[INFO] updating cached repository Lymia/sylph-verifier
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Lymia/sylph-verifier
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Lymia/sylph-verifier" "work/ex/beta-1.38-1/sources/1.37.0/gh/Lymia/sylph-verifier"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Lymia/sylph-verifier'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Lymia/sylph-verifier" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Lymia/sylph-verifier"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Lymia/sylph-verifier'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 67001b418d1b69bd02251dfa6da101b065c29454
[INFO] sha for GitHub repo Lymia/sylph-verifier: 67001b418d1b69bd02251dfa6da101b065c29454
[INFO] validating manifest of Lymia/sylph-verifier 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 Lymia/sylph-verifier 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 Lymia/sylph-verifier
[INFO] finished frobbing Lymia/sylph-verifier
[INFO] frobbed toml for Lymia/sylph-verifier written to work/ex/beta-1.38-1/sources/1.37.0/gh/Lymia/sylph-verifier/Cargo.toml
[INFO] started frobbing Lymia/sylph-verifier
[INFO] finished frobbing Lymia/sylph-verifier
[INFO] frobbed toml for Lymia/sylph-verifier written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Lymia/sylph-verifier/Cargo.toml
[INFO] crate Lymia/sylph-verifier 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing Lymia/sylph-verifier 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/Lymia/sylph-verifier:/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] 5a202d94ff49c5b8528ffd17c77186d2673e7ae74cf024cd4819a17455203428
[INFO] running `"docker" "start" "-a" "5a202d94ff49c5b8528ffd17c77186d2673e7ae74cf024cd4819a17455203428"`
[INFO] [stderr]    Compiling num-traits v0.2.4
[INFO] [stderr]    Compiling serde v1.0.61
[INFO] [stderr]    Compiling num-integer v0.1.38
[INFO] [stderr]    Compiling enumset v0.3.10
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling net2 v0.2.32
[INFO] [stderr]    Compiling memchr v1.0.2
[INFO] [stderr]    Compiling time v0.1.40
[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/enumset-0.3.10/src/lib.rs:2:39
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![cfg_attr(all(feature = "nightly"), feature(allow_internal_unstable, macro_vis_matcher))]
[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 `enumset`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "5a202d94ff49c5b8528ffd17c77186d2673e7ae74cf024cd4819a17455203428"`
[INFO] running `"docker" "rm" "-f" "5a202d94ff49c5b8528ffd17c77186d2673e7ae74cf024cd4819a17455203428"`
[INFO] [stdout] 5a202d94ff49c5b8528ffd17c77186d2673e7ae74cf024cd4819a17455203428