[INFO] fetching crate mut-binary-heap 0.1.0... [INFO] testing mut-binary-heap-0.1.0 against master#caccb4d0368bd918ef6668af8e13834d07040417 for pr-146098-1 [INFO] extracting crate mut-binary-heap 0.1.0 into /workspace/builds/worker-2-tc1/source [INFO] started tweaking crates.io crate mut-binary-heap 0.1.0 [INFO] finished tweaking crates.io crate mut-binary-heap 0.1.0 [INFO] tweaked toml for crates.io crate mut-binary-heap 0.1.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml [INFO] validating manifest of crates.io crate mut-binary-heap 0.1.0 on toolchain caccb4d0368bd918ef6668af8e13834d07040417 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate crates.io crate mut-binary-heap 0.1.0 already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded serde_derive v1.0.155 [INFO] [stderr] Downloaded compare v0.1.0 [INFO] [stderr] Downloaded serde v1.0.155 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 3f0e7c55597ab25b1302f434650871dcb733a5274cc880736ed82453cab1ecb4 [INFO] running `Command { std: "docker" "start" "-a" "3f0e7c55597ab25b1302f434650871dcb733a5274cc880736ed82453cab1ecb4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "3f0e7c55597ab25b1302f434650871dcb733a5274cc880736ed82453cab1ecb4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3f0e7c55597ab25b1302f434650871dcb733a5274cc880736ed82453cab1ecb4", kill_on_drop: false }` [INFO] [stdout] 3f0e7c55597ab25b1302f434650871dcb733a5274cc880736ed82453cab1ecb4 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+caccb4d0368bd918ef6668af8e13834d07040417" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 9a3a11cba8e6a6c7bd84fa9b051f21ef040a052b42e9885ba76d4f309aec82f9 [INFO] running `Command { std: "docker" "start" "-a" "9a3a11cba8e6a6c7bd84fa9b051f21ef040a052b42e9885ba76d4f309aec82f9", kill_on_drop: false }` [INFO] [stderr] Compiling compare v0.1.0 [INFO] [stderr] Compiling mut-binary-heap v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unnecessary parentheses around closure body [INFO] [stdout] --> src/binary_heap.rs:2138:35 [INFO] [stdout] | [INFO] [stdout] 2138 | self.iter.last().map(|kv| (&kv.1)) [INFO] [stdout] | ^ ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] help: remove these parentheses [INFO] [stdout] | [INFO] [stdout] 2138 - self.iter.last().map(|kv| (&kv.1)) [INFO] [stdout] 2138 + self.iter.last().map(|kv| &kv.1) [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unnecessary parentheses around closure body [INFO] [stdout] --> src/binary_heap.rs:2164:35 [INFO] [stdout] | [INFO] [stdout] 2164 | self.iter.last().map(|kv| (&kv.0)) [INFO] [stdout] | ^ ^ [INFO] [stdout] | [INFO] [stdout] help: remove these parentheses [INFO] [stdout] | [INFO] [stdout] 2164 - self.iter.last().map(|kv| (&kv.0)) [INFO] [stdout] 2164 + self.iter.last().map(|kv| &kv.0) [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` [INFO] [stdout] --> src/binary_heap.rs:2211:34 [INFO] [stdout] | [INFO] [stdout] 2204 | let mut_ptr: *mut T = ptr as *mut T; [INFO] [stdout] | ------------- casting happened here [INFO] [stdout] ... [INFO] [stdout] 2211 | let value = unsafe { &mut *mut_ptr }; [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: for more information, visit [INFO] [stdout] = note: `#[deny(invalid_reference_casting)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `mut-binary-heap` (lib) due to 1 previous error; 2 warnings emitted [INFO] running `Command { std: "docker" "inspect" "9a3a11cba8e6a6c7bd84fa9b051f21ef040a052b42e9885ba76d4f309aec82f9", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "9a3a11cba8e6a6c7bd84fa9b051f21ef040a052b42e9885ba76d4f309aec82f9", kill_on_drop: false }` [INFO] [stdout] 9a3a11cba8e6a6c7bd84fa9b051f21ef040a052b42e9885ba76d4f309aec82f9