[INFO] fetching crate lain_derive 0.4.1...
[INFO] checking lain_derive-0.4.1 against try#4662032ab74cd44d423120d08d251dfead4914a0 for pr-72788
[INFO] extracting crate lain_derive 0.4.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate lain_derive 0.4.1 on toolchain 4662032ab74cd44d423120d08d251dfead4914a0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+4662032ab74cd44d423120d08d251dfead4914a0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate lain_derive 0.4.1
[INFO] finished tweaking crates.io crate lain_derive 0.4.1
[INFO] tweaked toml for crates.io crate lain_derive 0.4.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+4662032ab74cd44d423120d08d251dfead4914a0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+4662032ab74cd44d423120d08d251dfead4914a0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[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" "+4662032ab74cd44d423120d08d251dfead4914a0" "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] 85eb2757acad9d5c6f97d6d9d7c8886a9e2557b0ffd469f732223f36f9f2dbd0
[INFO] running `"docker" "start" "-a" "85eb2757acad9d5c6f97d6d9d7c8886a9e2557b0ffd469f732223f36f9f2dbd0"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling proc-macro-hack-impl v0.4.2
[INFO] [stderr]     Checking unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]     Checking proc-macro2 v0.4.30
[INFO] [stderr]    Compiling proc-macro-hack v0.4.2
[INFO] [stderr]    Compiling mashup-impl v0.1.9
[INFO] [stderr]     Checking quote v0.6.13
[INFO] [stderr]     Checking mashup v0.1.9
[INFO] [stderr]     Checking lain_derive v0.4.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `field_max_items`
[INFO] [stderr]    --> src/mutations.rs:550:9
[INFO] [stderr]     |
[INFO] [stderr] 550 |     let field_max_items = field.attrs.min().unwrap_or(&zero_tokens);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_field_max_items`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `field_max_items`
[INFO] [stderr]    --> src/mutations.rs:550:9
[INFO] [stderr]     |
[INFO] [stderr] 550 |     let field_max_items = field.attrs.min().unwrap_or(&zero_tokens);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_field_max_items`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.79s
[INFO] running `"docker" "inspect" "85eb2757acad9d5c6f97d6d9d7c8886a9e2557b0ffd469f732223f36f9f2dbd0"`
[INFO] running `"docker" "rm" "-f" "85eb2757acad9d5c6f97d6d9d7c8886a9e2557b0ffd469f732223f36f9f2dbd0"`
[INFO] [stdout] 85eb2757acad9d5c6f97d6d9d7c8886a9e2557b0ffd469f732223f36f9f2dbd0