[INFO] updating cached repository scturtle/turtlebot
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/scturtle/turtlebot
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/scturtle/turtlebot" "work/ex/beta-1.38-1/sources/1.37.0/gh/scturtle/turtlebot"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/scturtle/turtlebot'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/scturtle/turtlebot" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/scturtle/turtlebot"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/scturtle/turtlebot'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9b047d91beac80140d665af369e678cbf2885412
[INFO] sha for GitHub repo scturtle/turtlebot: 9b047d91beac80140d665af369e678cbf2885412
[INFO] validating manifest of scturtle/turtlebot on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of scturtle/turtlebot on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing scturtle/turtlebot
[INFO] finished frobbing scturtle/turtlebot
[INFO] frobbed toml for scturtle/turtlebot written to work/ex/beta-1.38-1/sources/1.37.0/gh/scturtle/turtlebot/Cargo.toml
[INFO] started frobbing scturtle/turtlebot
[INFO] finished frobbing scturtle/turtlebot
[INFO] frobbed toml for scturtle/turtlebot written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/scturtle/turtlebot/Cargo.toml
[INFO] crate scturtle/turtlebot already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing scturtle/turtlebot against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/scturtle/turtlebot:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 61c68eb9e4268ce09b35ea73efed8f0fb614594e1a22ff6f3ddfd1b2ea0c4c46
[INFO] running `"docker" "start" "-a" "61c68eb9e4268ce09b35ea73efed8f0fb614594e1a22ff6f3ddfd1b2ea0c4c46"`
[INFO] [stderr]    Compiling futures v0.1.26
[INFO] [stderr]    Compiling smallvec v0.3.4
[INFO] [stderr]    Compiling cssparser v0.13.7
[INFO] [stderr]    Compiling html5ever v0.20.0
[INFO] [stderr]    Compiling derive_builder_core v0.2.0
[INFO] [stderr]    Compiling syn v0.15.33
[INFO] [stderr]    Compiling serde_urlencoded v0.5.5
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling parse-zoneinfo v0.2.0
[INFO] [stderr]    Compiling env_logger v0.6.1
[INFO] [stderr]    Compiling markup5ever v0.5.0
[INFO] [stderr]    Compiling selectors v0.18.0
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]    Compiling string_cache v0.6.2
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling tokio-executor v0.1.7
[INFO] [stderr]    Compiling tokio-sync v0.1.5
[INFO] [stderr]    Compiling want v0.0.6
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling derive_builder v0.5.1
[INFO] [stderr]    Compiling tokio-codec v0.1.1
[INFO] [stderr]    Compiling tokio-async-await v0.1.7
[INFO] [stderr] error[E0432]: unresolved import `std::await`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-async-await-0.1.7/src/lib.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 | pub use std::await as std_await;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^ no `await` in the root
[INFO] [stderr] 
[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/tokio-async-await-0.1.7/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(rust_2018_preview, async_await, await_macro, futures_api)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling h2 v0.1.18
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `tokio-async-await`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "61c68eb9e4268ce09b35ea73efed8f0fb614594e1a22ff6f3ddfd1b2ea0c4c46"`
[INFO] running `"docker" "rm" "-f" "61c68eb9e4268ce09b35ea73efed8f0fb614594e1a22ff6f3ddfd1b2ea0c4c46"`
[INFO] [stdout] 61c68eb9e4268ce09b35ea73efed8f0fb614594e1a22ff6f3ddfd1b2ea0c4c46