[INFO] cloning repository https://github.com/kellerflint/rust-exercises [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kellerflint/rust-exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkellerflint%2Frust-exercises", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkellerflint%2Frust-exercises'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] d78b8267d16dc78e707292e4be06c1fef2aabc94 [INFO] testing kellerflint/rust-exercises against beta-2026-04-21 for beta-1.96-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkellerflint%2Frust-exercises" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/kellerflint/rust-exercises [INFO] finished tweaking git repo https://github.com/kellerflint/rust-exercises [INFO] tweaked toml for git repo https://github.com/kellerflint/rust-exercises written to /workspace/builds/worker-5-tc2/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/kellerflint/rust-exercises on toolchain beta-2026-04-21 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/kellerflint/rust-exercises 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-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Updating crates.io index [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Downloading crates ... 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[stdout] 146afbe462d5af405ca5a0e78e8fa536502ca980411695b025a7a83f9d2a6f34 [INFO] running `Command { std: "docker" "start" "-a" "146afbe462d5af405ca5a0e78e8fa536502ca980411695b025a7a83f9d2a6f34", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "146afbe462d5af405ca5a0e78e8fa536502ca980411695b025a7a83f9d2a6f34", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "146afbe462d5af405ca5a0e78e8fa536502ca980411695b025a7a83f9d2a6f34", kill_on_drop: false }` [INFO] [stdout] 146afbe462d5af405ca5a0e78e8fa536502ca980411695b025a7a83f9d2a6f34 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 1931d5890c3484ab52c2e79cc85b913bf8739a403a637b6fcecfd8aa8a0d2745 [INFO] running `Command { std: "docker" "start" "-a" "1931d5890c3484ab52c2e79cc85b913bf8739a403a637b6fcecfd8aa8a0d2745", kill_on_drop: false }` [INFO] [stderr] Compiling thiserror v1.0.63 [INFO] [stderr] Compiling smallvec v1.13.2 [INFO] [stderr] Compiling libc v0.2.155 [INFO] [stderr] Compiling bytes 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Compiling phf_codegen v0.11.2 [INFO] [stderr] Compiling clap_derive v4.5.13 [INFO] [stderr] Compiling tungstenite v0.21.0 [INFO] [stderr] Compiling pin-project-internal v1.1.5 [INFO] [stderr] Compiling markup5ever v0.12.1 [INFO] [stderr] Compiling pest_meta v2.7.11 [INFO] [stderr] Compiling notify-debouncer-mini v0.4.1 [INFO] [stderr] Compiling semver v1.0.23 [INFO] [stderr] Compiling tempfile v3.11.0 [INFO] [stderr] Compiling pulldown-cmark v0.11.0 [INFO] [stderr] Compiling shlex v1.3.0 [INFO] [stderr] Compiling pin-project v1.1.5 [INFO] [stderr] Compiling pathdiff v0.2.1 [INFO] [stderr] Compiling topological-sort v0.2.2 [INFO] [stderr] Compiling pulldown-cmark-escape v0.11.0 [INFO] [stderr] Compiling itertools v0.13.0 [INFO] [stderr] Compiling pest_generator v2.7.11 [INFO] [stderr] Compiling client v0.1.0 (/opt/rustwide/workdir/exercises/07_threads/08_client) [INFO] [stdout] warning: unused variable: `draft` [INFO] [stdout] --> exercises/07_threads/08_client/src/lib.rs:14:26 [INFO] [stdout] | [INFO] [stdout] 14 | pub fn insert(&self, draft: TicketDraft) -> TicketId { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_draft` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `id` [INFO] [stdout] --> exercises/07_threads/08_client/src/lib.rs:18:23 [INFO] [stdout] | [INFO] [stdout] 18 | pub fn get(&self, id: TicketId) -> Option { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_id` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sender` [INFO] [stdout] --> exercises/07_threads/08_client/src/lib.rs:24:10 [INFO] [stdout] | [INFO] [stdout] 24 | let (sender, receiver) = std::sync::mpsc::channel(); [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_sender` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Insert` and `Get` are never constructed [INFO] [stdout] --> exercises/07_threads/08_client/src/lib.rs:31:5 [INFO] [stdout] | [INFO] [stdout] 30 | enum Command { [INFO] [stdout] | ------- variants in this enum [INFO] [stdout] 31 | Insert { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 35 | Get { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Compiling clap v4.5.13 [INFO] [stderr] Compiling clap_complete v4.5.12 [INFO] [stderr] Compiling index v0.1.0 (/opt/rustwide/workdir/exercises/06_ticket_management/13_index) [INFO] [stderr] Compiling btreemap v0.1.0 (/opt/rustwide/workdir/exercises/06_ticket_management/16_btreemap) [INFO] [stdout] warning: unreachable expression [INFO] [stdout] --> exercises/06_ticket_management/16_btreemap/src/lib.rs:44:22 [INFO] [stdout] | [INFO] [stdout] 43 | tickets: todo!(), [INFO] [stdout] | ------- any code following this expression is unreachable [INFO] [stdout] 44 | counter: 0, [INFO] [stdout] | ^ unreachable expression [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unreachable expression [INFO] [stdout] --> exercises/06_ticket_management/16_btreemap/src/lib.rs:58:9 [INFO] [stdout] | [INFO] [stdout] 57 | todo!(); [INFO] [stdout] | ------- any code following this expression is unreachable [INFO] [stdout] 58 | id [INFO] [stdout] | ^^ unreachable expression [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `ticket` [INFO] [stdout] --> exercises/06_ticket_management/16_btreemap/src/lib.rs:51:13 [INFO] [stdout] | [INFO] [stdout] 51 | let ticket = Ticket { [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_ticket` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `id` [INFO] [stdout] --> exercises/06_ticket_management/16_btreemap/src/lib.rs:61:23 [INFO] [stdout] | [INFO] [stdout] 61 | pub fn get(&self, id: TicketId) -> Option<&Ticket> { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_id` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `id` [INFO] [stdout] --> exercises/06_ticket_management/16_btreemap/src/lib.rs:65:31 [INFO] [stdout] | [INFO] [stdout] 65 | pub fn get_mut(&mut self, id: TicketId) -> Option<&mut Ticket> { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_id` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `tickets` is never read [INFO] [stdout] --> exercises/06_ticket_management/16_btreemap/src/lib.rs:12:5 [INFO] [stdout] | [INFO] [stdout] 11 | pub struct TicketStore { [INFO] [stdout] | ----------- field in this struct [INFO] [stdout] 12 | tickets: BTreeMap, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `TicketStore` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Compiling impl_trait_2 v0.1.0 (/opt/rustwide/workdir/exercises/06_ticket_management/09_impl_trait_2) [INFO] [stderr] Compiling channels v0.1.0 (/opt/rustwide/workdir/exercises/07_threads/05_channels) [INFO] [stderr] Compiling hashmap v0.1.0 (/opt/rustwide/workdir/exercises/06_ticket_management/15_hashmap) [INFO] [stdout] error: expected type, found `"not yet implemented"` [INFO] [stdout] --> exercises/07_threads/05_channels/src/lib.rs:7:12 [INFO] [stdout] | [INFO] [stdout] 7 | Insert(todo!()), [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | expected type [INFO] [stdout] | in this macro invocation [INFO] [stdout] | this macro call doesn't expand to a type [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Compiling pest_derive v2.7.11 [INFO] [stdout] warning: unused variable: `receiver` [INFO] [stdout] --> exercises/07_threads/05_channels/src/lib.rs:23:15 [INFO] [stdout] | [INFO] [stdout] 23 | pub fn server(receiver: Receiver) {} [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_receiver` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unreachable expression [INFO] [stdout] --> exercises/06_ticket_management/15_hashmap/src/lib.rs:42:22 [INFO] [stdout] | [INFO] [stdout] 41 | tickets: todo!(), [INFO] [stdout] | ------- any code following this expression is unreachable [INFO] [stdout] 42 | counter: 0, [INFO] [stdout] | ^ unreachable expression [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unreachable expression [INFO] [stdout] --> exercises/06_ticket_management/15_hashmap/src/lib.rs:56:9 [INFO] [stdout] | [INFO] [stdout] 55 | todo!(); [INFO] [stdout] | ------- any code following this expression is unreachable [INFO] [stdout] 56 | id [INFO] [stdout] | ^^ unreachable expression [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `channels` (lib) due to 1 previous error; 1 warning emitted [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] warning: unused variable: `ticket` [INFO] [stdout] --> exercises/06_ticket_management/15_hashmap/src/lib.rs:49:13 [INFO] [stdout] | [INFO] [stdout] 49 | let ticket = Ticket { [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_ticket` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `id` [INFO] [stdout] --> exercises/06_ticket_management/15_hashmap/src/lib.rs:59:23 [INFO] [stdout] | [INFO] [stdout] 59 | pub fn get(&self, id: TicketId) -> Option<&Ticket> { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_id` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `id` [INFO] [stdout] --> exercises/06_ticket_management/15_hashmap/src/lib.rs:63:31 [INFO] [stdout] | [INFO] [stdout] 63 | pub fn get_mut(&mut self, id: TicketId) -> Option<&mut Ticket> { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_id` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `tickets` is never read [INFO] [stdout] --> exercises/06_ticket_management/15_hashmap/src/lib.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 9 | pub struct TicketStore { [INFO] [stdout] | ----------- field in this struct [INFO] [stdout] 10 | tickets: HashMap, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `TicketStore` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "1931d5890c3484ab52c2e79cc85b913bf8739a403a637b6fcecfd8aa8a0d2745", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1931d5890c3484ab52c2e79cc85b913bf8739a403a637b6fcecfd8aa8a0d2745", kill_on_drop: false }` [INFO] [stdout] 1931d5890c3484ab52c2e79cc85b913bf8739a403a637b6fcecfd8aa8a0d2745