[INFO] fetching crate art-tree 0.2.0...
[INFO] checking art-tree-0.2.0 against master#80399064afa4a2cd153f30d02c25f7ea0383ed65 for opaque-soundness-fix
[INFO] extracting crate art-tree 0.2.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate art-tree 0.2.0 on toolchain 80399064afa4a2cd153f30d02c25f7ea0383ed65
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80399064afa4a2cd153f30d02c25f7ea0383ed65" "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-1-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80399064afa4a2cd153f30d02c25f7ea0383ed65" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80399064afa4a2cd153f30d02c25f7ea0383ed65" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+80399064afa4a2cd153f30d02c25f7ea0383ed65" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f61ab34348e86cbc9e65938d43854c53b1116c8e0afde2cf42dbf7fe0f7c7751
[INFO] running `Command { std: "docker" "start" "-a" "f61ab34348e86cbc9e65938d43854c53b1116c8e0afde2cf42dbf7fe0f7c7751", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f61ab34348e86cbc9e65938d43854c53b1116c8e0afde2cf42dbf7fe0f7c7751", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f61ab34348e86cbc9e65938d43854c53b1116c8e0afde2cf42dbf7fe0f7c7751", kill_on_drop: false }`
[INFO] [stdout] f61ab34348e86cbc9e65938d43854c53b1116c8e0afde2cf42dbf7fe0f7c7751
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+80399064afa4a2cd153f30d02c25f7ea0383ed65" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4187d965858d4501ddcc2bf9ba0a76b0e1b4e1679e9987fab673d72636a674fc
[INFO] running `Command { std: "docker" "start" "-a" "4187d965858d4501ddcc2bf9ba0a76b0e1b4e1679e9987fab673d72636a674fc", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]    Compiling serde_json v1.0.114
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]    Compiling rayon-core v1.12.1
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking either v1.10.0
[INFO] [stderr]     Checking memchr v2.7.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.5
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling syn v2.0.53
[INFO] [stderr]     Checking csv-core v0.1.11
[INFO] [stderr]     Checking half v1.8.3
[INFO] [stderr]     Checking walkdir v2.5.0
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking rayon v1.9.0
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking regex v1.10.4
[INFO] [stderr]     Checking plotters v0.3.5
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking art-tree v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Leaf` is imported redundantly
[INFO] [stdout]  --> src/scanner.rs:2:18
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::node::*;
[INFO] [stdout]   |     -------------- the item `Leaf` is already imported here
[INFO] [stdout] 2 | use crate::{Key, Leaf, TypedNode};
[INFO] [stdout]   |                  ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TypedNode` is imported redundantly
[INFO] [stdout]  --> src/scanner.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::node::*;
[INFO] [stdout]   |     -------------- the item `TypedNode` is already imported here
[INFO] [stdout] 2 | use crate::{Key, Leaf, TypedNode};
[INFO] [stdout]   |                        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Some` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 | use std::option::Option::Some;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   --> /rustc/80399064afa4a2cd153f30d02c25f7ea0383ed65/library/std/src/prelude/mod.rs:115:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `Some` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[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] [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] [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/80399064afa4a2cd153f30d02c25f7ea0383ed65/library/core/src/option.rs:572:1
[INFO] [stdout]     = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `art-tree` (lib) due to 2 previous errors; 5 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "4187d965858d4501ddcc2bf9ba0a76b0e1b4e1679e9987fab673d72636a674fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4187d965858d4501ddcc2bf9ba0a76b0e1b4e1679e9987fab673d72636a674fc", kill_on_drop: false }`
[INFO] [stdout] 4187d965858d4501ddcc2bf9ba0a76b0e1b4e1679e9987fab673d72636a674fc
