[INFO] fetching crate libm 0.2.1...
[INFO] checking libm-0.2.1 against try#8de4b308b608cded0ebccf658a0fc719bce87d4e for pr-89056
[INFO] extracting crate libm 0.2.1 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate libm 0.2.1 on toolchain 8de4b308b608cded0ebccf658a0fc719bce87d4e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate libm 0.2.1
[INFO] finished tweaking crates.io crate libm 0.2.1
[INFO] tweaked toml for crates.io crate libm 0.2.1 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d7f4155b9219f1653795f2afdddd5d2be3b8eb93dc5a3558fc7472ff6f6c9949
[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" "d7f4155b9219f1653795f2afdddd5d2be3b8eb93dc5a3558fc7472ff6f6c9949", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d7f4155b9219f1653795f2afdddd5d2be3b8eb93dc5a3558fc7472ff6f6c9949", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7f4155b9219f1653795f2afdddd5d2be3b8eb93dc5a3558fc7472ff6f6c9949", kill_on_drop: false }`
[INFO] [stdout] d7f4155b9219f1653795f2afdddd5d2be3b8eb93dc5a3558fc7472ff6f6c9949
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 057b71eb1f5ec1b0bf5276727d16daa8d3eae17a98151b086d9f93215c22ebbe
[INFO] running `Command { std: "docker" "start" "-a" "057b71eb1f5ec1b0bf5276727d16daa8d3eae17a98151b086d9f93215c22ebbe", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling libm v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling no-panic v0.1.15
[INFO] [stdout] error: unused borrow that must be used
[INFO] [stdout]    --> src/math/pow.rs:607:9
[INFO] [stdout]     |
[INFO] [stdout] 607 | /         &[POS_ZERO, NEG_ZERO, POS_ONE, NEG_ONE, POS_EVENS, NEG_EVENS]
[INFO] [stdout] 608 | |             .iter()
[INFO] [stdout] 609 | |             .for_each(|int_set| {
[INFO] [stdout] 610 | |                 int_set.iter().for_each(|int| {
[INFO] [stdout] ...   |
[INFO] [stdout] 614 | |                 })
[INFO] [stdout] 615 | |             });
[INFO] [stdout]     | |______________^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:2:9
[INFO] [stdout]     |
[INFO] [stdout] 2   | #![deny(warnings)]
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     = note: `#[deny(unused_must_use)]` implied by `#[deny(warnings)]`
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 607 |         let _ = &[POS_ZERO, NEG_ZERO, POS_ONE, NEG_ONE, POS_EVENS, NEG_EVENS]
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unused borrow that must be used
[INFO] [stdout]    --> src/math/pow.rs:619:9
[INFO] [stdout]     |
[INFO] [stdout] 619 | /         &NEG[1..(NEG.len() - 1)].iter().for_each(|set| {
[INFO] [stdout] 620 | |             set.iter().for_each(|val| {
[INFO] [stdout] 621 | |                 test_sets(&ALL[3..7], &|v: f64| pow(*val, v), &|_| NAN);
[INFO] [stdout] 622 | |             })
[INFO] [stdout] 623 | |         });
[INFO] [stdout]     | |__________^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 619 |         let _ = &NEG[1..(NEG.len() - 1)].iter().for_each(|set| {
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `libm` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "057b71eb1f5ec1b0bf5276727d16daa8d3eae17a98151b086d9f93215c22ebbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "057b71eb1f5ec1b0bf5276727d16daa8d3eae17a98151b086d9f93215c22ebbe", kill_on_drop: false }`
[INFO] [stdout] 057b71eb1f5ec1b0bf5276727d16daa8d3eae17a98151b086d9f93215c22ebbe