[INFO] crate futures-util 0.2.1 is already in cache
[INFO] extracting crate futures-util 0.2.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/futures-util/0.2.1
[INFO] extracting crate futures-util 0.2.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/futures-util/0.2.1
[INFO] validating manifest of futures-util-0.2.1 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 futures-util-0.2.1 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 futures-util-0.2.1
[INFO] finished frobbing futures-util-0.2.1
[INFO] frobbed toml for futures-util-0.2.1 written to work/ex/beta-1.37-6/sources/1.36.0/reg/futures-util/0.2.1/Cargo.toml
[INFO] started frobbing futures-util-0.2.1
[INFO] finished frobbing futures-util-0.2.1
[INFO] frobbed toml for futures-util-0.2.1 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/futures-util/0.2.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing futures-util-0.2.1 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-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/futures-util/0.2.1:/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] a09dc634fb431212206890a8ac21c63c9e0451a9e4ac97a0b7943b027b589ba7
[INFO] running `"docker" "start" "-a" "a09dc634fb431212206890a8ac21c63c9e0451a9e4ac97a0b7943b027b589ba7"`
[INFO] [stderr]    Compiling futures-core v0.2.1
[INFO] [stderr]    Compiling futures-channel v0.2.1
[INFO] [stderr]    Compiling futures-io v0.2.1
[INFO] [stderr]    Compiling futures-sink v0.2.1
[INFO] [stderr]    Compiling futures-util v0.2.1 (/opt/crater/workdir)
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]    --> src/future/shared.rs:306:20
[INFO] [stderr]     |
[INFO] [stderr] 306 |         self.error.cause()
[INFO] [stderr]     |                    ^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]    --> src/lib.rs:5:54
[INFO] [stderr]     |
[INFO] [stderr] 5   | #![deny(missing_docs, missing_debug_implementations, warnings)]
[INFO] [stderr]     |                                                      ^^^^^^^^
[INFO] [stderr]     = note: #[warn(deprecated)] implied by #[warn(warnings)]
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.23s
[INFO] running `"docker" "inspect" "a09dc634fb431212206890a8ac21c63c9e0451a9e4ac97a0b7943b027b589ba7"`
[INFO] running `"docker" "rm" "-f" "a09dc634fb431212206890a8ac21c63c9e0451a9e4ac97a0b7943b027b589ba7"`
[INFO] [stdout] a09dc634fb431212206890a8ac21c63c9e0451a9e4ac97a0b7943b027b589ba7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/futures-util/0.2.1:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] fde122890d8358d34f751c8e994a98790ea740b3ffc6898631d9a836f1a9c89b
[INFO] running `"docker" "start" "-a" "fde122890d8358d34f751c8e994a98790ea740b3ffc6898631d9a836f1a9c89b"`
[INFO] [stderr]    Compiling futures-util v0.2.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0463]: can't find crate for `futures_executor`
[INFO] [stderr]   --> src/lib.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | extern crate futures_executor;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr] error: Could not compile `futures-util`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "fde122890d8358d34f751c8e994a98790ea740b3ffc6898631d9a836f1a9c89b"`
[INFO] running `"docker" "rm" "-f" "fde122890d8358d34f751c8e994a98790ea740b3ffc6898631d9a836f1a9c89b"`
[INFO] [stdout] fde122890d8358d34f751c8e994a98790ea740b3ffc6898631d9a836f1a9c89b