[INFO] fetching crate art-tree 0.2.0...
[INFO] testing art-tree-0.2.0 against try#c2e32f1c9652b13ed99608599c1e855462f421f3 for pr-146098-7
[INFO] extracting crate art-tree 0.2.0 into /workspace/builds/worker-3-tc2/source
[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-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate art-tree 0.2.0 on toolchain c2e32f1c9652b13ed99608599c1e855462f421f3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 70 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.3.6 (available: v0.7.0)
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ee63ea7e6aa1355361da3e172ba41f4ad5529a0957d94455e21cbeba62d62ed6
[INFO] running `Command { std: "docker" "start" "-a" "ee63ea7e6aa1355361da3e172ba41f4ad5529a0957d94455e21cbeba62d62ed6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ee63ea7e6aa1355361da3e172ba41f4ad5529a0957d94455e21cbeba62d62ed6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee63ea7e6aa1355361da3e172ba41f4ad5529a0957d94455e21cbeba62d62ed6", kill_on_drop: false }`
[INFO] [stdout] ee63ea7e6aa1355361da3e172ba41f4ad5529a0957d94455e21cbeba62d62ed6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 568b02d30b1a9a881a3e031de17c4bdea05b86c62691f6a85eb043516c8b1d18
[INFO] running `Command { std: "docker" "start" "-a" "568b02d30b1a9a881a3e031de17c4bdea05b86c62691f6a85eb043516c8b1d18", kill_on_drop: false }`
[INFO] [stderr]    Compiling art-tree v0.2.0 (/opt/rustwide/workdir)
[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] ...   |
[INFO] [stdout] 253 | |         }
[INFO] [stdout]     | |_________^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/node.rs:244:13
[INFO] [stdout]     |
[INFO] [stdout] 244 |         for i in 0..self.keys.len() {
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) 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: unnecessary transmute
[INFO] [stdout]    --> src/keys.rs:100:30
[INFO] [stdout]     |
[INFO] [stdout] 100 |         let v: u8 = unsafe { mem::transmute(*self) };
[INFO] [stdout]     |                              --------------^^^^^^^
[INFO] [stdout]     |                              |
[INFO] [stdout]     |                              help: replace this with: `i8::cast_unsigned`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unnecessary_transmutes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]    --> src/keys.rs:117:31
[INFO] [stdout]     |
[INFO] [stdout] 117 |         let v: u16 = unsafe { mem::transmute(*self) };
[INFO] [stdout]     |                               --------------^^^^^^^
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               help: replace this with: `i16::cast_unsigned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]    --> src/keys.rs:127:31
[INFO] [stdout]     |
[INFO] [stdout] 127 |         let v: u32 = unsafe { mem::transmute(*self) };
[INFO] [stdout]     |                               --------------^^^^^^^
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               help: replace this with: `i32::cast_unsigned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]    --> src/keys.rs:137:31
[INFO] [stdout]     |
[INFO] [stdout] 137 |         let v: u64 = unsafe { mem::transmute(*self) };
[INFO] [stdout]     |                               --------------^^^^^^^
[INFO] [stdout]     |                               |
[INFO] [stdout]     |                               help: replace this with: `i64::cast_unsigned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary transmute
[INFO] [stdout]    --> src/keys.rs:147:32
[INFO] [stdout]     |
[INFO] [stdout] 147 |         let v: u128 = unsafe { mem::transmute(*self) };
[INFO] [stdout]     |                                --------------^^^^^^^
[INFO] [stdout]     |                                |
[INFO] [stdout]     |                                help: replace this with: `i128::cast_unsigned`
[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/c2e32f1c9652b13ed99608599c1e855462f421f3/library/core/src/option.rs:599:0
[INFO] [stdout]     = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/node.rs:585:17
[INFO] [stdout]     |
[INFO] [stdout] 585 |     pub fn iter(&self) -> NodeIter<V> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 585 |     pub fn iter(&self) -> NodeIter<'_, V> {
[INFO] [stdout]     |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `art-tree` (lib) due to 1 previous error; 9 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "568b02d30b1a9a881a3e031de17c4bdea05b86c62691f6a85eb043516c8b1d18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "568b02d30b1a9a881a3e031de17c4bdea05b86c62691f6a85eb043516c8b1d18", kill_on_drop: false }`
[INFO] [stdout] 568b02d30b1a9a881a3e031de17c4bdea05b86c62691f6a85eb043516c8b1d18
