[INFO] crate alligator 0.1.0 is already in cache
[INFO] extracting crate alligator 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/alligator/0.1.0
[INFO] extracting crate alligator 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/alligator/0.1.0
[INFO] validating manifest of alligator-0.1.0 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 alligator-0.1.0 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 alligator-0.1.0
[INFO] finished frobbing alligator-0.1.0
[INFO] frobbed toml for alligator-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/alligator/0.1.0/Cargo.toml
[INFO] started frobbing alligator-0.1.0
[INFO] finished frobbing alligator-0.1.0
[INFO] frobbed toml for alligator-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/alligator/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 alligator-0.1.0 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/reg/alligator/0.1.0:/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] 086af3c85ea665cd9406342c640eb281c6124807192dce2e2d9a40f3bd71e2ad
[INFO] running `"docker" "start" "-a" "086af3c85ea665cd9406342c640eb281c6124807192dce2e2d9a40f3bd71e2ad"`
[INFO] [stderr]    Compiling alligator v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved imports `std::task::Wake`, `std::task::LocalWaker`
[INFO] [stderr]   --> src/lib.rs:66:17
[INFO] [stderr]    |
[INFO] [stderr] 66 | use std::task::{Wake, Poll, LocalWaker};
[INFO] [stderr]    |                 ^^^^        ^^^^^^^^^^ no `LocalWaker` in `task`
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 no `Wake` in `task`
[INFO] [stderr]    |                 help: a similar name exists in the module: `Waker`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find function `local_waker_from_nonlocal` in module `std::task`
[INFO] [stderr]   --> src/lib.rs:83:22
[INFO] [stderr]    |
[INFO] [stderr] 83 |         ::std::task::local_waker_from_nonlocal(self.clone())
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^ not found in `std::task`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(futures_api)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(pin)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(async_await)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(await_macro)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(arbitrary_self_types)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 7 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `alligator`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "086af3c85ea665cd9406342c640eb281c6124807192dce2e2d9a40f3bd71e2ad"`
[INFO] running `"docker" "rm" "-f" "086af3c85ea665cd9406342c640eb281c6124807192dce2e2d9a40f3bd71e2ad"`
[INFO] [stdout] 086af3c85ea665cd9406342c640eb281c6124807192dce2e2d9a40f3bd71e2ad