[INFO] cloning repository rustyhorde/libechoexec
[INFO] running `"git" "clone" "--bare" "git://github.com/rustyhorde/libechoexec.git" "work/cache/sources/gh/rustyhorde/libechoexec"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/rustyhorde/libechoexec'...
[INFO] running `"git" "clone" "work/cache/sources/gh/rustyhorde/libechoexec" "work/ex/beta-1.37-6/sources/1.36.0/gh/rustyhorde/libechoexec"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/rustyhorde/libechoexec'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rustyhorde/libechoexec" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/rustyhorde/libechoexec"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/rustyhorde/libechoexec'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 532d95ea466461cce0d216dd429255b0b8540db9
[INFO] sha for GitHub repo rustyhorde/libechoexec: 532d95ea466461cce0d216dd429255b0b8540db9
[INFO] validating manifest of rustyhorde/libechoexec 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 rustyhorde/libechoexec 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 rustyhorde/libechoexec
[INFO] finished frobbing rustyhorde/libechoexec
[INFO] frobbed toml for rustyhorde/libechoexec written to work/ex/beta-1.37-6/sources/1.36.0/gh/rustyhorde/libechoexec/Cargo.toml
[INFO] started frobbing rustyhorde/libechoexec
[INFO] finished frobbing rustyhorde/libechoexec
[INFO] frobbed toml for rustyhorde/libechoexec written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/rustyhorde/libechoexec/Cargo.toml
[INFO] crate rustyhorde/libechoexec 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]     Updating git repository `https://github.com/hyperium/hyper`
[INFO] [stderr]     Updating git repository `https://github.com/hyperium/hyper-tls`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing rustyhorde/libechoexec 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-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/rustyhorde/libechoexec:/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] 799af073d81dc01fcb2b1f3f102ef8017c85435b8239944eaec93b107f531068
[INFO] running `"docker" "start" "-a" "799af073d81dc01fcb2b1f3f102ef8017c85435b8239944eaec93b107f531068"`
[INFO] [stderr]    Compiling syn v0.15.42
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.17
[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 tokio-sync v0.2.0 (https://github.com/tokio-rs/tokio#d038009e)
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling want v0.2.0 (https://github.com/seanmonstar/want?branch=std-future#23cd872e)
[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[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/git/checkouts/tokio-377c595163f99a10/d038009/tokio-sync/src/lib.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![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: 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 `tokio-sync`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "799af073d81dc01fcb2b1f3f102ef8017c85435b8239944eaec93b107f531068"`
[INFO] running `"docker" "rm" "-f" "799af073d81dc01fcb2b1f3f102ef8017c85435b8239944eaec93b107f531068"`
[INFO] [stdout] 799af073d81dc01fcb2b1f3f102ef8017c85435b8239944eaec93b107f531068