[INFO] updating cached repository fredhsu/rusteapi
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/fredhsu/rusteapi
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/fredhsu/rusteapi" "work/ex/beta-1.37-6/sources/1.36.0/gh/fredhsu/rusteapi"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/fredhsu/rusteapi'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/fredhsu/rusteapi" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/fredhsu/rusteapi"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/fredhsu/rusteapi'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 817b6ce96864c4ae67a33972604a190b5959abca
[INFO] sha for GitHub repo fredhsu/rusteapi: 817b6ce96864c4ae67a33972604a190b5959abca
[INFO] validating manifest of fredhsu/rusteapi 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 fredhsu/rusteapi 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 fredhsu/rusteapi
[INFO] finished frobbing fredhsu/rusteapi
[INFO] frobbed toml for fredhsu/rusteapi written to work/ex/beta-1.37-6/sources/1.36.0/gh/fredhsu/rusteapi/Cargo.toml
[INFO] started frobbing fredhsu/rusteapi
[INFO] finished frobbing fredhsu/rusteapi
[INFO] frobbed toml for fredhsu/rusteapi written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/fredhsu/rusteapi/Cargo.toml
[INFO] crate fredhsu/rusteapi 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] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/fredhsu/rusteapi/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Updating git repository `https://github.com/hyperium/hyper`
[INFO] [stderr]     Updating git repository `https://github.com/tokio-rs/tokio`
[INFO] [stderr]     Updating git repository `https://github.com/seanmonstar/want`
[INFO] [stderr]     Updating git repository `https://github.com/stjepang/crossbeam`
[INFO] [stderr]     Updating git repository `https://github.com/tokio-rs/async`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating git repository `https://github.com/hyperium/hyper`
[INFO] [stderr]     Updating git repository `https://github.com/tokio-rs/tokio`
[INFO] [stderr]     Updating git repository `https://github.com/seanmonstar/want`
[INFO] [stderr]     Updating git repository `https://github.com/stjepang/crossbeam`
[INFO] [stderr]     Updating git repository `https://github.com/tokio-rs/async`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[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] testing fredhsu/rusteapi 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-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/fredhsu/rusteapi:/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] 4bdb103f062eff6e088b7296722d4d01e5a562b2635aa7250c6d22082572936d
[INFO] running `"docker" "start" "-a" "4bdb103f062eff6e088b7296722d4d01e5a562b2635aa7250c6d22082572936d"`
[INFO] [stderr]    Compiling syn v0.15.42
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling async-util v0.1.0 (https://github.com/tokio-rs/async#e1b3ba3d)
[INFO] [stderr]    Compiling arc-waker v0.1.0 (https://github.com/tokio-rs/async#e1b3ba3d)
[INFO] [stderr]    Compiling crossbeam-utils v0.6.5 (https://github.com/stjepang/crossbeam?branch=raw-parker#e2a7760f)
[INFO] [stderr]    Compiling tracing-core v0.1.2
[INFO] [stderr]    Compiling want v0.2.0 (https://github.com/seanmonstar/want?branch=std-future#23cd872e)
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/want-51aa3bbe7c1b17c7/23cd872/src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![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 `want`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4bdb103f062eff6e088b7296722d4d01e5a562b2635aa7250c6d22082572936d"`
[INFO] running `"docker" "rm" "-f" "4bdb103f062eff6e088b7296722d4d01e5a562b2635aa7250c6d22082572936d"`
[INFO] [stdout] 4bdb103f062eff6e088b7296722d4d01e5a562b2635aa7250c6d22082572936d