[INFO] crate carrier 0.9.10 is already in cache
[INFO] extracting crate carrier 0.9.10 into work/ex/beta-1.38-1/sources/1.37.0/reg/carrier/0.9.10
[INFO] extracting crate carrier 0.9.10 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/carrier/0.9.10
[INFO] validating manifest of carrier-0.9.10 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 carrier-0.9.10 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 carrier-0.9.10
[INFO] finished frobbing carrier-0.9.10
[INFO] frobbed toml for carrier-0.9.10 written to work/ex/beta-1.38-1/sources/1.37.0/reg/carrier/0.9.10/Cargo.toml
[INFO] started frobbing carrier-0.9.10
[INFO] finished frobbing carrier-0.9.10
[INFO] frobbed toml for carrier-0.9.10 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/carrier/0.9.10/Cargo.toml
[INFO] crate carrier-0.9.10 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing carrier-0.9.10 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/carrier/0.9.10:/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] 934fa3bde8e5dbd792694b8df073c4c3f0241c134cb10fb512195674e1a014a1
[INFO] running `"docker" "start" "-a" "934fa3bde8e5dbd792694b8df073c4c3f0241c134cb10fb512195674e1a014a1"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling cc v1.0.28
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling rustc-demangle v0.1.13
[INFO] [stderr]    Compiling cfg-if v0.1.6
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling subtle v2.0.0
[INFO] [stderr]    Compiling unicode-segmentation v1.2.1
[INFO] [stderr]    Compiling remove_dir_all v0.5.1
[INFO] [stderr]    Compiling nix v0.11.0
[INFO] [stderr]    Compiling serde v1.0.90
[INFO] [stderr]    Compiling nix v0.13.0
[INFO] [stderr]    Compiling bitflags v1.0.4
[INFO] [stderr]    Compiling static_slice v0.0.3
[INFO] [stderr]    Compiling mtdparts v0.2.0
[INFO] [stderr]    Compiling gcmap v0.1.4
[INFO] [stderr]    Compiling crc8 v0.1.1
[INFO] [stderr]    Compiling bs58 v0.2.2
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling rand_jitter v0.1.2
[INFO] [stderr]    Compiling block-padding v0.1.3
[INFO] [stderr]    Compiling itertools v0.8.0
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling rand_pcg v0.1.1
[INFO] [stderr]    Compiling snow v0.5.2
[INFO] [stderr]    Compiling generic-array v0.12.0
[INFO] [stderr]    Compiling smallvec v0.6.8
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling tinylogger v0.1.0
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling rand_os v0.1.2
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling wait-timeout v0.2.0
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling num_cpus v1.10.0
[INFO] [stderr]    Compiling digest v0.8.0
[INFO] [stderr]    Compiling block-buffer v0.7.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling clear_on_drop v0.2.3
[INFO] [stderr]    Compiling hacl-star-sys v0.0.7
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling hpack v0.3.0
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]    Compiling mio v0.6.16
[INFO] [stderr]    Compiling pbr v1.0.1
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling mio-extras v2.0.5
[INFO] [stderr]    Compiling hacl-star v0.0.14
[INFO] [stderr]    Compiling tempfile v3.0.7
[INFO] [stderr]    Compiling curve25519-dalek v1.0.3
[INFO] [stderr]    Compiling toml v0.5.0
[INFO] [stderr]    Compiling x25519-dalek v0.5.2
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling osaka-macros v0.2.10
[INFO] [stderr]    Compiling serde_derive v1.0.90
[INFO] [stderr]    Compiling osaka v0.2.10
[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/osaka-0.2.10/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(generators, generator_trait)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/osaka-0.2.10/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(custom_attribute)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/osaka-0.2.10/src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(termination_trait_lib)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `osaka`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "934fa3bde8e5dbd792694b8df073c4c3f0241c134cb10fb512195674e1a014a1"`
[INFO] running `"docker" "rm" "-f" "934fa3bde8e5dbd792694b8df073c4c3f0241c134cb10fb512195674e1a014a1"`
[INFO] [stdout] 934fa3bde8e5dbd792694b8df073c4c3f0241c134cb10fb512195674e1a014a1