[INFO] crate nonblock 0.1.0 is already in cache
[INFO] testing nonblock-0.1.0 against 1.38.0 for beta-1.39-1
[INFO] extracting crate nonblock 0.1.0 into work/builds/worker-3/source
[INFO] validating manifest of crates.io crate nonblock 0.1.0 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate nonblock 0.1.0
[INFO] finished tweaking crates.io crate nonblock 0.1.0
[INFO] tweaked toml for crates.io crate nonblock 0.1.0 written to work/builds/worker-3/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] dab2b1e8a06a9043bd74ffbd3b161933e92bf31181fe299d2887d4e55fe032a8
[INFO] running `"docker" "start" "-a" "dab2b1e8a06a9043bd74ffbd3b161933e92bf31181fe299d2887d4e55fe032a8"`
[INFO] [stderr]    Compiling nonblock v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `"docker" "inspect" "dab2b1e8a06a9043bd74ffbd3b161933e92bf31181fe299d2887d4e55fe032a8"`
[INFO] running `"docker" "rm" "-f" "dab2b1e8a06a9043bd74ffbd3b161933e92bf31181fe299d2887d4e55fe032a8"`
[INFO] [stdout] dab2b1e8a06a9043bd74ffbd3b161933e92bf31181fe299d2887d4e55fe032a8
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 8f5ca4429108e7de0d66e1924426fe0ee2dd65dcbf67769d75796dd37110eac7
[INFO] running `"docker" "start" "-a" "8f5ca4429108e7de0d66e1924426fe0ee2dd65dcbf67769d75796dd37110eac7"`
[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/rustwide/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" "8f5ca4429108e7de0d66e1924426fe0ee2dd65dcbf67769d75796dd37110eac7"`
[INFO] running `"docker" "rm" "-f" "8f5ca4429108e7de0d66e1924426fe0ee2dd65dcbf67769d75796dd37110eac7"`
[INFO] [stdout] 8f5ca4429108e7de0d66e1924426fe0ee2dd65dcbf67769d75796dd37110eac7