[INFO] updating cached repository aep/cr2
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/aep/cr2
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/aep/cr2" "work/ex/beta-1.38-1/sources/1.37.0/gh/aep/cr2"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/aep/cr2'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/aep/cr2" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aep/cr2"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aep/cr2'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2dab7fa669b242f8cf2d7b2715e6d0df3f40b65a
[INFO] sha for GitHub repo aep/cr2: 2dab7fa669b242f8cf2d7b2715e6d0df3f40b65a
[INFO] validating manifest of aep/cr2 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 aep/cr2 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 aep/cr2
[INFO] finished frobbing aep/cr2
[INFO] frobbed toml for aep/cr2 written to work/ex/beta-1.38-1/sources/1.37.0/gh/aep/cr2/Cargo.toml
[INFO] started frobbing aep/cr2
[INFO] finished frobbing aep/cr2
[INFO] frobbed toml for aep/cr2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aep/cr2/Cargo.toml
[INFO] crate aep/cr2 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] testing aep/cr2 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/aep/cr2:/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] 45d6562badeaf47361c0652076ed1f9df48a2d90d9a6317348c3f1ce8a1f1200
[INFO] running `"docker" "start" "-a" "45d6562badeaf47361c0652076ed1f9df48a2d90d9a6317348c3f1ce8a1f1200"`
[INFO] [stderr]    Compiling byte-tools v0.3.0
[INFO] [stderr]    Compiling subtle v2.0.0
[INFO] [stderr]    Compiling pest v0.3.3
[INFO] [stderr]    Compiling multimap v0.4.0
[INFO] [stderr]    Compiling nix v0.13.0
[INFO] [stderr]    Compiling opaque-debug v0.2.1
[INFO] [stderr]    Compiling crc8 v0.1.1
[INFO] [stderr]    Compiling bs58 v0.2.2
[INFO] [stderr]    Compiling mtdparts v0.2.0
[INFO] [stderr]    Compiling clear_on_drop v0.2.3
[INFO] [stderr]    Compiling hacl-star-sys v0.0.6
[INFO] [stderr]    Compiling rand v0.6.4
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling itertools v0.7.11
[INFO] [stderr]    Compiling rand_core v0.2.2
[INFO] [stderr]    Compiling petgraph v0.4.13
[INFO] [stderr]    Compiling block-padding v0.1.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling rand v0.4.5
[INFO] [stderr]    Compiling nix v0.9.0
[INFO] [stderr]    Compiling dirs v1.0.4
[INFO] [stderr]    Compiling wait-timeout v0.2.0
[INFO] [stderr]    Compiling snow v0.4.2
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stderr]    Compiling mio v0.6.16
[INFO] [stderr]    Compiling tinylogger v0.1.0
[INFO] [stderr]    Compiling digest v0.8.0
[INFO] [stderr]    Compiling block-buffer v0.7.0
[INFO] [stderr]    Compiling osaka-macros v0.2.2
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling prost v0.4.0
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling hpack v0.3.0
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling hacl-star v0.0.11
[INFO] [stderr]    Compiling mio-extras v2.0.5
[INFO] [stderr]    Compiling osaka v0.2.5
[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/osaka-0.2.5/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-0.2.5/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(custom_attribute)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `resume` found for type `&mut X` in the current scope
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/osaka-0.2.5/src/lib.rs:123:29
[INFO] [stderr]     |
[INFO] [stderr] 123 |         match unsafe { self.resume() } {
[INFO] [stderr]     |                             ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `resume`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `std::ops::Generator`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an 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" "45d6562badeaf47361c0652076ed1f9df48a2d90d9a6317348c3f1ce8a1f1200"`
[INFO] running `"docker" "rm" "-f" "45d6562badeaf47361c0652076ed1f9df48a2d90d9a6317348c3f1ce8a1f1200"`
[INFO] [stdout] 45d6562badeaf47361c0652076ed1f9df48a2d90d9a6317348c3f1ce8a1f1200