[INFO] updating cached repository 6br/phase
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/6br/phase
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/6br/phase" "work/ex/beta-1.37-6/sources/1.36.0/gh/6br/phase"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/6br/phase'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/6br/phase" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/6br/phase"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/6br/phase'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3ec9d273fe929d587dfeb1e60151ed96e066b812
[INFO] sha for GitHub repo 6br/phase: 3ec9d273fe929d587dfeb1e60151ed96e066b812
[INFO] validating manifest of 6br/phase 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 6br/phase 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 6br/phase
[INFO] finished frobbing 6br/phase
[INFO] frobbed toml for 6br/phase written to work/ex/beta-1.37-6/sources/1.36.0/gh/6br/phase/Cargo.toml
[INFO] started frobbing 6br/phase
[INFO] finished frobbing 6br/phase
[INFO] frobbed toml for 6br/phase written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/6br/phase/Cargo.toml
[INFO] crate 6br/phase 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing 6br/phase 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/6br/phase:/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] 4367dc6cbe7c32dd9b13a9f4c59872c2168b6c403ebbc45be736e2710eb941a9
[INFO] running `"docker" "start" "-a" "4367dc6cbe7c32dd9b13a9f4c59872c2168b6c403ebbc45be736e2710eb941a9"`
[INFO] [stderr]    Compiling bindgen v0.32.1
[INFO] [stderr]    Compiling ieee754 v0.2.2
[INFO] [stderr]    Compiling memchr v1.0.2
[INFO] [stderr]    Compiling which v1.0.3
[INFO] [stderr]    Compiling clang-sys v0.21.1
[INFO] [stderr]    Compiling fs-utils v1.0.0
[INFO] [stderr]    Compiling itertools v0.6.5
[INFO] [stderr]    Compiling clap v2.29.1
[INFO] [stderr]    Compiling newtype_derive v0.1.6
[INFO] [stderr]    Compiling regex v0.2.5
[INFO] [stderr]    Compiling nom v3.2.1
[INFO] [stderr]    Compiling num-rational v0.1.40
[INFO] [stderr]    Compiling num v0.1.41
[INFO] [stderr]    Compiling gcollections v0.3.5
[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/gcollections-0.3.5/src/libgcollections/lib.rs:16:1
[INFO] [stderr]    |
[INFO] [stderr] 16 | #![feature(specialization)]
[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 `gcollections`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4367dc6cbe7c32dd9b13a9f4c59872c2168b6c403ebbc45be736e2710eb941a9"`
[INFO] running `"docker" "rm" "-f" "4367dc6cbe7c32dd9b13a9f4c59872c2168b6c403ebbc45be736e2710eb941a9"`
[INFO] [stdout] 4367dc6cbe7c32dd9b13a9f4c59872c2168b6c403ebbc45be736e2710eb941a9