[INFO] fetching crate skiplist 0.3.0... [INFO] testing skiplist-0.3.0 against beta-2020-10-09 for beta-1.48-1 [INFO] extracting crate skiplist 0.3.0 into /workspace/builds/worker-5/source [INFO] validating manifest of crates.io crate skiplist 0.3.0 on toolchain beta-2020-10-09 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] started tweaking crates.io crate skiplist 0.3.0 [INFO] finished tweaking crates.io crate skiplist 0.3.0 [INFO] tweaked toml for crates.io crate skiplist 0.3.0 written to /workspace/builds/worker-5/source/Cargo.toml [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }` [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 03345734c724c84639760a6ad169477e413a1400c41ba8b87741804d9b15366b [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" "03345734c724c84639760a6ad169477e413a1400c41ba8b87741804d9b15366b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "03345734c724c84639760a6ad169477e413a1400c41ba8b87741804d9b15366b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "03345734c724c84639760a6ad169477e413a1400c41ba8b87741804d9b15366b", kill_on_drop: false }` [INFO] [stdout] 03345734c724c84639760a6ad169477e413a1400c41ba8b87741804d9b15366b [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] d379998b5a1e340e6b2510de3f05493e5694c2dac99c7bb1449c24de2dbb3a32 [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" "d379998b5a1e340e6b2510de3f05493e5694c2dac99c7bb1449c24de2dbb3a32", kill_on_drop: false }` [INFO] [stderr] Compiling rand_pcg v0.2.1 [INFO] [stderr] Compiling rand v0.7.3 [INFO] [stderr] Compiling skiplist v0.3.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:249:17 [INFO] [stdout] | [INFO] [stdout] 249 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:254:9 [INFO] [stdout] | [INFO] [stdout] 254 | mem::replace(&mut self.head, new_head); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:882:21 [INFO] [stdout] | [INFO] [stdout] 882 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:961:21 [INFO] [stdout] | [INFO] [stdout] 961 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:1397:17 [INFO] [stdout] | [INFO] [stdout] 1397 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:95:17 [INFO] [stdout] | [INFO] [stdout] 95 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:100:9 [INFO] [stdout] | [INFO] [stdout] 100 | mem::replace(&mut self.head, new_head); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:583:21 [INFO] [stdout] | [INFO] [stdout] 583 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:886:21 [INFO] [stdout] | [INFO] [stdout] 886 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:1120:17 [INFO] [stdout] | [INFO] [stdout] 1120 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skipmap.rs:309:17 [INFO] [stdout] | [INFO] [stdout] 309 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skipmap.rs:314:9 [INFO] [stdout] | [INFO] [stdout] 314 | mem::replace(&mut self.head, new_head); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skipmap.rs:1293:17 [INFO] [stdout] | [INFO] [stdout] 1293 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 4.02s [INFO] [stdout] warning: 13 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "d379998b5a1e340e6b2510de3f05493e5694c2dac99c7bb1449c24de2dbb3a32", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d379998b5a1e340e6b2510de3f05493e5694c2dac99c7bb1449c24de2dbb3a32", kill_on_drop: false }` [INFO] [stdout] d379998b5a1e340e6b2510de3f05493e5694c2dac99c7bb1449c24de2dbb3a32 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] e3546609ba8f434c02d309973563d6eb4f5c5a11e77a242f2190743b540104fa [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" "e3546609ba8f434c02d309973563d6eb4f5c5a11e77a242f2190743b540104fa", kill_on_drop: false }` [INFO] [stderr] Compiling regex-syntax v0.6.20 [INFO] [stderr] Compiling regex-automata v0.1.9 [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:249:17 [INFO] [stdout] | [INFO] [stdout] 249 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:254:9 [INFO] [stdout] | [INFO] [stdout] 254 | mem::replace(&mut self.head, new_head); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:882:21 [INFO] [stdout] | [INFO] [stdout] 882 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:961:21 [INFO] [stdout] | [INFO] [stdout] 961 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:1397:17 [INFO] [stdout] | [INFO] [stdout] 1397 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:95:17 [INFO] [stdout] | [INFO] [stdout] 95 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:100:9 [INFO] [stdout] | [INFO] [stdout] 100 | mem::replace(&mut self.head, new_head); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:583:21 [INFO] [stdout] | [INFO] [stdout] 583 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:886:21 [INFO] [stdout] | [INFO] [stdout] 886 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:1120:17 [INFO] [stdout] | [INFO] [stdout] 1120 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skipmap.rs:309:17 [INFO] [stdout] | [INFO] [stdout] 309 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skipmap.rs:314:9 [INFO] [stdout] | [INFO] [stdout] 314 | mem::replace(&mut self.head, new_head); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skipmap.rs:1293:17 [INFO] [stdout] | [INFO] [stdout] 1293 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 13 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Compiling bstr v0.2.13 [INFO] [stderr] Compiling csv v1.1.3 [INFO] [stderr] Compiling regex v1.4.1 [INFO] [stderr] Compiling criterion v0.3.3 [INFO] [stderr] Compiling skiplist v0.3.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:249:17 [INFO] [stdout] | [INFO] [stdout] 249 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:254:9 [INFO] [stdout] | [INFO] [stdout] 254 | mem::replace(&mut self.head, new_head); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:882:21 [INFO] [stdout] | [INFO] [stdout] 882 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:961:21 [INFO] [stdout] | [INFO] [stdout] 961 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/ordered_skiplist.rs:1397:17 [INFO] [stdout] | [INFO] [stdout] 1397 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:95:17 [INFO] [stdout] | [INFO] [stdout] 95 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:100:9 [INFO] [stdout] | [INFO] [stdout] 100 | mem::replace(&mut self.head, new_head); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:583:21 [INFO] [stdout] | [INFO] [stdout] 583 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:886:21 [INFO] [stdout] | [INFO] [stdout] 886 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skiplist.rs:1120:17 [INFO] [stdout] | [INFO] [stdout] 1120 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skipmap.rs:309:17 [INFO] [stdout] | [INFO] [stdout] 309 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skipmap.rs:314:9 [INFO] [stdout] | [INFO] [stdout] 314 | mem::replace(&mut self.head, new_head); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used [INFO] [stdout] --> src/skipmap.rs:1293:17 [INFO] [stdout] | [INFO] [stdout] 1293 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: if you don't need the old value, you can just assign the new value directly [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 13 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 18.72s [INFO] running `Command { std: "docker" "inspect" "e3546609ba8f434c02d309973563d6eb4f5c5a11e77a242f2190743b540104fa", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e3546609ba8f434c02d309973563d6eb4f5c5a11e77a242f2190743b540104fa", kill_on_drop: false }` [INFO] [stdout] e3546609ba8f434c02d309973563d6eb4f5c5a11e77a242f2190743b540104fa [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 5c2eb5e3f5b636b70445fcf49bf1f5ef1a4ea8c62835356f3152cbead5e4c784 [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" "5c2eb5e3f5b636b70445fcf49bf1f5ef1a4ea8c62835356f3152cbead5e4c784", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used [INFO] [stderr] --> src/ordered_skiplist.rs:249:17 [INFO] [stderr] | [INFO] [stderr] 249 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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/ordered_skiplist.rs:254:9 [INFO] [stderr] | [INFO] [stderr] 254 | mem::replace(&mut self.head, new_head); [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/ordered_skiplist.rs:882:21 [INFO] [stderr] | [INFO] [stderr] 882 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [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/ordered_skiplist.rs:961:21 [INFO] [stderr] | [INFO] [stderr] 961 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [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/ordered_skiplist.rs:1397:17 [INFO] [stderr] | [INFO] [stderr] 1397 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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/skiplist.rs:95:17 [INFO] [stderr] | [INFO] [stderr] 95 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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/skiplist.rs:100:9 [INFO] [stderr] | [INFO] [stderr] 100 | mem::replace(&mut self.head, new_head); [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/skiplist.rs:583:21 [INFO] [stderr] | [INFO] [stderr] 583 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [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/skiplist.rs:886:21 [INFO] [stderr] | [INFO] [stderr] 886 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [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/skiplist.rs:1120:17 [INFO] [stderr] | [INFO] [stderr] 1120 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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/skipmap.rs:309:17 [INFO] [stderr] | [INFO] [stderr] 309 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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/skipmap.rs:314:9 [INFO] [stderr] | [INFO] [stderr] 314 | mem::replace(&mut self.head, new_head); [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/skipmap.rs:1293:17 [INFO] [stderr] | [INFO] [stderr] 1293 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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: 13 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used [INFO] [stderr] --> src/ordered_skiplist.rs:249:17 [INFO] [stderr] | [INFO] [stderr] 249 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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/ordered_skiplist.rs:254:9 [INFO] [stderr] | [INFO] [stderr] 254 | mem::replace(&mut self.head, new_head); [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/ordered_skiplist.rs:882:21 [INFO] [stderr] | [INFO] [stderr] 882 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [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/ordered_skiplist.rs:961:21 [INFO] [stderr] | [INFO] [stderr] 961 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [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/ordered_skiplist.rs:1397:17 [INFO] [stderr] | [INFO] [stderr] 1397 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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/skiplist.rs:95:17 [INFO] [stderr] | [INFO] [stderr] 95 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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/skiplist.rs:100:9 [INFO] [stderr] | [INFO] [stderr] 100 | mem::replace(&mut self.head, new_head); [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/skiplist.rs:583:21 [INFO] [stderr] | [INFO] [stderr] 583 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [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/skiplist.rs:886:21 [INFO] [stderr] | [INFO] [stderr] 886 | mem::replace(&mut (*prev).next, mem::replace(&mut (*node).next, None)); [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/skiplist.rs:1120:17 [INFO] [stderr] | [INFO] [stderr] 1120 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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/skipmap.rs:309:17 [INFO] [stderr] | [INFO] [stderr] 309 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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/skipmap.rs:314:9 [INFO] [stderr] | [INFO] [stderr] 314 | mem::replace(&mut self.head, new_head); [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/skipmap.rs:1293:17 [INFO] [stderr] | [INFO] [stderr] 1293 | mem::replace(&mut (*node).next, mem::replace(&mut next.next, None)); [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: 13 warnings emitted [INFO] [stderr] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.49s [INFO] [stderr] Running /opt/rustwide/target/debug/deps/skiplist-fe8e7ee9ace66189 [INFO] [stdout] [INFO] [stdout] running 58 tests [INFO] [stdout] test ordered_skiplist::tests::basic_small ... ok [INFO] [stdout] test level_generator::tests::new ... ok [INFO] [stdout] test ordered_skiplist::tests::contains ... ok [INFO] [stdout] test ordered_skiplist::tests::debug_display ... ok [INFO] [stdout] test ordered_skiplist::tests::clear ... ok [INFO] [stdout] test ordered_skiplist::tests::range_small ... ok [INFO] [stdout] test ordered_skiplist::tests::equality ... ok [INFO] [stdout] test ordered_skiplist::tests::sort_by ... ok [INFO] [stdout] test ordered_skiplist::tests::remove ... ok [INFO] [stdout] test ordered_skiplist::tests::with_comp ... ok [INFO] [stdout] test ordered_skiplist::tests::remove_index ... ok [INFO] [stdout] test skiplist::tests::basic_small ... ok [INFO] [stdout] test ordered_skiplist::tests::range_1000 ... ok [INFO] [stdout] test skiplist::tests::contains ... ok [INFO] [stdout] test skiplist::tests::clear ... ok [INFO] [stdout] test skiplist::tests::debug_display ... ok [INFO] [stdout] test skiplist::tests::equality ... ok [INFO] [stdout] test ordered_skiplist::tests::index_pop ... ok [INFO] [stdout] test skiplist::tests::inplace_mut ... ok [INFO] [stdout] test ordered_skiplist::tests::range ... ok [INFO] [stdout] test ordered_skiplist::tests::pop ... ok [INFO] [stdout] test skiplist::tests::index_pop ... ok [INFO] [stdout] test level_generator::tests::invalid_total ... ok [INFO] [stdout] test level_generator::tests::invalid_p_0 ... ok [INFO] [stdout] test level_generator::tests::invalid_p_1 ... ok [INFO] [stdout] test skiplist::tests::range_1000 ... ok [INFO] [stdout] test ordered_skiplist::tests::sort_by_panic ... ok [INFO] [stdout] test skiplist::tests::range_small ... ok [INFO] [stdout] test skipmap::tests::basic_small ... ok [INFO] [stdout] test ordered_skiplist::tests::iter_rev ... ok [INFO] [stdout] test skipmap::tests::clear ... ok [INFO] [stdout] test ordered_skiplist::tests::iter ... ok [INFO] [stdout] test skipmap::tests::debug_display ... ok [INFO] [stdout] test skipmap::tests::contains ... ok [INFO] [stdout] test skipmap::tests::insert_existing ... ok [INFO] [stdout] test skipmap::tests::equality ... ok [INFO] [stdout] test ordered_skiplist::tests::basic_large ... ok [INFO] [stdout] test ordered_skiplist::tests::iter_mixed ... ok [INFO] [stdout] test skiplist::tests::range_mut_1000 ... ok [INFO] [stdout] test skipmap::tests::iter_mixed ... ok [INFO] [stdout] test skipmap::tests::iter_rev ... ok [INFO] [stdout] test skipmap::tests::range_small ... ok [INFO] [stdout] test ordered_skiplist::tests::retain ... ok [INFO] [stdout] test skipmap::tests::iter_key_val ... ok [INFO] [stdout] test skipmap::tests::range_1000 ... ok [INFO] [stdout] test skiplist::tests::iter ... ok [INFO] [stdout] test skipmap::tests::index_pop ... ok [INFO] [stdout] test skipmap::tests::iter ... ok [INFO] [stdout] test skiplist::tests::iter_rev ... ok [INFO] [stdout] test skiplist::tests::iter_mixed ... ok [INFO] [stdout] test skipmap::tests::remove_index ... ok [INFO] [stdout] test skiplist::tests::retain ... ok [INFO] [stdout] test skipmap::tests::basic_large ... ok [INFO] [stdout] test skipmap::tests::range ... ok [INFO] [stdout] test skiplist::tests::range ... ok [INFO] [stdout] test skiplist::tests::basic_large ... ok [INFO] [stdout] test ordered_skiplist::tests::dedup ... ok [INFO] [stdout] test skiplist::tests::dedup ... ok [INFO] [stderr] Doc-tests skiplist [INFO] [stdout] [INFO] [stdout] test result: ok. 58 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 69 tests [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::pop_front (line 456) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::get (line 432) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::clear (line 235) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::len (line 261) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::back (line 407) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::new (line 69) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::contains (line 506) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::is_empty (line 277) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::into_iter (line 971) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::range (line 1020) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::pop_back (line 481) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::remove (line 555) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::insert (line 295) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::front (line 383) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::dedup (line 893) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::iter (line 994) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::with_comp (line 146) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::remove_index (line 769) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::contains (line 791) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::retain (line 827) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::with_capacity (line 102) ... ok [INFO] [stdout] test src/ordered_skiplist.rs - ordered_skiplist::OrderedSkipList::remove_first (line 659) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::front_mut (line 291) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::back_mut (line 340) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::clear (line 81) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::dedup (line 816) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::back (line 315) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::front (line 267) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::insert (line 146) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::get (line 365) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::get_mut (line 389) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::into_iter (line 593) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::is_empty (line 123) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::new (line 38) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::pop_back (line 442) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::iter (line 616) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::iter_mut (line 638) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::len (line 107) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::range_mut (line 727) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::pop_front (line 417) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::push_back (line 250) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::push_front (line 235) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::retain (line 528) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::range (line 664) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::remove (line 471) ... ok [INFO] [stdout] test src/skiplist.rs - skiplist::SkipList::with_capacity (line 60) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::back (line 419) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::back_mut (line 453) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::clear (line 295) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::contains_key (line 628) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::front (line 356) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::get (line 484) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::is_empty (line 337) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::into_iter (line 838) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::new (line 137) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::get_mut (line 529) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::front_mut (line 389) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::insert (line 180) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::iter (line 861) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::len (line 321) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::iter_mut (line 886) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::pop_front (line 578) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::pop_back (line 603) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::keys (line 909) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::remove (line 674) ... FAILED [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::range (line 957) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::values (line 931) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::with_capacity (line 159) ... ok [INFO] [stdout] test src/skipmap.rs - skipmap::SkipMap::remove_index (line 784) ... ok [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] [INFO] [stdout] ---- src/skipmap.rs - skipmap::SkipMap::remove (line 674) stdout ---- [INFO] [stdout] Test executable failed (exit code 101). [INFO] [stdout] [INFO] [stdout] stderr: [INFO] [stdout] thread 'main' panicked at 'attempt to subtract with overflow', /opt/rustwide/workdir/src/skipmap.rs:753:25 [INFO] [stdout] stack backtrace: [INFO] [stdout] 0: 0x5584029b0010 - std::backtrace_rs::backtrace::libunwind::trace::h7cf3ca97bd83fbab [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96 [INFO] [stdout] 1: 0x5584029b0010 - std::backtrace_rs::backtrace::trace_unsynchronized::h5a69c674b2d9ea5c [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/../../backtrace/src/backtrace/mod.rs:66 [INFO] [stdout] 2: 0x5584029b0010 - std::sys_common::backtrace::_print_fmt::hdf72478dfcb50678 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:79 [INFO] [stdout] 3: 0x5584029b0010 - ::fmt::h1e0bdbb35e83deca [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:58 [INFO] [stdout] 4: 0x5584029c899c - core::fmt::write::he67f9b17bcb7ee73 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/fmt/mod.rs:1080 [INFO] [stdout] 5: 0x5584029ae6f2 - std::io::Write::write_fmt::hac97d5cb5753e2ec [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/io/mod.rs:1516 [INFO] [stdout] 6: 0x5584029b213d - std::sys_common::backtrace::_print::haa20918e28a126c5 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:61 [INFO] [stdout] 7: 0x5584029b213d - std::sys_common::backtrace::print::h49e772a4873d9076 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:48 [INFO] [stdout] 8: 0x5584029b213d - std::panicking::default_hook::{{closure}}::hb218b305d15e3f11 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:208 [INFO] [stdout] 9: 0x5584029b1de8 - std::panicking::default_hook::h63997b7b949e1ce0 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:227 [INFO] [stdout] 10: 0x5584029b27c1 - std::panicking::rust_panic_with_hook::hb54f09ccadf64bd3 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:577 [INFO] [stdout] 11: 0x5584029b2369 - std::panicking::begin_panic_handler::{{closure}}::h8b43445b254eeb30 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:484 [INFO] [stdout] 12: 0x5584029b049c - std::sys_common::backtrace::__rust_end_short_backtrace::hacd691450edfeae0 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/sys_common/backtrace.rs:153 [INFO] [stdout] 13: 0x5584029b2329 - rust_begin_unwind [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:483 [INFO] [stdout] 14: 0x5584029c7cb1 - core::panicking::panic_fmt::h5b17d4a0e853d0f5 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/panicking.rs:85 [INFO] [stdout] 15: 0x5584029c7bfd - core::panicking::panic::hc6be4d7009fb30ae [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/panicking.rs:50 [INFO] [stdout] 16: 0x55840294d35a - skiplist::skipmap::SkipMap::remove::h51186d602ad40b8e [INFO] [stdout] 17: 0x55840294e5c6 - rust_out::main::h405f65324f7b53be [INFO] [stdout] 18: 0x558402945b33 - core::ops::function::FnOnce::call_once::h5c25fabf55f68cb0 [INFO] [stdout] 19: 0x558402945389 - std::sys_common::backtrace::__rust_begin_short_backtrace::he48b78818c6bb8fc [INFO] [stdout] 20: 0x558402945419 - std::rt::lang_start::{{closure}}::h2090de6a9fc357b8 [INFO] [stdout] 21: 0x5584029b2be7 - core::ops::function::impls:: for &F>::call_once::h908982dfc31b926f [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/core/src/ops/function.rs:259 [INFO] [stdout] 22: 0x5584029b2be7 - std::panicking::try::do_call::h92777899503b7584 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:381 [INFO] [stdout] 23: 0x5584029b2be7 - std::panicking::try::h8815656b2b76e792 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panicking.rs:345 [INFO] [stdout] 24: 0x5584029b2be7 - std::panic::catch_unwind::h112ab81228f50b46 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/panic.rs:382 [INFO] [stdout] 25: 0x5584029b2be7 - std::rt::lang_start_internal::h1772a706c7575c24 [INFO] [stdout] at /rustc/212e76c31d461462544b5d516d3bdc99fc8f016e/library/std/src/rt.rs:51 [INFO] [stdout] 26: 0x5584029453f8 - std::rt::lang_start::h5654c047948033d3 [INFO] [stdout] 27: 0x55840294e81b - main [INFO] [stdout] 28: 0x7fc72182b0b3 - __libc_start_main [INFO] [stdout] 29: 0x5584029450be - _start [INFO] [stdout] 30: 0x0 - [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] src/skipmap.rs - skipmap::SkipMap::remove (line 674) [INFO] [stdout] [INFO] [stdout] test result: FAILED. 68 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out [INFO] [stdout] [INFO] [stderr] error: test failed, to rerun pass '--doc' [INFO] running `Command { std: "docker" "inspect" "5c2eb5e3f5b636b70445fcf49bf1f5ef1a4ea8c62835356f3152cbead5e4c784", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5c2eb5e3f5b636b70445fcf49bf1f5ef1a4ea8c62835356f3152cbead5e4c784", kill_on_drop: false }` [INFO] [stdout] 5c2eb5e3f5b636b70445fcf49bf1f5ef1a4ea8c62835356f3152cbead5e4c784