[INFO] crate todo-txt 1.3.0 is already in cache
[INFO] checking todo-txt-1.3.0 against master#b61e69433951e31f7bd746e22f516a48ad41623b for prs-64470-and-65389
[INFO] extracting crate todo-txt 1.3.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate todo-txt 1.3.0 on toolchain b61e69433951e31f7bd746e22f516a48ad41623b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate todo-txt 1.3.0
[INFO] removed 1 missing examples
[INFO] finished tweaking crates.io crate todo-txt 1.3.0
[INFO] tweaked toml for crates.io crate todo-txt 1.3.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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" "+b61e69433951e31f7bd746e22f516a48ad41623b" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 64300a500227dce010f5a6359f3008015c6b240c3b99310d40ed3388471969be
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "64300a500227dce010f5a6359f3008015c6b240c3b99310d40ed3388471969be"`
[INFO] [stderr]     Checking todo-txt v1.3.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0277]: the trait bound `todo_txt::task::simple::Simple: serde::ser::Serialize` is not satisfied
[INFO] [stderr]     --> examples/serialization.rs:8:38
[INFO] [stderr]      |
[INFO] [stderr] 8    |     let json = serde_json::to_string(&task);
[INFO] [stderr]      |                                      ^^^^^ the trait `serde::ser::Serialize` is not implemented for `todo_txt::task::simple::Simple`
[INFO] [stderr]      | 
[INFO] [stderr]     ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_json-1.0.41/src/ser.rs:2224:8
[INFO] [stderr]      |
[INFO] [stderr] 2224 |     T: Serialize,
[INFO] [stderr]      |        --------- required by this bound in `serde_json::ser::to_string`
[INFO] [stderr]      |
[INFO] [stderr]      = note: required because of the requirements on the impl of `serde::ser::Serialize` for `std::result::Result<todo_txt::task::simple::Simple, ()>`
[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 `todo-txt`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "64300a500227dce010f5a6359f3008015c6b240c3b99310d40ed3388471969be"`
[INFO] running `"docker" "rm" "-f" "64300a500227dce010f5a6359f3008015c6b240c3b99310d40ed3388471969be"`
[INFO] [stdout] 64300a500227dce010f5a6359f3008015c6b240c3b99310d40ed3388471969be