[INFO] fetching crate art-tree 0.2.0...
[INFO] checking art-tree-0.2.0 against master#3f1be1ec7ec3d8e80beb381ee82164a0aa3ca777 for pr-132289
[INFO] extracting crate art-tree 0.2.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate art-tree 0.2.0 on toolchain 3f1be1ec7ec3d8e80beb381ee82164a0aa3ca777
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3f1be1ec7ec3d8e80beb381ee82164a0aa3ca777" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate art-tree 0.2.0
[INFO] finished tweaking crates.io crate art-tree 0.2.0
[INFO] tweaked toml for crates.io crate art-tree 0.2.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3f1be1ec7ec3d8e80beb381ee82164a0aa3ca777" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 79 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.3.6 (available: v0.5.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3f1be1ec7ec3d8e80beb381ee82164a0aa3ca777" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+3f1be1ec7ec3d8e80beb381ee82164a0aa3ca777" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1abeebc1ffb5eca224382b7ff8b46697ff79401848404114fcf9f9bc90c1726a
[INFO] running `Command { std: "docker" "start" "-a" "1abeebc1ffb5eca224382b7ff8b46697ff79401848404114fcf9f9bc90c1726a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1abeebc1ffb5eca224382b7ff8b46697ff79401848404114fcf9f9bc90c1726a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1abeebc1ffb5eca224382b7ff8b46697ff79401848404114fcf9f9bc90c1726a", kill_on_drop: false }`
[INFO] [stdout] 1abeebc1ffb5eca224382b7ff8b46697ff79401848404114fcf9f9bc90c1726a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+3f1be1ec7ec3d8e80beb381ee82164a0aa3ca777" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8fc3a8f2f5a11329501902bb5764d01c2a87b4cb78fb1a712f081a9f0709b048
[INFO] running `Command { std: "docker" "start" "-a" "8fc3a8f2f5a11329501902bb5764d01c2a87b4cb78fb1a712f081a9f0709b048", kill_on_drop: false }`
[INFO] [stderr]     Checking plotters-backend v0.3.7
[INFO] [stderr]     Checking regex-syntax v0.8.5
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking unicode-width v0.1.14
[INFO] [stderr]     Checking csv-core v0.1.11
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking cast v0.3.0
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking half v1.8.3
[INFO] [stderr]     Checking oorandom v11.1.4
[INFO] [stderr]     Checking art-tree v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling syn v2.0.85
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking walkdir v2.5.0
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/node.rs:244:9
[INFO] [stdout]     |
[INFO] [stdout] 241 |               return Some(val);
[INFO] [stdout]     |               ---------------- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 244 | /         for i in 0..self.keys.len() {
[INFO] [stdout] 245 | |             // find key which uses last cell inside values array
[INFO] [stdout] 246 | |             if self.keys[i] == self.len as u8 {
[INFO] [stdout] 247 | |                 // move value of key which points to last array cell
[INFO] [stdout] ...   |
[INFO] [stdout] 252 | |             }
[INFO] [stdout] 253 | |         }
[INFO] [stdout]     | |_________^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking csv v1.3.0
[INFO] [stderr]     Checking serde_cbor v0.11.2
[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/lib.rs:290:13
[INFO] [stdout]     |
[INFO] [stdout] 290 |             &mut *(interim as *const BoxedNode<TypedNode<K, V>> as *mut BoxedNode<TypedNode<K, V>>)
[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]     Checking plotters-svg v0.3.7
[INFO] [stdout] warning: the type `[Option<V>; 256]` does not permit being left uninitialized
[INFO] [stdout]    --> src/node.rs:378:22
[INFO] [stdout]     |
[INFO] [stdout] 378 |             unsafe { MaybeUninit::<[Option<V>; 256]>::uninit().assume_init() };
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      this code causes undefined behavior when executed
[INFO] [stdout]     |                      help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
[INFO] [stdout]     |
[INFO] [stdout] note: enums with multiple inhabited variants have to be initialized to a variant
[INFO] [stdout]    --> /rustc/3f1be1ec7ec3d8e80beb381ee82164a0aa3ca777/library/core/src/option.rs:571:1
[INFO] [stdout]     = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `art-tree` (lib) due to 1 previous error; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "8fc3a8f2f5a11329501902bb5764d01c2a87b4cb78fb1a712f081a9f0709b048", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8fc3a8f2f5a11329501902bb5764d01c2a87b4cb78fb1a712f081a9f0709b048", kill_on_drop: false }`
[INFO] [stdout] 8fc3a8f2f5a11329501902bb5764d01c2a87b4cb78fb1a712f081a9f0709b048
