[INFO] crate sp-rpc 2.0.0-alpha.5 is already in cache
[INFO] checking sp-rpc-2.0.0-alpha.5 against master#bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc for pr-70917
[INFO] extracting crate sp-rpc 2.0.0-alpha.5 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate sp-rpc 2.0.0-alpha.5 on toolchain bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate sp-rpc 2.0.0-alpha.5
[INFO] finished tweaking crates.io crate sp-rpc 2.0.0-alpha.5
[INFO] tweaked toml for crates.io crate sp-rpc 2.0.0-alpha.5 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "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] a443dee0d41ca7b9cf4dc0d8bd558d8218552372d3e7e8a888b4a5a6fff8c24a
[INFO] running `"docker" "start" "-a" "a443dee0d41ca7b9cf4dc0d8bd558d8218552372d3e7e8a888b4a5a6fff8c24a"`
[INFO] [stderr]     Checking libsecp256k1 v0.3.5
[INFO] [stderr]     Checking parity-scale-codec v1.3.0
[INFO] [stderr]     Checking impl-codec v0.4.2
[INFO] [stderr]     Checking sp-wasm-interface v2.0.0-alpha.5
[INFO] [stderr]     Checking primitive-types v0.7.0
[INFO] [stderr]     Checking parity-util-mem v0.6.0
[INFO] [stderr]     Checking sp-runtime-interface v2.0.0-alpha.5
[INFO] [stderr]     Checking sp-core v2.0.0-alpha.5
[INFO] [stderr]     Checking sp-rpc v2.0.0-alpha.5 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `serde_json`
[INFO] [stderr]   --> src/lib.rs:30:3
[INFO] [stderr]    |
[INFO] [stderr] 30 |         serde_json::from_str::<T>(s).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:34:3
[INFO] [stderr]    |
[INFO] [stderr] 34 |         serde_json::to_string(&expected).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 `sp-rpc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a443dee0d41ca7b9cf4dc0d8bd558d8218552372d3e7e8a888b4a5a6fff8c24a"`
[INFO] running `"docker" "rm" "-f" "a443dee0d41ca7b9cf4dc0d8bd558d8218552372d3e7e8a888b4a5a6fff8c24a"`
[INFO] [stdout] a443dee0d41ca7b9cf4dc0d8bd558d8218552372d3e7e8a888b4a5a6fff8c24a