[INFO] fetching crate jsonfmt 0.4.1...
[INFO] checking jsonfmt-0.4.1 against master#39b841dfe36f90a7cd111e7f0c55f32594f6e578 for pr-77035
[INFO] extracting crate jsonfmt 0.4.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate jsonfmt 0.4.1 on toolchain 39b841dfe36f90a7cd111e7f0c55f32594f6e578
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate jsonfmt 0.4.1
[INFO] finished tweaking crates.io crate jsonfmt 0.4.1
[INFO] tweaked toml for crates.io crate jsonfmt 0.4.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate jsonfmt 0.4.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c5fc01bb6a82837da6a898a1dd6812e8bb19cee0e2361ff1906456658db13de8
[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" "c5fc01bb6a82837da6a898a1dd6812e8bb19cee0e2361ff1906456658db13de8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c5fc01bb6a82837da6a898a1dd6812e8bb19cee0e2361ff1906456658db13de8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5fc01bb6a82837da6a898a1dd6812e8bb19cee0e2361ff1906456658db13de8", kill_on_drop: false }`
[INFO] [stdout] c5fc01bb6a82837da6a898a1dd6812e8bb19cee0e2361ff1906456658db13de8
[INFO] running `Command { std: "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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+39b841dfe36f90a7cd111e7f0c55f32594f6e578" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 39535de7d1acf1981c0916c318de1cb0f8ac3634d491f230209bb68cf5088b16
[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" "39535de7d1acf1981c0916c318de1cb0f8ac3634d491f230209bb68cf5088b16", kill_on_drop: false }`
[INFO] [stderr]     Checking pico-args v0.3.0
[INFO] [stderr]    Compiling indexmap v1.3.0
[INFO] [stderr]     Checking serde_json v1.0.41
[INFO] [stderr]     Checking jsonfmt v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0453]: allow(dead_code) incompatible with previous forbid
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0453`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `jsonfmt`
[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[E0453]: allow(unreachable_code) incompatible with previous forbid
[INFO] [stdout]   --> src/main.rs:37:22
[INFO] [stdout]    |
[INFO] [stdout] 1  | #![forbid(warnings)]
[INFO] [stdout]    |           -------- `forbid` level set here
[INFO] [stdout] ...
[INFO] [stdout] 37 |         output_file: args.opt_value_from_str("-o")?,
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ overruled by previous forbid
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0453]: allow(unreachable_code) incompatible with previous forbid
[INFO] [stdout]   --> src/main.rs:39:15
[INFO] [stdout]    |
[INFO] [stdout] 1  | #![forbid(warnings)]
[INFO] [stdout]    |           -------- `forbid` level set here
[INFO] [stdout] ...
[INFO] [stdout] 39 |         free: args.free()?,
[INFO] [stdout]    |               ^^^^^^^^^^^^ overruled by previous forbid
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0453`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "39535de7d1acf1981c0916c318de1cb0f8ac3634d491f230209bb68cf5088b16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39535de7d1acf1981c0916c318de1cb0f8ac3634d491f230209bb68cf5088b16", kill_on_drop: false }`
[INFO] [stdout] 39535de7d1acf1981c0916c318de1cb0f8ac3634d491f230209bb68cf5088b16