[INFO] crate cp_api 0.3.1 is already in cache
[INFO] testing cp_api-0.3.1 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate cp_api 0.3.1 into work/builds/worker-7/source
[INFO] validating manifest of crates.io crate cp_api 0.3.1 on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate cp_api 0.3.1
[INFO] finished tweaking crates.io crate cp_api 0.3.1
[INFO] tweaked toml for crates.io crate cp_api 0.3.1 written to work/builds/worker-7/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/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" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] aad09fb25ab27ddd56733e2f23181e11b6fe27cd4fe7bec8c15ffb78d785466e
[INFO] running `"docker" "start" "-a" "aad09fb25ab27ddd56733e2f23181e11b6fe27cd4fe7bec8c15ffb78d785466e"`
[INFO] [stderr]    Compiling cp_api v0.3.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0252]: the name `Serialize` is defined multiple times
[INFO] [stderr]   --> src/client.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use serde::Serialize;
[INFO] [stderr]    |     ---------------- previous import of the macro `Serialize` here
[INFO] [stderr] 11 | use serde_derive::Serialize;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^ `Serialize` reimported here
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Serialize` must be defined only once in the macro namespace of this module
[INFO] [stderr] 
[INFO] [stderr] error[E0252]: the name `Serialize` is defined multiple times
[INFO] [stderr]  --> src/response.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use serde::Serialize;
[INFO] [stderr]   |     ---------------- previous import of the macro `Serialize` here
[INFO] [stderr] 7 | use serde_derive::Serialize;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^ `Serialize` reimported here
[INFO] [stderr]   |
[INFO] [stderr]   = note: `Serialize` must be defined only once in the macro namespace of this module
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `serde_derive::Serialize`
[INFO] [stderr]   --> src/client.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use serde_derive::Serialize;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `serde_derive::Serialize`
[INFO] [stderr]  --> src/response.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use serde_derive::Serialize;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0252`.
[INFO] [stderr] error: could not compile `cp_api`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "aad09fb25ab27ddd56733e2f23181e11b6fe27cd4fe7bec8c15ffb78d785466e"`
[INFO] running `"docker" "rm" "-f" "aad09fb25ab27ddd56733e2f23181e11b6fe27cd4fe7bec8c15ffb78d785466e"`
[INFO] [stdout] aad09fb25ab27ddd56733e2f23181e11b6fe27cd4fe7bec8c15ffb78d785466e