[INFO] crate rudp 0.2.1 is already in cache
[INFO] extracting crate rudp 0.2.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/rudp/0.2.1
[INFO] extracting crate rudp 0.2.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/rudp/0.2.1
[INFO] validating manifest of rudp-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 rudp-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 rudp-0.2.1
[INFO] finished frobbing rudp-0.2.1
[INFO] frobbed toml for rudp-0.2.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/rudp/0.2.1/Cargo.toml
[INFO] started frobbing rudp-0.2.1
[INFO] finished frobbing rudp-0.2.1
[INFO] frobbed toml for rudp-0.2.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/rudp/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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing rudp-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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/rudp/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] 2908ff4775d2e2c185e5ce7f84971f5381dd02f2c5412fb9c404781c07d5c8a8
[INFO] running `"docker" "start" "-a" "2908ff4775d2e2c185e5ce7f84971f5381dd02f2c5412fb9c404781c07d5c8a8"`
[INFO] [stderr]    Compiling rudp v0.2.1 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/helper.rs:42:28
[INFO] [stderr]    |
[INFO] [stderr] 42 |     pub resend_predicate: Box<FnMut(u32, Duration) -> bool>,
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(u32, Duration) -> bool`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `"docker" "inspect" "2908ff4775d2e2c185e5ce7f84971f5381dd02f2c5412fb9c404781c07d5c8a8"`
[INFO] running `"docker" "rm" "-f" "2908ff4775d2e2c185e5ce7f84971f5381dd02f2c5412fb9c404781c07d5c8a8"`
[INFO] [stdout] 2908ff4775d2e2c185e5ce7f84971f5381dd02f2c5412fb9c404781c07d5c8a8
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/rudp/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 9d88f3f508269b54f3997b527c06e2d988facb9aad335670352224720b9e7482
[INFO] running `"docker" "start" "-a" "9d88f3f508269b54f3997b527c06e2d988facb9aad335670352224720b9e7482"`
[INFO] [stderr]    Compiling bincode v1.1.4
[INFO] [stderr]    Compiling rudp v0.2.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `rand`
[INFO] [stderr]   --> src/tests.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | use rand::{thread_rng, Rng};
[INFO] [stderr]    |     ^^^^ maybe a missing `extern crate rand;`?
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/helper.rs:42:28
[INFO] [stderr]    |
[INFO] [stderr] 42 |     pub resend_predicate: Box<FnMut(u32, Duration) -> bool>,
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(u32, Duration) -> bool`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `rudp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9d88f3f508269b54f3997b527c06e2d988facb9aad335670352224720b9e7482"`
[INFO] running `"docker" "rm" "-f" "9d88f3f508269b54f3997b527c06e2d988facb9aad335670352224720b9e7482"`
[INFO] [stdout] 9d88f3f508269b54f3997b527c06e2d988facb9aad335670352224720b9e7482