[INFO] fetching crate biheap 0.5.1...
[INFO] checking biheap-0.5.1 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate biheap 0.5.1 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate biheap 0.5.1 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate biheap 0.5.1
[INFO] finished tweaking crates.io crate biheap 0.5.1
[INFO] tweaked toml for crates.io crate biheap 0.5.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0f7a360d064c4d0d47d4b0ac1939286b0c37150dc775fc040096d8b02137cf91
[INFO] running `Command { std: "docker" "start" "-a" "0f7a360d064c4d0d47d4b0ac1939286b0c37150dc775fc040096d8b02137cf91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0f7a360d064c4d0d47d4b0ac1939286b0c37150dc775fc040096d8b02137cf91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f7a360d064c4d0d47d4b0ac1939286b0c37150dc775fc040096d8b02137cf91", kill_on_drop: false }`
[INFO] [stdout] 0f7a360d064c4d0d47d4b0ac1939286b0c37150dc775fc040096d8b02137cf91
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a2be174f3368e579a9ee0da599cf723ff0d3eea9aa8eba044410bc81b1d6d63e
[INFO] running `Command { std: "docker" "start" "-a" "a2be174f3368e579a9ee0da599cf723ff0d3eea9aa8eba044410bc81b1d6d63e", kill_on_drop: false }`
[INFO] [stderr]     Checking biheap v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/core/bubble.rs:124:17
[INFO] [stdout]     |
[INFO] [stdout] 124 |             let mut this = unsafe { &mut *this.get() };
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/core/bubble.rs:125:17
[INFO] [stdout]     |
[INFO] [stdout] 125 |             let mut cell = unsafe { &mut *cell_ref.get() }; 
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/core/push.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |         drop(borrow); 
[INFO] [stdout]    |         ^^^^^------^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              argument has type `&mut bivec::BiVec<std::rc::Rc<std::cell::UnsafeCell<core::Node<T>>>>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 25 -         drop(borrow); 
[INFO] [stdout] 25 +         let _ = borrow; 
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/core/bubble.rs:89:25
[INFO] [stdout]    |
[INFO] [stdout] 89 |                         drop(left_ref); 
[INFO] [stdout]    |                         ^^^^^--------^
[INFO] [stdout]    |                              |
[INFO] [stdout]    |                              argument has type `&mut core::Node<T>`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 89 -                         drop(left_ref); 
[INFO] [stdout] 89 +                         let _ = left_ref; 
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/core/bubble.rs:93:25
[INFO] [stdout]    |
[INFO] [stdout] 93 |                         drop(right_ref); 
[INFO] [stdout]    |                         ^^^^^---------^
[INFO] [stdout]    |                              |
[INFO] [stdout]    |                              argument has type `&mut core::Node<T>`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 93 -                         drop(right_ref); 
[INFO] [stdout] 93 +                         let _ = right_ref; 
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/core/bubble.rs:99:25
[INFO] [stdout]    |
[INFO] [stdout] 99 |                         drop(left_ref); 
[INFO] [stdout]    |                         ^^^^^--------^
[INFO] [stdout]    |                              |
[INFO] [stdout]    |                              argument has type `&mut core::Node<T>`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 99 -                         drop(left_ref); 
[INFO] [stdout] 99 +                         let _ = left_ref; 
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/core/bubble.rs:103:25
[INFO] [stdout]     |
[INFO] [stdout] 103 |                         drop(right_ref); 
[INFO] [stdout]     |                         ^^^^^---------^
[INFO] [stdout]     |                              |
[INFO] [stdout]     |                              argument has type `&mut core::Node<T>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 103 -                         drop(right_ref); 
[INFO] [stdout] 103 +                         let _ = right_ref; 
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/core/peek.rs:117:9
[INFO] [stdout]     |
[INFO] [stdout] 117 |         drop(bivec); 
[INFO] [stdout]     |         ^^^^^-----^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut bivec::BiVec<std::rc::Rc<std::cell::UnsafeCell<core::Node<T>>>>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 117 -         drop(bivec); 
[INFO] [stdout] 117 +         let _ = bivec; 
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/core/bubble.rs:124:17
[INFO] [stdout]     |
[INFO] [stdout] 124 |             let mut this = unsafe { &mut *this.get() };
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/core/bubble.rs:125:17
[INFO] [stdout]     |
[INFO] [stdout] 125 |             let mut cell = unsafe { &mut *cell_ref.get() }; 
[INFO] [stdout]     |                 ----^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/core/push.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |         drop(borrow); 
[INFO] [stdout]    |         ^^^^^------^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              argument has type `&mut bivec::BiVec<std::rc::Rc<std::cell::UnsafeCell<core::Node<T>>>>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 25 -         drop(borrow); 
[INFO] [stdout] 25 +         let _ = borrow; 
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/core/bubble.rs:89:25
[INFO] [stdout]    |
[INFO] [stdout] 89 |                         drop(left_ref); 
[INFO] [stdout]    |                         ^^^^^--------^
[INFO] [stdout]    |                              |
[INFO] [stdout]    |                              argument has type `&mut core::Node<T>`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 89 -                         drop(left_ref); 
[INFO] [stdout] 89 +                         let _ = left_ref; 
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/core/bubble.rs:93:25
[INFO] [stdout]    |
[INFO] [stdout] 93 |                         drop(right_ref); 
[INFO] [stdout]    |                         ^^^^^---------^
[INFO] [stdout]    |                              |
[INFO] [stdout]    |                              argument has type `&mut core::Node<T>`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 93 -                         drop(right_ref); 
[INFO] [stdout] 93 +                         let _ = right_ref; 
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> src/core/bubble.rs:99:25
[INFO] [stdout]    |
[INFO] [stdout] 99 |                         drop(left_ref); 
[INFO] [stdout]    |                         ^^^^^--------^
[INFO] [stdout]    |                              |
[INFO] [stdout]    |                              argument has type `&mut core::Node<T>`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 99 -                         drop(left_ref); 
[INFO] [stdout] 99 +                         let _ = left_ref; 
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/core/bubble.rs:103:25
[INFO] [stdout]     |
[INFO] [stdout] 103 |                         drop(right_ref); 
[INFO] [stdout]     |                         ^^^^^---------^
[INFO] [stdout]     |                              |
[INFO] [stdout]     |                              argument has type `&mut core::Node<T>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 103 -                         drop(right_ref); 
[INFO] [stdout] 103 +                         let _ = right_ref; 
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/core/peek.rs:117:9
[INFO] [stdout]     |
[INFO] [stdout] 117 |         drop(bivec); 
[INFO] [stdout]     |         ^^^^^-----^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              argument has type `&mut bivec::BiVec<std::rc::Rc<std::cell::UnsafeCell<core::Node<T>>>>`
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 117 -         drop(bivec); 
[INFO] [stdout] 117 +         let _ = bivec; 
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "a2be174f3368e579a9ee0da599cf723ff0d3eea9aa8eba044410bc81b1d6d63e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2be174f3368e579a9ee0da599cf723ff0d3eea9aa8eba044410bc81b1d6d63e", kill_on_drop: false }`
[INFO] [stdout] a2be174f3368e579a9ee0da599cf723ff0d3eea9aa8eba044410bc81b1d6d63e