[INFO] updating cached repository pbzweihander/proxylab-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/pbzweihander/proxylab-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/pbzweihander/proxylab-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/pbzweihander/proxylab-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/pbzweihander/proxylab-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/pbzweihander/proxylab-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pbzweihander/proxylab-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pbzweihander/proxylab-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b901a91326208f48fdab315123f367faf9fbe6a3
[INFO] sha for GitHub repo pbzweihander/proxylab-rs: b901a91326208f48fdab315123f367faf9fbe6a3
[INFO] validating manifest of pbzweihander/proxylab-rs 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 pbzweihander/proxylab-rs 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 pbzweihander/proxylab-rs
[INFO] finished frobbing pbzweihander/proxylab-rs
[INFO] frobbed toml for pbzweihander/proxylab-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/pbzweihander/proxylab-rs/Cargo.toml
[INFO] started frobbing pbzweihander/proxylab-rs
[INFO] finished frobbing pbzweihander/proxylab-rs
[INFO] frobbed toml for pbzweihander/proxylab-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pbzweihander/proxylab-rs/Cargo.toml
[INFO] crate pbzweihander/proxylab-rs 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 pbzweihander/proxylab-rs against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pbzweihander/proxylab-rs:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 32eec37ae7e68d4b5f0927641440723bb9a526c1cff0729f4125e7f79ed15840
[INFO] running `"docker" "start" "-a" "32eec37ae7e68d4b5f0927641440723bb9a526c1cff0729f4125e7f79ed15840"`
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.3
[INFO] [stderr]    Compiling crossbeam-epoch v0.6.1
[INFO] [stderr]    Compiling mio v0.6.16
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]    Compiling tokio-io v0.1.10
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/pin-utils-0.1.0-alpha.3/src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(pin)]
[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 `pin-utils`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "32eec37ae7e68d4b5f0927641440723bb9a526c1cff0729f4125e7f79ed15840"`
[INFO] running `"docker" "rm" "-f" "32eec37ae7e68d4b5f0927641440723bb9a526c1cff0729f4125e7f79ed15840"`
[INFO] [stdout] 32eec37ae7e68d4b5f0927641440723bb9a526c1cff0729f4125e7f79ed15840