[INFO] cloning repository https://github.com/rektdeckard/rust-concepts
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rektdeckard/rust-concepts" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frektdeckard%2Frust-concepts", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frektdeckard%2Frust-concepts'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b3919b8ce65f6ae0483cbf3a0bcb08825818624e
[INFO] checking rektdeckard/rust-concepts against try#901d6c1c62d7c61e05469e996c297476078ee06b for pr-157082
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frektdeckard%2Frust-concepts" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/rektdeckard/rust-concepts
[INFO] finished tweaking git repo https://github.com/rektdeckard/rust-concepts
[INFO] tweaked toml for git repo https://github.com/rektdeckard/rust-concepts written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/rektdeckard/rust-concepts on toolchain 901d6c1c62d7c61e05469e996c297476078ee06b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+901d6c1c62d7c61e05469e996c297476078ee06b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/rektdeckard/rust-concepts 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" "+901d6c1c62d7c61e05469e996c297476078ee06b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3e793bdf10248eb2ddbd6b0faebed8155c11b4589982e2893733958d93e8d540" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 5b707cebb7125c0c7488aa57035c9758872eee8113648812bcbf0a1b02863267
[INFO] running `Command { std: "docker" "start" "5b707cebb7125c0c7488aa57035c9758872eee8113648812bcbf0a1b02863267", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "5b707cebb7125c0c7488aa57035c9758872eee8113648812bcbf0a1b02863267" "/opt/rustwide/cargo-home/bin/cargo" "+901d6c1c62d7c61e05469e996c297476078ee06b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b707cebb7125c0c7488aa57035c9758872eee8113648812bcbf0a1b02863267", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "5b707cebb7125c0c7488aa57035c9758872eee8113648812bcbf0a1b02863267" "/opt/rustwide/cargo-home/bin/cargo" "+901d6c1c62d7c61e05469e996c297476078ee06b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.82
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking minigrep v0.1.0 (/opt/rustwide/workdir/minigrep)
[INFO] [stderr]     Checking concurrency v0.1.0 (/opt/rustwide/workdir/concurrency)
[INFO] [stderr]     Checking linked-list v0.1.0 (/opt/rustwide/workdir/linked-list)
[INFO] [stderr]     Checking standard v0.1.0 (/opt/rustwide/workdir/standard)
[INFO] [stderr]     Checking smart-pointers v0.1.0 (/opt/rustwide/workdir/smart-pointers)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> smart-pointers/src/lib.rs:12:27
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<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] 12 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<'_, T> {
[INFO] [stdout]    |                                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `core_intrinsics`: intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rand_core-0.4.2/src/impls.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | use core::intrinsics::transmute;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: add `#![feature(core_intrinsics)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2026-05-28; consider upgrading it if it is out of date
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking vector v0.1.0 (/opt/rustwide/workdir/vector)
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]   --> smart-pointers/src/lib.rs:57:23
[INFO] [stdout]    |
[INFO] [stdout] 57 |             Cons(i32, Box<List>),
[INFO] [stdout]    |             ----      ^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 57 -             Cons(i32, Box<List>),
[INFO] [stdout] 57 +             Cons(i32, ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> smart-pointers/src/lib.rs:131:18
[INFO] [stdout]     |
[INFO] [stdout] 131 |             Cons(i32, Rc<RcList>),
[INFO] [stdout]     |             ---- ^^^  ^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             fields in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 131 -             Cons(i32, Rc<RcList>),
[INFO] [stdout] 131 +             Cons((), ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> smart-pointers/src/lib.rs:194:18
[INFO] [stdout]     |
[INFO] [stdout] 194 |             Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout]     |             ---- ^^^^^^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 194 -             Cons(Rc<RefCell<i32>>, Rc<List>),
[INFO] [stdout] 194 +             Cons((), ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> smart-pointers/src/lib.rs:217:18
[INFO] [stdout]     |
[INFO] [stdout] 217 |             Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout]     |             ---- ^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             field in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 217 -             Cons(i32, RefCell<Rc<List>>),
[INFO] [stdout] 217 +             Cons((), RefCell<Rc<List>>),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `value` and `children` are never read
[INFO] [stdout]    --> smart-pointers/src/lib.rs:258:13
[INFO] [stdout]     |
[INFO] [stdout] 257 |         struct Node {
[INFO] [stdout]     |                ---- fields in this struct
[INFO] [stdout] 258 |             value: i32,
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 259 |             parent: RefCell<Weak<Node>>,
[INFO] [stdout] 260 |             children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]     |             ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> smart-pointers/src/lib.rs:12:27
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<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] 12 |     pub fn new(messenger: &T, max: usize) -> LimitTracker<'_, T> {
[INFO] [stdout]    |                                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rand_core` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "5b707cebb7125c0c7488aa57035c9758872eee8113648812bcbf0a1b02863267", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b707cebb7125c0c7488aa57035c9758872eee8113648812bcbf0a1b02863267", kill_on_drop: false }`
[INFO] [stdout] 5b707cebb7125c0c7488aa57035c9758872eee8113648812bcbf0a1b02863267
