[INFO] fetching crate toy_arena 0.2.0...
[INFO] checking toy_arena-0.2.0 against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] extracting crate toy_arena 0.2.0 into /workspace/builds/worker-31/source
[INFO] validating manifest of crates.io crate toy_arena 0.2.0 on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate toy_arena 0.2.0
[INFO] finished tweaking crates.io crate toy_arena 0.2.0
[INFO] tweaked toml for crates.io crate toy_arena 0.2.0 written to /workspace/builds/worker-31/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "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-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c05198295d75ce8e3f9d0134109613ef83fb23d46692654bb1e0cab72003932e
[INFO] running `Command { std: "docker" "start" "-a" "c05198295d75ce8e3f9d0134109613ef83fb23d46692654bb1e0cab72003932e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c05198295d75ce8e3f9d0134109613ef83fb23d46692654bb1e0cab72003932e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c05198295d75ce8e3f9d0134109613ef83fb23d46692654bb1e0cab72003932e", kill_on_drop: false }`
[INFO] [stdout] c05198295d75ce8e3f9d0134109613ef83fb23d46692654bb1e0cab72003932e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69a86fe05cd399992ec4df5f35fd648c3c9235783f5e74f92b3e61eb99fcca65
[INFO] running `Command { std: "docker" "start" "-a" "69a86fe05cd399992ec4df5f35fd648c3c9235783f5e74f92b3e61eb99fcca65", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]     Checking toy_arena v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/tree/iter_mut.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |         unsafe { &*self.inner.as_ref().tree.get() }
[INFO] [stdout]    |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/tree/iter_mut.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         unsafe { &mut *self.inner.as_ref().tree.get() }
[INFO] [stdout]    |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/tree/iter_mut.rs:87:20
[INFO] [stdout]    |
[INFO] [stdout] 87 |         let tree = unsafe { self.bind.tree() };
[INFO] [stdout]    |                    ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/tree/iter_mut.rs:92:20
[INFO] [stdout]    |
[INFO] [stdout] 92 |         let tree = unsafe { self.bind.tree_mut() };
[INFO] [stdout]    |                    ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_parent`
[INFO] [stdout]   --> src/tree/link.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn set_parent(&mut self, parent: Option<Slot>) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/tree/iter_mut.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |         unsafe { &*self.inner.as_ref().tree.get() }
[INFO] [stdout]    |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/tree/iter_mut.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         unsafe { &mut *self.inner.as_ref().tree.get() }
[INFO] [stdout]    |         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/tree/iter_mut.rs:87:20
[INFO] [stdout]    |
[INFO] [stdout] 87 |         let tree = unsafe { self.bind.tree() };
[INFO] [stdout]    |                    ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]   --> src/tree/iter_mut.rs:92:20
[INFO] [stdout]    |
[INFO] [stdout] 92 |         let tree = unsafe { self.bind.tree_mut() };
[INFO] [stdout]    |                    ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_parent`
[INFO] [stdout]   --> src/tree/link.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn set_parent(&mut self, parent: Option<Slot>) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.30s
[INFO] running `Command { std: "docker" "inspect" "69a86fe05cd399992ec4df5f35fd648c3c9235783f5e74f92b3e61eb99fcca65", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69a86fe05cd399992ec4df5f35fd648c3c9235783f5e74f92b3e61eb99fcca65", kill_on_drop: false }`
[INFO] [stdout] 69a86fe05cd399992ec4df5f35fd648c3c9235783f5e74f92b3e61eb99fcca65