[INFO] updating cached repository https://github.com/christiansakai/serde_playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 53975e8d10ec884fe91b2ab3d9d43c4a9354dec7
[INFO] testing christiansakai/serde_playground against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchristiansakai%2Fserde_playground" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/christiansakai/serde_playground on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/christiansakai/serde_playground
[INFO] finished tweaking git repo https://github.com/christiansakai/serde_playground
[INFO] tweaked toml for git repo https://github.com/christiansakai/serde_playground written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/christiansakai/serde_playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b8b41a064a49c7ed4c6aacc9c07cdb58e070b4f446ed5e8ed7ee3a10ef9cfbb7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b8b41a064a49c7ed4c6aacc9c07cdb58e070b4f446ed5e8ed7ee3a10ef9cfbb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b8b41a064a49c7ed4c6aacc9c07cdb58e070b4f446ed5e8ed7ee3a10ef9cfbb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8b41a064a49c7ed4c6aacc9c07cdb58e070b4f446ed5e8ed7ee3a10ef9cfbb7", kill_on_drop: false }`
[INFO] [stdout] b8b41a064a49c7ed4c6aacc9c07cdb58e070b4f446ed5e8ed7ee3a10ef9cfbb7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6be2e411b9ea8a114642182da4465a86415282789f5ac3454404a4009b948294
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6be2e411b9ea8a114642182da4465a86415282789f5ac3454404a4009b948294", kill_on_drop: false }`
[INFO] [stderr]    Compiling getrandom v0.1.11
[INFO] [stderr]    Compiling cc v1.0.41
[INFO] [stderr]    Compiling ord_subset v3.1.1
[INFO] [stderr]    Compiling md5 v0.6.1
[INFO] [stderr]    Compiling chrono v0.4.7
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling decimal v2.0.4
[INFO] [stderr]    Compiling rand v0.7.0
[INFO] [stderr]    Compiling serde_derive v1.0.99
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]    Compiling serde_json v1.0.40
[INFO] [stderr]    Compiling ron v0.5.1
[INFO] [stderr]    Compiling bson v0.13.1
[INFO] [stderr]    Compiling serde_experiment v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:1:13
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use(bson, doc)]
[INFO] [stdout]   |             ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use(bson, doc)]
[INFO] [stdout]   |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `bson::Bson` is not an iterator
[INFO] [stdout]   --> src/main.rs:31:38
[INFO] [stdout]    |
[INFO] [stdout] 31 |     bson::encode_document(&mut file, serialized);
[INFO] [stdout]    |                                      ^^^^^^^^^^ `bson::Bson` is not an iterator
[INFO] [stdout]    | 
[INFO] [stdout]   ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/bson-0.13.1/src/encoder/mod.rs:92:70
[INFO] [stdout]    |
[INFO] [stdout] 92 | pub fn encode_document<'a, S: AsRef<str> + 'a, W: Write + ?Sized, D: IntoIterator<Item = (&'a S, &'a Bson)>>(
[INFO] [stdout]    |                                                                      -------------------------------------- required by this bound in `bson::encode_document`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `std::iter::Iterator` is not implemented for `bson::Bson`
[INFO] [stdout]    = note: required because of the requirements on the impl of `std::iter::IntoIterator` for `bson::Bson`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:37:29
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let b = bson::from_bson(&serialized).unwrap();
[INFO] [stdout]    |                             ^^^^^^^^^^^ expected enum `bson::Bson`, found `&std::string::String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0308.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde_experiment`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "6be2e411b9ea8a114642182da4465a86415282789f5ac3454404a4009b948294", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6be2e411b9ea8a114642182da4465a86415282789f5ac3454404a4009b948294", kill_on_drop: false }`
[INFO] [stdout] 6be2e411b9ea8a114642182da4465a86415282789f5ac3454404a4009b948294