[INFO] fetching crate tang-rs 0.1.0...
[INFO] checking tang-rs-0.1.0 against try#96b3c169cd2d8959926fa240f10342f1659f8ae3 for pr-71896
[INFO] extracting crate tang-rs 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate tang-rs 0.1.0 on toolchain 96b3c169cd2d8959926fa240f10342f1659f8ae3
[INFO] running `"/workspace/cargo-home/bin/cargo" "+96b3c169cd2d8959926fa240f10342f1659f8ae3" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate tang-rs 0.1.0
[INFO] finished tweaking crates.io crate tang-rs 0.1.0
[INFO] tweaked toml for crates.io crate tang-rs 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+96b3c169cd2d8959926fa240f10342f1659f8ae3" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+96b3c169cd2d8959926fa240f10342f1659f8ae3" "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" "+96b3c169cd2d8959926fa240f10342f1659f8ae3" "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] 4af30b6cd07c6924693443372c11635e0544344793eced4a928d2d9dfe6045db
[INFO] running `"docker" "start" "-a" "4af30b6cd07c6924693443372c11635e0544344793eced4a928d2d9dfe6045db"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling syn v1.0.19
[INFO] [stderr]     Checking futures-core v0.3.4
[INFO] [stderr]     Checking pin-project-lite v0.1.5
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]     Checking tokio v0.2.20
[INFO] [stderr]     Checking tang-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]   --> src/util/linked_list.rs:68:13
[INFO] [stderr]    |
[INFO] [stderr] 68 |             std::mem::replace(&mut (*prev).next_in_queue, next);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]   --> src/util/linked_list.rs:74:17
[INFO] [stderr]    |
[INFO] [stderr] 74 |                 std::mem::replace(&mut (*self.head).prev_in_queue, prev);
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]   --> src/util/linked_list.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 |             std::mem::replace(&mut (*next).prev_in_queue, prev);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]   --> src/util/linked_list.rs:68:13
[INFO] [stderr]    |
[INFO] [stderr] 68 |             std::mem::replace(&mut (*prev).next_in_queue, next);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]   --> src/util/linked_list.rs:74:17
[INFO] [stderr]    |
[INFO] [stderr] 74 |                 std::mem::replace(&mut (*self.head).prev_in_queue, prev);
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]   --> src/util/linked_list.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 |             std::mem::replace(&mut (*next).prev_in_queue, prev);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.01s
[INFO] running `"docker" "inspect" "4af30b6cd07c6924693443372c11635e0544344793eced4a928d2d9dfe6045db"`
[INFO] running `"docker" "rm" "-f" "4af30b6cd07c6924693443372c11635e0544344793eced4a928d2d9dfe6045db"`
[INFO] [stdout] 4af30b6cd07c6924693443372c11635e0544344793eced4a928d2d9dfe6045db