[INFO] crate coroutine 0.8.0 is already in cache
[INFO] extracting crate coroutine 0.8.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/coroutine/0.8.0
[INFO] extracting crate coroutine 0.8.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/coroutine/0.8.0
[INFO] validating manifest of coroutine-0.8.0 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 coroutine-0.8.0 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 coroutine-0.8.0
[INFO] finished frobbing coroutine-0.8.0
[INFO] frobbed toml for coroutine-0.8.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/coroutine/0.8.0/Cargo.toml
[INFO] started frobbing coroutine-0.8.0
[INFO] finished frobbing coroutine-0.8.0
[INFO] frobbed toml for coroutine-0.8.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/coroutine/0.8.0/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 coroutine-0.8.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/coroutine/0.8.0:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 8aa6b6cec98b35454100fe22eaf9b277a825d2e7f8c9af16ea520eef7b9cb929
[INFO] running `"docker" "start" "-a" "8aa6b6cec98b35454100fe22eaf9b277a825d2e7f8c9af16ea520eef7b9cb929"`
[INFO] [stderr]    Compiling context v1.0.1
[INFO] [stderr]    Compiling coroutine v0.8.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::boxed::FnBox`
[INFO] [stderr]   --> src/asymmetric.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 | use std::boxed::FnBox;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^ no `FnBox` in `boxed`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | #![feature(fnbox)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/asymmetric.rs:41:22
[INFO] [stderr]    |
[INFO] [stderr] 41 | type Thunk<'a> = Box<FnBox(&mut Coroutine, usize) -> usize + 'a>;
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnBox(&mut Coroutine, usize) -> usize + 'a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/asymmetric.rs:175:32
[INFO] [stderr]     |
[INFO] [stderr] 175 |     panicked_error: Option<Box<Any + Send + 'static>>,
[INFO] [stderr]     |                                ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Any + Send + 'static`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:53:19
[INFO] [stderr]    |
[INFO] [stderr] 53 |     Panicking(Box<Any + Send>),
[INFO] [stderr]    |                   ^^^^^^^^^^ help: use `dyn`: `dyn Any + Send`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `coroutine`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "8aa6b6cec98b35454100fe22eaf9b277a825d2e7f8c9af16ea520eef7b9cb929"`
[INFO] running `"docker" "rm" "-f" "8aa6b6cec98b35454100fe22eaf9b277a825d2e7f8c9af16ea520eef7b9cb929"`
[INFO] [stdout] 8aa6b6cec98b35454100fe22eaf9b277a825d2e7f8c9af16ea520eef7b9cb929