[INFO] updating cached repository ejmahler/unity_coroutines
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ejmahler/unity_coroutines
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ejmahler/unity_coroutines" "work/ex/beta-1.37-6/sources/1.36.0/gh/ejmahler/unity_coroutines"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/ejmahler/unity_coroutines'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ejmahler/unity_coroutines" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ejmahler/unity_coroutines"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ejmahler/unity_coroutines'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 54589ee4e451efe5645749719c10ecc4c4cac6f8
[INFO] sha for GitHub repo ejmahler/unity_coroutines: 54589ee4e451efe5645749719c10ecc4c4cac6f8
[INFO] validating manifest of ejmahler/unity_coroutines 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 ejmahler/unity_coroutines 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 ejmahler/unity_coroutines
[INFO] finished frobbing ejmahler/unity_coroutines
[INFO] frobbed toml for ejmahler/unity_coroutines written to work/ex/beta-1.37-6/sources/1.36.0/gh/ejmahler/unity_coroutines/Cargo.toml
[INFO] started frobbing ejmahler/unity_coroutines
[INFO] finished frobbing ejmahler/unity_coroutines
[INFO] frobbed toml for ejmahler/unity_coroutines written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ejmahler/unity_coroutines/Cargo.toml
[INFO] crate ejmahler/unity_coroutines 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] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing ejmahler/unity_coroutines 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-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/ejmahler/unity_coroutines:/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] d80ca9223d523be27e9007a59dd0fd5ae9c2da563aaf9898a315b8d49de1d697
[INFO] running `"docker" "start" "-a" "d80ca9223d523be27e9007a59dd0fd5ae9c2da563aaf9898a315b8d49de1d697"`
[INFO] [stderr]    Compiling unity_coroutines v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(generators, generator_trait)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `resume` found for type `std::boxed::Box<(dyn std::ops::Generator<Yield = coroutine::CoroutineCondition, Return = ()> + 'static)>` in the current scope
[INFO] [stderr]   --> src/coroutine.rs:62:45
[INFO] [stderr]    |
[INFO] [stderr] 62 |                 let resume_result = coroutine.generator.resume();
[INFO] [stderr]    |                                                         ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 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 `unity_coroutines`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d80ca9223d523be27e9007a59dd0fd5ae9c2da563aaf9898a315b8d49de1d697"`
[INFO] running `"docker" "rm" "-f" "d80ca9223d523be27e9007a59dd0fd5ae9c2da563aaf9898a315b8d49de1d697"`
[INFO] [stdout] d80ca9223d523be27e9007a59dd0fd5ae9c2da563aaf9898a315b8d49de1d697