[INFO] updating cached repository pandaman64/hello-eff
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/pandaman64/hello-eff
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/pandaman64/hello-eff" "work/ex/beta-1.38-1/sources/1.37.0/gh/pandaman64/hello-eff"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/pandaman64/hello-eff'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/pandaman64/hello-eff" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pandaman64/hello-eff"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pandaman64/hello-eff'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] eca39862f35c1c74d43b60ed5b59b06e9f3a4ad4
[INFO] sha for GitHub repo pandaman64/hello-eff: eca39862f35c1c74d43b60ed5b59b06e9f3a4ad4
[INFO] validating manifest of pandaman64/hello-eff 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 pandaman64/hello-eff 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 pandaman64/hello-eff
[INFO] finished frobbing pandaman64/hello-eff
[INFO] frobbed toml for pandaman64/hello-eff written to work/ex/beta-1.38-1/sources/1.37.0/gh/pandaman64/hello-eff/Cargo.toml
[INFO] started frobbing pandaman64/hello-eff
[INFO] finished frobbing pandaman64/hello-eff
[INFO] frobbed toml for pandaman64/hello-eff written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pandaman64/hello-eff/Cargo.toml
[INFO] crate pandaman64/hello-eff 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 pandaman64/hello-eff 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/pandaman64/hello-eff:/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] b4c96e5bff4ab6ed9b07b801aecd46568b9a68fb7dfccf2173b52160932526da
[INFO] running `"docker" "start" "-a" "b4c96e5bff4ab6ed9b07b801aecd46568b9a68fb7dfccf2173b52160932526da"`
[INFO] [stderr]    Compiling eff v0.1.0 (https://github.com/pandaman64/effective-rust.git#98128601)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/effective-rust-55ebb878becc3487/9812860/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(nll, generators, generator_trait, unsized_locals)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/effective-rust-55ebb878becc3487/9812860/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(trace_macros)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `resume` found for type `std::boxed::Box<(dyn std::ops::Generator<Yield = E, Return = T> + 'static)>` in the current scope
[INFO] [stderr]    --> /opt/crater/cargo-home/git/checkouts/effective-rust-55ebb878becc3487/9812860/src/lib.rs:169:41
[INFO] [stderr]     |
[INFO] [stderr] 169 |         let state = unsafe { expr.inner.resume() };
[INFO] [stderr]     |                                         ^^^^^^
[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 `eff`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b4c96e5bff4ab6ed9b07b801aecd46568b9a68fb7dfccf2173b52160932526da"`
[INFO] running `"docker" "rm" "-f" "b4c96e5bff4ab6ed9b07b801aecd46568b9a68fb7dfccf2173b52160932526da"`
[INFO] [stdout] b4c96e5bff4ab6ed9b07b801aecd46568b9a68fb7dfccf2173b52160932526da