[INFO] cloning repository https://github.com/JustinMeimar/btree-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JustinMeimar/btree-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJustinMeimar%2Fbtree-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJustinMeimar%2Fbtree-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e8e0c2c02794461555dc8123a210733e9bb6a5fd
[INFO] testing JustinMeimar/btree-rs against beta-2026-03-05 for beta-1.95-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJustinMeimar%2Fbtree-rs" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/JustinMeimar/btree-rs
[INFO] finished tweaking git repo https://github.com/JustinMeimar/btree-rs
[INFO] tweaked toml for git repo https://github.com/JustinMeimar/btree-rs written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/JustinMeimar/btree-rs on toolchain beta-2026-03-05
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-03-05" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/JustinMeimar/btree-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-03-05" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-03-05" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 99f88797d480f6b45b6318e023baec3b1e47aa563bd7296d1a6c957ce6c5917c
[INFO] running `Command { std: "docker" "start" "-a" "99f88797d480f6b45b6318e023baec3b1e47aa563bd7296d1a6c957ce6c5917c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "99f88797d480f6b45b6318e023baec3b1e47aa563bd7296d1a6c957ce6c5917c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99f88797d480f6b45b6318e023baec3b1e47aa563bd7296d1a6c957ce6c5917c", kill_on_drop: false }`
[INFO] [stdout] 99f88797d480f6b45b6318e023baec3b1e47aa563bd7296d1a6c957ce6c5917c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-03-05" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 08fd792a9ec227d693d402de8c8cddc6be1d137094bfae46475bc18edc25f75c
[INFO] running `Command { std: "docker" "start" "-a" "08fd792a9ec227d693d402de8c8cddc6be1d137094bfae46475bc18edc25f75c", kill_on_drop: false }`
[INFO] [stderr]    Compiling btree-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `dealloc` and `ptr::NonNull`
[INFO] [stdout]  --> src/slab.rs:1:26
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{alloc::{alloc, dealloc, Layout}, ops::DerefMut, ptr::NonNull};
[INFO] [stdout]   |                          ^^^^^^^                          ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::RefCell`
[INFO] [stdout]  --> src/slab.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::cell::RefCell;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Arc`
[INFO] [stdout]  --> src/slab.rs:4:24
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::sync::{Mutex, Arc};
[INFO] [stdout]   |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut sa = SlabAllocator::<String>::init(); 
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sa`
[INFO] [stdout]   --> src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut sa = SlabAllocator::<String>::init(); 
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sa`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Node` is never used
[INFO] [stdout]  --> src/main.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 7 | enum Node<K,V> {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `memory`, `free_list`, and `capacity` are never read
[INFO] [stdout]  --> src/slab.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct SlabAllocator<T> {
[INFO] [stdout]   |            ------------- fields in this struct
[INFO] [stdout] 7 |     memory: *mut T,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 8 |     free_list: Mutex<Vec<usize>>,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 9 |     capacity: usize,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SlabBox` is never constructed
[INFO] [stdout]   --> src/slab.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct SlabBox<'a, T> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `allocated`, `available`, `capacity`, and `alloc` are never used
[INFO] [stdout]   --> src/slab.rs:63:12
[INFO] [stdout]    |
[INFO] [stdout] 47 | impl<T> SlabAllocator<T> { 
[INFO] [stdout]    | ------------------------ methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 63 |     pub fn allocated(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 68 |     pub fn available(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 72 |     pub fn capacity(&self) -> usize { self.capacity }
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 73 |     
[INFO] [stdout] 74 |     pub fn alloc(&self, value: T) -> Option<SlabBox<T>>{
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/slab.rs:74:18
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn alloc(&self, value: T) -> Option<SlabBox<T>>{
[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] 74 |     pub fn alloc(&self, value: T) -> Option<SlabBox<'_, T>>{
[INFO] [stdout]    |                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.32s
[INFO] running `Command { std: "docker" "inspect" "08fd792a9ec227d693d402de8c8cddc6be1d137094bfae46475bc18edc25f75c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08fd792a9ec227d693d402de8c8cddc6be1d137094bfae46475bc18edc25f75c", kill_on_drop: false }`
[INFO] [stdout] 08fd792a9ec227d693d402de8c8cddc6be1d137094bfae46475bc18edc25f75c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-03-05" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 826b284a11f3a3ce510d103afd9841b7aa7f44af5e208cd76bf5227cb6609ede
[INFO] running `Command { std: "docker" "start" "-a" "826b284a11f3a3ce510d103afd9841b7aa7f44af5e208cd76bf5227cb6609ede", kill_on_drop: false }`
[INFO] [stderr]    Compiling btree-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `dealloc` and `ptr::NonNull`
[INFO] [stdout]  --> src/slab.rs:1:26
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{alloc::{alloc, dealloc, Layout}, ops::DerefMut, ptr::NonNull};
[INFO] [stdout]   |                          ^^^^^^^                          ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cell::RefCell`
[INFO] [stdout]  --> src/slab.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::cell::RefCell;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/slab.rs:114:6
[INFO] [stdout]     |
[INFO] [stdout] 114 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/slab.rs:126:6
[INFO] [stdout]     |
[INFO] [stdout] 126 |     };
[INFO] [stdout]     |      ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/slab.rs:148:54
[INFO] [stdout]     |
[INFO] [stdout] 148 |     struct C<'a, T> { a: T, b: Vec<T>, c: &'a mut T }; 
[INFO] [stdout]     |                                                      ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/slab.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     let mut sa = SlabAllocator::<String>::init();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/slab.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |     let mut init_string_box = sa.alloc(String::from("Bananas")).unwrap();
[INFO] [stdout]     |         ----^^^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/slab.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |     let mut sa = SlabAllocator::<A>::init();
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/slab.rs:129:9
[INFO] [stdout]     |
[INFO] [stdout] 129 |     let mut sa = SlabAllocator::<B>::init(); 
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/slab.rs:131:9
[INFO] [stdout]     |
[INFO] [stdout] 131 |     for i in 0..sa.capacity {
[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] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/slab.rs:149:9
[INFO] [stdout]     |
[INFO] [stdout] 149 |     let mut sa = SlabAllocator::<C<u32>>::init();
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/slab.rs:165:9
[INFO] [stdout]     |
[INFO] [stdout] 165 |     let mut sa = Arc::new(SlabAllocator::<i32>::init()); 
[INFO] [stdout]     |         ----^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut sa = SlabAllocator::<String>::init(); 
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sa`
[INFO] [stdout]   --> src/main.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let mut sa = SlabAllocator::<String>::init(); 
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sa`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Node` is never used
[INFO] [stdout]  --> src/main.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 7 | enum Node<K,V> {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x`, `y`, and `z` are never read
[INFO] [stdout]    --> src/slab.rs:111:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |     struct A {
[INFO] [stdout]     |            - fields in this struct
[INFO] [stdout] 111 |         x: u32,
[INFO] [stdout]     |         ^
[INFO] [stdout] 112 |         y: u32,
[INFO] [stdout]     |         ^
[INFO] [stdout] 113 |         z: (i32, i32),
[INFO] [stdout]     |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]    --> src/slab.rs:124:9
[INFO] [stdout]     |
[INFO] [stdout] 123 |     struct B {
[INFO] [stdout]     |            - fields in this struct
[INFO] [stdout] 124 |         x: u32,
[INFO] [stdout]     |         ^
[INFO] [stdout] 125 |         y: u32,
[INFO] [stdout]     |         ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a`, `b`, and `c` are never read
[INFO] [stdout]    --> src/slab.rs:148:23
[INFO] [stdout]     |
[INFO] [stdout] 148 |     struct C<'a, T> { a: T, b: Vec<T>, c: &'a mut T }; 
[INFO] [stdout]     |            -          ^     ^          ^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            fields in this struct
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/slab.rs:74:18
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn alloc(&self, value: T) -> Option<SlabBox<T>>{
[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] 74 |     pub fn alloc(&self, value: T) -> Option<SlabBox<'_, T>>{
[INFO] [stdout]    |                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.52s
[INFO] running `Command { std: "docker" "inspect" "826b284a11f3a3ce510d103afd9841b7aa7f44af5e208cd76bf5227cb6609ede", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "826b284a11f3a3ce510d103afd9841b7aa7f44af5e208cd76bf5227cb6609ede", kill_on_drop: false }`
[INFO] [stdout] 826b284a11f3a3ce510d103afd9841b7aa7f44af5e208cd76bf5227cb6609ede
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-03-05" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 19dce26035d46fb25f9658ce31108f4fc4e93730cb5eba93e0438da4236aadd5
[INFO] running `Command { std: "docker" "start" "-a" "19dce26035d46fb25f9658ce31108f4fc4e93730cb5eba93e0438da4236aadd5", kill_on_drop: false }`
[INFO] [stderr] warning: unused imports: `dealloc` and `ptr::NonNull`
[INFO] [stderr]  --> src/slab.rs:1:26
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::{alloc::{alloc, dealloc, Layout}, ops::DerefMut, ptr::NonNull};
[INFO] [stderr]   |                          ^^^^^^^                          ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cell::RefCell`
[INFO] [stderr]  --> src/slab.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::cell::RefCell;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]    --> src/slab.rs:114:6
[INFO] [stderr]     |
[INFO] [stderr] 114 |     };
[INFO] [stderr]     |      ^ help: remove this semicolon
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]    --> src/slab.rs:126:6
[INFO] [stderr]     |
[INFO] [stderr] 126 |     };
[INFO] [stderr]     |      ^ help: remove this semicolon
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]    --> src/slab.rs:148:54
[INFO] [stderr]     |
[INFO] [stderr] 148 |     struct C<'a, T> { a: T, b: Vec<T>, c: &'a mut T }; 
[INFO] [stderr]     |                                                      ^ help: remove this semicolon
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/slab.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |     let mut sa = SlabAllocator::<String>::init();
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/slab.rs:100:9
[INFO] [stderr]     |
[INFO] [stderr] 100 |     let mut init_string_box = sa.alloc(String::from("Bananas")).unwrap();
[INFO] [stderr]     |         ----^^^^^^^^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/slab.rs:115:9
[INFO] [stderr]     |
[INFO] [stderr] 115 |     let mut sa = SlabAllocator::<A>::init();
[INFO] [stderr]     |         ----^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/slab.rs:129:9
[INFO] [stderr]     |
[INFO] [stderr] 129 |     let mut sa = SlabAllocator::<B>::init(); 
[INFO] [stderr]     |         ----^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/slab.rs:131:9
[INFO] [stderr]     |
[INFO] [stderr] 131 |     for i in 0..sa.capacity {
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/slab.rs:149:9
[INFO] [stderr]     |
[INFO] [stderr] 149 |     let mut sa = SlabAllocator::<C<u32>>::init();
[INFO] [stderr]     |         ----^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/slab.rs:165:9
[INFO] [stderr]     |
[INFO] [stderr] 165 |     let mut sa = Arc::new(SlabAllocator::<i32>::init()); 
[INFO] [stderr]     |         ----^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut sa = SlabAllocator::<String>::init(); 
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sa`
[INFO] [stderr]   --> src/main.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut sa = SlabAllocator::<String>::init(); 
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sa`
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Node` is never used
[INFO] [stderr]  --> src/main.rs:7:6
[INFO] [stderr]   |
[INFO] [stderr] 7 | enum Node<K,V> {
[INFO] [stderr]   |      ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `x`, `y`, and `z` are never read
[INFO] [stderr]    --> src/slab.rs:111:9
[INFO] [stderr]     |
[INFO] [stderr] 110 |     struct A {
[INFO] [stderr]     |            - fields in this struct
[INFO] [stderr] 111 |         x: u32,
[INFO] [stderr]     |         ^
[INFO] [stderr] 112 |         y: u32,
[INFO] [stderr]     |         ^
[INFO] [stderr] 113 |         z: (i32, i32),
[INFO] [stderr]     |         ^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `x` and `y` are never read
[INFO] [stderr]    --> src/slab.rs:124:9
[INFO] [stderr]     |
[INFO] [stderr] 123 |     struct B {
[INFO] [stderr]     |            - fields in this struct
[INFO] [stderr] 124 |         x: u32,
[INFO] [stderr]     |         ^
[INFO] [stderr] 125 |         y: u32,
[INFO] [stderr]     |         ^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `a`, `b`, and `c` are never read
[INFO] [stderr]    --> src/slab.rs:148:23
[INFO] [stderr]     |
[INFO] [stderr] 148 |     struct C<'a, T> { a: T, b: Vec<T>, c: &'a mut T }; 
[INFO] [stderr]     |            -          ^     ^          ^
[INFO] [stderr]     |            |
[INFO] [stderr]     |            fields in this struct
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/slab.rs:74:18
[INFO] [stderr]    |
[INFO] [stderr] 74 |     pub fn alloc(&self, value: T) -> Option<SlabBox<T>>{
[INFO] [stderr]    |                  ^^^^^                      ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]    |                  |
[INFO] [stderr]    |                  the lifetime is elided here
[INFO] [stderr]    |
[INFO] [stderr]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]    |
[INFO] [stderr] 74 |     pub fn alloc(&self, value: T) -> Option<SlabBox<'_, T>>{
[INFO] [stderr]    |                                                     +++
[INFO] [stderr] 
[INFO] [stderr] warning: `btree-rs` (bin "btree-rs" test) generated 19 warnings (run `cargo fix --bin "btree-rs" -p btree-rs --tests` to apply 12 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/btree_rs-f0f1e05175363a5b)
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test slab::test_accounting ... ok
[INFO] [stdout] test slab::test_deref_coercsion ... ok
[INFO] [stdout] test slab::test_max_alloc ... ok
[INFO] [stdout] test slab::test_slab_allocator ... ok
[INFO] [stdout] test slab::test_threading ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.11s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "19dce26035d46fb25f9658ce31108f4fc4e93730cb5eba93e0438da4236aadd5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19dce26035d46fb25f9658ce31108f4fc4e93730cb5eba93e0438da4236aadd5", kill_on_drop: false }`
[INFO] [stdout] 19dce26035d46fb25f9658ce31108f4fc4e93730cb5eba93e0438da4236aadd5
