[INFO] fetching crate mut-binary-heap 0.1.0...
[INFO] testing mut-binary-heap-0.1.0 against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] extracting crate mut-binary-heap 0.1.0 into /workspace/builds/worker-7-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-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mut-binary-heap 0.1.0 on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "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" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5ddd12e12f7e3312cbebddfe6eb72dac5ea41b36a3770e71a3877fcb2803ade0
[INFO] running `Command { std: "docker" "start" "-a" "5ddd12e12f7e3312cbebddfe6eb72dac5ea41b36a3770e71a3877fcb2803ade0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5ddd12e12f7e3312cbebddfe6eb72dac5ea41b36a3770e71a3877fcb2803ade0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ddd12e12f7e3312cbebddfe6eb72dac5ea41b36a3770e71a3877fcb2803ade0", kill_on_drop: false }`
[INFO] [stdout] 5ddd12e12f7e3312cbebddfe6eb72dac5ea41b36a3770e71a3877fcb2803ade0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ed81534090ac3beb1af8a2e7d2ae003f292133eb690bcc73cb43b03845d46adc
[INFO] running `Command { std: "docker" "start" "-a" "ed81534090ac3beb1af8a2e7d2ae003f292133eb690bcc73cb43b03845d46adc", 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 <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
[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" "ed81534090ac3beb1af8a2e7d2ae003f292133eb690bcc73cb43b03845d46adc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed81534090ac3beb1af8a2e7d2ae003f292133eb690bcc73cb43b03845d46adc", kill_on_drop: false }`
[INFO] [stdout] ed81534090ac3beb1af8a2e7d2ae003f292133eb690bcc73cb43b03845d46adc