" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/leo60228/perf-checkup"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/leo60228/perf-checkup'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 40e2412ae66da1a775c9e66a0f5fac43cc4d31b1
[INFO] sha for GitHub repo leo60228/perf-checkup: 40e2412ae66da1a775c9e66a0f5fac43cc4d31b1
[INFO] validating manifest of leo60228/perf-checkup on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of leo60228/perf-checkup on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing leo60228/perf-checkup
[INFO] finished frobbing leo60228/perf-checkup
[INFO] frobbed toml for leo60228/perf-checkup written to work/ex/beta-1.37-6/sources/1.36.0/gh/leo60228/perf-checkup/Cargo.toml
[INFO] started frobbing leo60228/perf-checkup
[INFO] finished frobbing leo60228/perf-checkup
[INFO] frobbed toml for leo60228/perf-checkup written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/leo60228/perf-checkup/Cargo.toml
[INFO] crate leo60228/perf-checkup already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded snafu v0.4.3
[INFO] [stderr]   Downloaded heim-net v0.0.5
[INFO] [stderr]   Downloaded heim v0.0.5
[INFO] [stderr]   Downloaded heim-virt v0.0.5
[INFO] [stderr]   Downloaded snafu-derive v0.4.3
[INFO] [stderr]   Downloaded heim-memory v0.0.5
[INFO] [stderr]   Downloaded heim-common v0.0.5
[INFO] [stderr]   Downloaded heim-process v0.0.5
[INFO] [stderr]   Downloaded macaddr v0.1.1
[INFO] [stderr]   Downloaded heim-disk v0.0.5
[INFO] [stderr]   Downloaded mach v0.3.2
[INFO] [stderr]   Downloaded heim-cpu v0.0.5
[INFO] [stderr]   Downloaded heim-host v0.0.5
[INFO] [stderr]   Downloaded heim-derive v0.0.5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing leo60228/perf-checkup against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/leo60228/perf-checkup:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] e998b577d4da956014e654c8a2cc623e1044f943236bf0beecef7bfaad5656db
[INFO] running `"docker" "start" "-a" "e998b577d4da956014e654c8a2cc623e1044f943236bf0beecef7bfaad5656db"`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling heim-common v0.0.5
[INFO] [stderr]    Compiling doc-comment v0.3.1
[INFO] [stderr]    Compiling async-datagram v3.0.0
[INFO] [stderr]    Compiling async-ready v3.0.0
[INFO] [stderr]    Compiling heim-host v0.0.5
[INFO] [stderr]    Compiling platforms v0.2.0
[INFO] [stderr]    Compiling async-datagram v2.2.0
[INFO] [stderr]    Compiling macaddr v0.1.1
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/async-datagram-2.2.0/src/lib.rs:43:1
[INFO] [stderr]    |
[INFO] [stderr] 43 | #![feature(futures_api)]
[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 `async-datagram`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "e998b577d4da956014e654c8a2cc623e1044f943236bf0beecef7bfaad5656db"`
[INFO] running `"docker" "rm" "-f" "e998b577d4da956014e654c8a2cc623e1044f943236bf0beecef7bfaad5656db"`
[INFO] [stdout] e998b577d4da956014e654c8a2cc623e1044f943236bf0beecef7bfaad5656db