[INFO] fetching crate pallet-contracts-rpc 0.8.0-alpha.6...
[INFO] checking pallet-contracts-rpc-0.8.0-alpha.6 against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] extracting crate pallet-contracts-rpc 0.8.0-alpha.6 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate pallet-contracts-rpc 0.8.0-alpha.6 on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate pallet-contracts-rpc 0.8.0-alpha.6
[INFO] finished tweaking crates.io crate pallet-contracts-rpc 0.8.0-alpha.6
[INFO] tweaked toml for crates.io crate pallet-contracts-rpc 0.8.0-alpha.6 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2450fe9fa2bbf01a484cd2715b5bcd6fb1cf2b35f892941209ecba2d8edc2f51
[INFO] running `"docker" "start" "-a" "2450fe9fa2bbf01a484cd2715b5bcd6fb1cf2b35f892941209ecba2d8edc2f51"`
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[INFO] [stderr]     Checking pallet-contracts-rpc v0.8.0-alpha.6 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `serde_json`
[INFO] [stderr]    --> src/lib.rs:287:37
[INFO] [stderr]     |
[INFO] [stderr] 287 |             let res: RpcContractExecResult = serde_json::from_str(expected).unwrap();
[INFO] [stderr]     |                                              ^^^^^^^^^^ use of undeclared type or module `serde_json`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `serde_json`
[INFO] [stderr]    --> src/lib.rs:288:17
[INFO] [stderr]     |
[INFO] [stderr] 288 |             let actual = serde_json::to_string(&res).unwrap();
[INFO] [stderr]     |                          ^^^^^^^^^^ use of undeclared type or module `serde_json`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: could not compile `pallet-contracts-rpc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "2450fe9fa2bbf01a484cd2715b5bcd6fb1cf2b35f892941209ecba2d8edc2f51"`
[INFO] running `"docker" "rm" "-f" "2450fe9fa2bbf01a484cd2715b5bcd6fb1cf2b35f892941209ecba2d8edc2f51"`
[INFO] [stdout] 2450fe9fa2bbf01a484cd2715b5bcd6fb1cf2b35f892941209ecba2d8edc2f51