[INFO] crate carrier 0.11.0 is already in cache
[INFO] testing carrier-0.11.0 against 1.38.0 for beta-1.39-1
[INFO] extracting crate carrier 0.11.0 into work/builds/worker-4/source
[INFO] validating manifest of crates.io crate carrier 0.11.0 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 crates.io crate carrier 0.11.0
[INFO] finished tweaking crates.io crate carrier 0.11.0
[INFO] tweaked toml for crates.io crate carrier 0.11.0 written to work/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate carrier 0.11.0 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] running `"docker" "create" "-v" "/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/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] 95ac3d74516f38cd535a34edebe9166e2f48c5d964efa5e121b068f556d23b9d
[INFO] running `"docker" "start" "-a" "95ac3d74516f38cd535a34edebe9166e2f48c5d964efa5e121b068f556d23b9d"`
[INFO] [stderr]    Compiling cc v1.0.28
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]    Compiling subtle v2.0.0
[INFO] [stderr]    Compiling nix v0.11.0
[INFO] [stderr]    Compiling nix v0.13.0
[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 backtrace v0.3.13
[INFO] [stderr]    Compiling itertools v0.8.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling rand_jitter v0.1.2
[INFO] [stderr]    Compiling block-padding v0.1.3
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling log v0.4.8
[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 dirs v1.0.5
[INFO] [stderr]    Compiling num_cpus v1.10.0
[INFO] [stderr]    Compiling wait-timeout v0.2.0
[INFO] [stderr]    Compiling rand_pcg v0.1.1
[INFO] [stderr]    Compiling snow v0.5.2
[INFO] [stderr]    Compiling smallvec v0.6.8
[INFO] [stderr]    Compiling toml v0.5.0
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling env_logger v0.6.2
[INFO] [stderr]    Compiling tinylogger v0.1.0
[INFO] [stderr]    Compiling mio v0.6.16
[INFO] [stderr]    Compiling pbr v1.0.1
[INFO] [stderr]    Compiling hpack v0.3.0
[INFO] [stderr]    Compiling bytes v0.4.12
[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 sha2 v0.8.0
[INFO] [stderr]    Compiling mio-extras v2.0.5
[INFO] [stderr]    Compiling tempfile v3.0.7
[INFO] [stderr]    Compiling curve25519-dalek v1.0.3
[INFO] [stderr]    Compiling hacl-star v0.0.14
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling x25519-dalek v0.5.2
[INFO] [stderr]    Compiling failure_derive v0.1.5
[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]    Compiling failure v0.1.5
[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/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/rustwide/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/rustwide/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" "95ac3d74516f38cd535a34edebe9166e2f48c5d964efa5e121b068f556d23b9d"`
[INFO] running `"docker" "rm" "-f" "95ac3d74516f38cd535a34edebe9166e2f48c5d964efa5e121b068f556d23b9d"`
[INFO] [stdout] 95ac3d74516f38cd535a34edebe9166e2f48c5d964efa5e121b068f556d23b9d