[INFO] crate remain 0.1.3 is already in cache
[INFO] extracting crate remain 0.1.3 into work/ex/beta-1.37-6/sources/1.36.0/reg/remain/0.1.3
[INFO] extracting crate remain 0.1.3 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/remain/0.1.3
[INFO] validating manifest of remain-0.1.3 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 remain-0.1.3 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 remain-0.1.3
[INFO] finished frobbing remain-0.1.3
[INFO] frobbed toml for remain-0.1.3 written to work/ex/beta-1.37-6/sources/1.36.0/reg/remain/0.1.3/Cargo.toml
[INFO] started frobbing remain-0.1.3
[INFO] finished frobbing remain-0.1.3
[INFO] frobbed toml for remain-0.1.3 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/remain/0.1.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 remain-0.1.3 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/remain/0.1.3:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] df50c5e9ae657072a754f1e438ac0452743eea132418e1face25f51524e7392f
[INFO] running `"docker" "start" "-a" "df50c5e9ae657072a754f1e438ac0452743eea132418e1face25f51524e7392f"`
[INFO] [stderr]    Compiling syn v0.15.42
[INFO] [stderr]    Compiling remain v0.1.3 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 21.59s
[INFO] running `"docker" "inspect" "df50c5e9ae657072a754f1e438ac0452743eea132418e1face25f51524e7392f"`
[INFO] running `"docker" "rm" "-f" "df50c5e9ae657072a754f1e438ac0452743eea132418e1face25f51524e7392f"`
[INFO] [stdout] df50c5e9ae657072a754f1e438ac0452743eea132418e1face25f51524e7392f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/remain/0.1.3:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 4bdef50f87508c526a5e79b9a6fa57446cccc498ba562821aace7e9ffddd9fd8
[INFO] running `"docker" "start" "-a" "4bdef50f87508c526a5e79b9a6fa57446cccc498ba562821aace7e9ffddd9fd8"`
[INFO] [stderr]    Compiling serde_derive v1.0.98
[INFO] [stderr]    Compiling select-rustc v0.1.2
[INFO] [stderr]    Compiling serde v1.0.98
[INFO] [stderr]    Compiling serde_json v1.0.40
[INFO] [stderr]    Compiling toml v0.5.1
[INFO] [stderr]    Compiling trybuild v1.0.10
[INFO] [stderr]    Compiling remain v0.1.3 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> tests/unstable.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(proc_macro_hygiene, stmt_expr_attributes)]
[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 `remain`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4bdef50f87508c526a5e79b9a6fa57446cccc498ba562821aace7e9ffddd9fd8"`
[INFO] running `"docker" "rm" "-f" "4bdef50f87508c526a5e79b9a6fa57446cccc498ba562821aace7e9ffddd9fd8"`
[INFO] [stdout] 4bdef50f87508c526a5e79b9a6fa57446cccc498ba562821aace7e9ffddd9fd8