[INFO] updating cached repository https://github.com/mit-pdos/distributary-mysql
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8594d05f2f96a060d6aeafb9a2c8f11f5a7be3d3
[INFO] testing mit-pdos/distributary-mysql against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmit-pdos%2Fdistributary-mysql" "work/builds/worker-5/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mit-pdos/distributary-mysql on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/mit-pdos/distributary-mysql
[INFO] finished tweaking git repo https://github.com/mit-pdos/distributary-mysql
[INFO] tweaked toml for git repo https://github.com/mit-pdos/distributary-mysql written to work/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/mit-pdos/distributary-mysql already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "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] running `"docker" "create" "-v" "/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 65e5108bfe8410ffed1cd5d8a33a0f0c4b191573407771e67cb7f7fec87309d2
[INFO] running `"docker" "start" "-a" "65e5108bfe8410ffed1cd5d8a33a0f0c4b191573407771e67cb7f7fec87309d2"`
[INFO] [stderr]    Compiling static_assertions v0.3.4
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]    Compiling regex-syntax v0.6.12
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-bigint v0.2.3
[INFO] [stderr]    Compiling tower-service v0.2.0
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling c2-chacha v0.2.2
[INFO] [stderr]    Compiling tracing-core v0.1.5
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling lock_api v0.3.1
[INFO] [stderr]    Compiling bincode v1.1.4
[INFO] [stderr]    Compiling stackvector v1.0.7
[INFO] [stderr]    Compiling lexical-core v0.4.3
[INFO] [stderr]    Compiling lexical v2.2.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling getrandom v0.1.11
[INFO] [stderr]    Compiling signal-hook-registry v1.1.1
[INFO] [stderr]    Compiling tower-discover v0.1.0
[INFO] [stderr]    Compiling tower-layer v0.1.0
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling tracing-log v0.1.0
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling tokio-executor v0.1.8
[INFO] [stderr]    Compiling crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling tower-load-shed v0.1.0
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling signal-hook v0.1.10
[INFO] [stderr]    Compiling tokio-timer v0.2.11
[INFO] [stderr]    Compiling tokio-current-thread v0.1.6
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling http v0.1.18
[INFO] [stderr]    Compiling tokio-buf v0.1.1
[INFO] [stderr]    Compiling string v0.2.1
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling crossbeam-deque v0.7.1
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling mio-extras v2.0.5
[INFO] [stderr]    Compiling rand v0.7.0
[INFO] [stderr]    Compiling tower-limit v0.1.0
[INFO] [stderr]    Compiling tower-timeout v0.1.1
[INFO] [stderr]    Compiling tower-load v0.1.0 (https://github.com/tower-rs/tower.git#793e2e8e)
[INFO] [stderr]    Compiling tower-retry v0.1.0
[INFO] [stderr]    Compiling tokio-codec v0.1.1
[INFO] [stderr]    Compiling tower-util v0.1.0
[INFO] [stderr]    Compiling bufstream v0.1.4
[INFO] [stderr]    Compiling rayon-core v1.6.0
[INFO] [stderr]    Compiling tokio-threadpool v0.1.15
[INFO] [stderr]    Compiling crossbeam v0.7.2
[INFO] [stderr]    Compiling parking_lot v0.7.1
[INFO] [stderr]    Compiling regex-automata v0.1.8
[INFO] [stderr]    Compiling regex v1.3.1
[INFO] [stderr]    Compiling tokio-reactor v0.1.9
[INFO] [stderr]    Compiling tokio-fs v0.1.6
[INFO] [stderr]    Compiling rayon v1.2.0
[INFO] [stderr]    Compiling twox-hash v1.5.0
[INFO] [stderr]    Compiling matchers v0.0.1
[INFO] [stderr]    Compiling http-body v0.1.0
[INFO] [stderr]    Compiling h2 v0.1.26
[INFO] [stderr]    Compiling tokio-udp v0.1.5
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling tokio-uds v0.2.5
[INFO] [stderr]    Compiling tokio-signal v0.2.7
[INFO] [stderr]    Compiling zookeeper_derive v0.4.0
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling zookeeper v0.5.7
[INFO] [stderr]    Compiling cc v1.0.41
[INFO] [stderr]    Compiling hyper v0.12.33
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling tracing-attributes v0.1.2
[INFO] [stderr]    Compiling serde_derive v1.0.99
[INFO] [stderr]    Compiling tracing v0.1.8
[INFO] [stderr]    Compiling tower-buffer v0.1.1
[INFO] [stderr]    Compiling tower-balance v0.1.0 (https://github.com/tower-rs/tower.git#793e2e8e)
[INFO] [stderr]    Compiling tokio-tower v0.1.1 (https://github.com/tower-rs/tokio-tower.git?rev=2e1d40903b9a294d8c984612400838dcdc8fd758#2e1d4090)
[INFO] [stderr]    Compiling tower v0.1.1
[INFO] [stderr]    Compiling backtrace v0.3.35
[INFO] [stderr]    Compiling chrono v0.4.9
[INFO] [stderr]    Compiling serde_json v1.0.40
[INFO] [stderr]    Compiling petgraph v0.4.13
[INFO] [stderr]    Compiling nom-sql v0.0.9
[INFO] [stderr]    Compiling arccstr v1.2.3
[INFO] [stderr]    Compiling vec_map v0.8.1
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/arccstr-1.2.3/src/lib.rs:60:1
[INFO] [stderr]    |
[INFO] [stderr] 60 | #![feature(try_from)]
[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 `arccstr`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "65e5108bfe8410ffed1cd5d8a33a0f0c4b191573407771e67cb7f7fec87309d2"`
[INFO] running `"docker" "rm" "-f" "65e5108bfe8410ffed1cd5d8a33a0f0c4b191573407771e67cb7f7fec87309d2"`
[INFO] [stdout] 65e5108bfe8410ffed1cd5d8a33a0f0c4b191573407771e67cb7f7fec87309d2