[INFO] crate nonblock 0.1.0 is already in cache
[INFO] extracting crate nonblock 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/nonblock/0.1.0
[INFO] extracting crate nonblock 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/nonblock/0.1.0
[INFO] validating manifest of nonblock-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 nonblock-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 nonblock-0.1.0
[INFO] finished frobbing nonblock-0.1.0
[INFO] frobbed toml for nonblock-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/nonblock/0.1.0/Cargo.toml
[INFO] started frobbing nonblock-0.1.0
[INFO] finished frobbing nonblock-0.1.0
[INFO] frobbed toml for nonblock-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/nonblock/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 nonblock-0.1.0 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-1/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/nonblock/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 07f99430a4a2263467a98f61013b9bb5b02398526e3966d421cfb49150b0d9d4
[INFO] running `"docker" "start" "-a" "07f99430a4a2263467a98f61013b9bb5b02398526e3966d421cfb49150b0d9d4"`
[INFO] [stderr]    Compiling nonblock v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `"docker" "inspect" "07f99430a4a2263467a98f61013b9bb5b02398526e3966d421cfb49150b0d9d4"`
[INFO] running `"docker" "rm" "-f" "07f99430a4a2263467a98f61013b9bb5b02398526e3966d421cfb49150b0d9d4"`
[INFO] [stdout] 07f99430a4a2263467a98f61013b9bb5b02398526e3966d421cfb49150b0d9d4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/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/nonblock/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 123ca6937541214ffa9a67639cb3a5f1326cbc0cb9099e9ebacc1f1b468fe75b
[INFO] running `"docker" "start" "-a" "123ca6937541214ffa9a67639cb3a5f1326cbc0cb9099e9ebacc1f1b468fe75b"`
[INFO] [stderr]    Compiling serde v0.7.15
[INFO] [stderr]    Compiling chrono v0.2.25
[INFO] [stderr]    Compiling serde_json v0.7.4
[INFO] [stderr]    Compiling nonblock v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0277]: the trait bound `chrono::DateTime<chrono::UTC>: serde::ser::Serialize` is not satisfied
[INFO] [stderr]   --> examples/structure-stdio.rs:49:30
[INFO] [stderr]    |
[INFO] [stderr] 49 |                             .insert("time", time);
[INFO] [stderr]    |                              ^^^^^^ the trait `serde::ser::Serialize` is not implemented for `chrono::DateTime<chrono::UTC>`
[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 `nonblock`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "123ca6937541214ffa9a67639cb3a5f1326cbc0cb9099e9ebacc1f1b468fe75b"`
[INFO] running `"docker" "rm" "-f" "123ca6937541214ffa9a67639cb3a5f1326cbc0cb9099e9ebacc1f1b468fe75b"`
[INFO] [stdout] 123ca6937541214ffa9a67639cb3a5f1326cbc0cb9099e9ebacc1f1b468fe75b