[INFO] crate futures-timer 0.2.1 is already in cache
[INFO] extracting crate futures-timer 0.2.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/futures-timer/0.2.1
[INFO] extracting crate futures-timer 0.2.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/futures-timer/0.2.1
[INFO] validating manifest of futures-timer-0.2.1 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 futures-timer-0.2.1 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 futures-timer-0.2.1
[INFO] finished frobbing futures-timer-0.2.1
[INFO] frobbed toml for futures-timer-0.2.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/futures-timer/0.2.1/Cargo.toml
[INFO] started frobbing futures-timer-0.2.1
[INFO] finished frobbing futures-timer-0.2.1
[INFO] frobbed toml for futures-timer-0.2.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/futures-timer/0.2.1/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing futures-timer-0.2.1 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/futures-timer/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 6ca8b88a58cba2e8b4ecec64a51dda0d239d204baa1d303efe972a01bdf17f31
[INFO] running `"docker" "start" "-a" "6ca8b88a58cba2e8b4ecec64a51dda0d239d204baa1d303efe972a01bdf17f31"`
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-timer v0.2.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0277]: the trait bound `ext::TimeoutStream<S>: futures_core::stream::Stream` is not satisfied
[INFO] [stderr]    --> src/ext.rs:170:9
[INFO] [stderr]     |
[INFO] [stderr] 170 | impl<S> TryStream for TimeoutStream<S>
[INFO] [stderr]     |         ^^^^^^^^^ the trait `futures_core::stream::Stream` is not implemented for `ext::TimeoutStream<S>`
[INFO] [stderr]     |
[INFO] [stderr]     = note: required because of the requirements on the impl of `futures_core::stream::private_try_stream::Sealed` for `ext::TimeoutStream<S>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `futures-timer`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "6ca8b88a58cba2e8b4ecec64a51dda0d239d204baa1d303efe972a01bdf17f31"`
[INFO] running `"docker" "rm" "-f" "6ca8b88a58cba2e8b4ecec64a51dda0d239d204baa1d303efe972a01bdf17f31"`
[INFO] [stdout] 6ca8b88a58cba2e8b4ecec64a51dda0d239d204baa1d303efe972a01bdf17f31