[INFO] fetching crate symbolics_core 0.1.5...
[INFO] checking symbolics_core-0.1.5 against master#7b3a7819371cef92a187e9bac8f7810ccde15216 for pr-74846
[INFO] extracting crate symbolics_core 0.1.5 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate symbolics_core 0.1.5 on toolchain 7b3a7819371cef92a187e9bac8f7810ccde15216
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate symbolics_core 0.1.5
[INFO] finished tweaking crates.io crate symbolics_core 0.1.5
[INFO] tweaked toml for crates.io crate symbolics_core 0.1.5 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cd1a9851ea18a326c19950f7fe6fde15ac2a4cd1d5cbfa63a09b6f1a3f72f226
[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" "cd1a9851ea18a326c19950f7fe6fde15ac2a4cd1d5cbfa63a09b6f1a3f72f226", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cd1a9851ea18a326c19950f7fe6fde15ac2a4cd1d5cbfa63a09b6f1a3f72f226", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd1a9851ea18a326c19950f7fe6fde15ac2a4cd1d5cbfa63a09b6f1a3f72f226", kill_on_drop: false }`
[INFO] [stdout] cd1a9851ea18a326c19950f7fe6fde15ac2a4cd1d5cbfa63a09b6f1a3f72f226
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+7b3a7819371cef92a187e9bac8f7810ccde15216" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e406a508063098920ed6ca85919af98147b89e853c911a48a134b18288ea15f3
[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" "e406a508063098920ed6ca85919af98147b89e853c911a48a134b18288ea15f3", kill_on_drop: false }`
[INFO] [stderr]     Checking symbolics_core v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]  --> tests/building.rs:9:117
[INFO] [stdout]   |
[INFO] [stdout] 9 |     "Add(Add(Mul(Symbol(\"a\"), Pow(Symbol(\"x\"), Num(2.0))), Mul(Symbol(\"b\"), Symbol(\"x\"))), Symbol(\"c\"))");;
[INFO] [stdout]   |                                                                                                                     ^ help: remove this semicolon
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.24s
[INFO] running `Command { std: "docker" "inspect" "e406a508063098920ed6ca85919af98147b89e853c911a48a134b18288ea15f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e406a508063098920ed6ca85919af98147b89e853c911a48a134b18288ea15f3", kill_on_drop: false }`
[INFO] [stdout] e406a508063098920ed6ca85919af98147b89e853c911a48a134b18288ea15f3