[INFO] fetching crate cluConstConcat 1.2.2...
[INFO] checking cluConstConcat-1.2.2 against try#6024cfef3a82f9a7688f07054f1650081bad3af5 for pr-74130
[INFO] extracting crate cluConstConcat 1.2.2 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate cluConstConcat 1.2.2 on toolchain 6024cfef3a82f9a7688f07054f1650081bad3af5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cluConstConcat 1.2.2
[INFO] finished tweaking crates.io crate cluConstConcat 1.2.2
[INFO] tweaked toml for crates.io crate cluConstConcat 1.2.2 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d205ee191a51af9064a65f6c80e1c773283a2be3d14d24baac808ecaaf404ce2
[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" "d205ee191a51af9064a65f6c80e1c773283a2be3d14d24baac808ecaaf404ce2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d205ee191a51af9064a65f6c80e1c773283a2be3d14d24baac808ecaaf404ce2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d205ee191a51af9064a65f6c80e1c773283a2be3d14d24baac808ecaaf404ce2", kill_on_drop: false }`
[INFO] [stdout] d205ee191a51af9064a65f6c80e1c773283a2be3d14d24baac808ecaaf404ce2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 79e34f7e7ad019b6c982f0bd45adde40b3d2d46d4d03b6e2eb580698ee4e3121
[INFO] running `Command { std: "docker" "start" "-a" "79e34f7e7ad019b6c982f0bd45adde40b3d2d46d4d03b6e2eb580698ee4e3121", kill_on_drop: false }`
[INFO] [stderr]     Checking cluConstConcat v1.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unknown lint: `unions_with_drop_fields`
[INFO] [stdout]    --> src/lib.rs:193:9
[INFO] [stdout]     |
[INFO] [stdout] 193 | #[allow(unions_with_drop_fields)]
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unknown_lints)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0740]: unions may not contain fields that need dropping
[INFO] [stdout]    --> src/lib.rs:195:2
[INFO] [stdout]     |
[INFO] [stdout] 195 |     value: Value,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `std::mem::ManuallyDrop` can be used to wrap the type
[INFO] [stdout]    --> src/lib.rs:195:2
[INFO] [stdout]     |
[INFO] [stdout] 195 |     value: Value,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unknown lint: `unions_with_drop_fields`
[INFO] [stdout]    --> src/lib.rs:193:9
[INFO] [stdout]     |
[INFO] [stdout] 193 | #[allow(unions_with_drop_fields)]
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unknown_lints)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0740`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cluConstConcat`.
[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] [stdout] error[E0740]: unions may not contain fields that need dropping
[INFO] [stdout]    --> src/lib.rs:195:2
[INFO] [stdout]     |
[INFO] [stdout] 195 |     value: Value,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: `std::mem::ManuallyDrop` can be used to wrap the type
[INFO] [stdout]    --> src/lib.rs:195:2
[INFO] [stdout]     |
[INFO] [stdout] 195 |     value: Value,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0740`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "79e34f7e7ad019b6c982f0bd45adde40b3d2d46d4d03b6e2eb580698ee4e3121", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79e34f7e7ad019b6c982f0bd45adde40b3d2d46d4d03b6e2eb580698ee4e3121", kill_on_drop: false }`
[INFO] [stdout] 79e34f7e7ad019b6c982f0bd45adde40b3d2d46d4d03b6e2eb580698ee4e3121