[INFO] crate pallet-transaction-payment-rpc-runtime-api 2.0.0-alpha.6 is already in cache
[INFO] checking pallet-transaction-payment-rpc-runtime-api-2.0.0-alpha.6 against try#d93021f5faa26e4f9d2719e79f9974e06aa40e17 for pr-71873
[INFO] extracting crate pallet-transaction-payment-rpc-runtime-api 2.0.0-alpha.6 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate pallet-transaction-payment-rpc-runtime-api 2.0.0-alpha.6 on toolchain d93021f5faa26e4f9d2719e79f9974e06aa40e17
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d93021f5faa26e4f9d2719e79f9974e06aa40e17" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate pallet-transaction-payment-rpc-runtime-api 2.0.0-alpha.6
[INFO] finished tweaking crates.io crate pallet-transaction-payment-rpc-runtime-api 2.0.0-alpha.6
[INFO] tweaked toml for crates.io crate pallet-transaction-payment-rpc-runtime-api 2.0.0-alpha.6 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d93021f5faa26e4f9d2719e79f9974e06aa40e17" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d93021f5faa26e4f9d2719e79f9974e06aa40e17" "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-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+d93021f5faa26e4f9d2719e79f9974e06aa40e17" "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] 45ea61c5b615f7c7a4c016a14e45d2b3fe20195e575bf99a4875cab5192c573e
[INFO] running `"docker" "start" "-a" "45ea61c5b615f7c7a4c016a14e45d2b3fe20195e575bf99a4875cab5192c573e"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling unicode-xid v0.2.0
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[INFO] [stderr]     Checking pallet-transaction-payment-rpc-runtime-api v2.0.0-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:80:14
[INFO] [stderr]    |
[INFO] [stderr] 80 |         assert_eq!(serde_json::to_string(&info).unwrap(), json_str);
[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:81:14
[INFO] [stderr]    |
[INFO] [stderr] 81 |         assert_eq!(serde_json::from_str::<RuntimeDispatchInfo<u64>>(json_str).unwrap(), info);
[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:84:3
[INFO] [stderr]    |
[INFO] [stderr] 84 |         serde_json::to_value(&info).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:97:14
[INFO] [stderr]    |
[INFO] [stderr] 97 |         assert_eq!(serde_json::to_string(&info).unwrap(), json_str);
[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:98:14
[INFO] [stderr]    |
[INFO] [stderr] 98 |         assert_eq!(serde_json::from_str::<RuntimeDispatchInfo<u128>>(json_str).unwrap(), info);
[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:101:3
[INFO] [stderr]     |
[INFO] [stderr] 101 |         serde_json::to_value(&info).unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^ use of undeclared type or module `serde_json`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 6 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: could not compile `pallet-transaction-payment-rpc-runtime-api`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "45ea61c5b615f7c7a4c016a14e45d2b3fe20195e575bf99a4875cab5192c573e"`
[INFO] running `"docker" "rm" "-f" "45ea61c5b615f7c7a4c016a14e45d2b3fe20195e575bf99a4875cab5192c573e"`
[INFO] [stdout] 45ea61c5b615f7c7a4c016a14e45d2b3fe20195e575bf99a4875cab5192c573e