[INFO] cloning repository https://github.com/ibiscum/the-rust-programming-handbook
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ibiscum/the-rust-programming-handbook" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fibiscum%2Fthe-rust-programming-handbook", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 76d1db83a103e93e5195088fdce46a66203d3c57
[INFO] checking ibiscum/the-rust-programming-handbook against 3154cc1a3e6424e44f438a95007d043ed5ceaaf6+rustflags=-Znext-solver=coherence for pr-133502-30
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fibiscum%2Fthe-rust-programming-handbook" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
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[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ibiscum/the-rust-programming-handbook
[INFO] finished tweaking git repo https://github.com/ibiscum/the-rust-programming-handbook
[INFO] tweaked toml for git repo https://github.com/ibiscum/the-rust-programming-handbook written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ibiscum/the-rust-programming-handbook on toolchain 3154cc1a3e6424e44f438a95007d043ed5ceaaf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3154cc1a3e6424e44f438a95007d043ed5ceaaf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
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[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3154cc1a3e6424e44f438a95007d043ed5ceaaf6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "inspect" "85f1afcb477100ad5b75217f870f1762a03d511758d0c8832b4d742594dce6dd", kill_on_drop: false }`
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[INFO] [stderr]     Checking chapter_4_copy_trait v0.1.0 (/opt/rustwide/workdir/chapter-4/copy_trait)
[INFO] [stderr]     Checking chapter_4_pitfall_2 v0.1.0 (/opt/rustwide/workdir/chapter-4/pitfall_2)
[INFO] [stderr]     Checking chapter_7_06_duplication_problem v0.1.0 (/opt/rustwide/workdir/chapter-7/06_duplication_problem)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> chapter-4/pitfall_2/src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut write1 = &mut greeting; // Mutable borrow: Can modify `greeting`
[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] 
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[INFO] [stderr]     Checking chapter_17_17_23_excessive_dynamic_dispatch v0.1.0 (/opt/rustwide/workdir/chapter-17/17_23_excessive_dynamic_dispatch)
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> chapter-4/copy_trait/src/main.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let s2 = s1;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapter_1_shadowing v0.1.0 (/opt/rustwide/workdir/chapter-1/shadowing)
[INFO] [stdout] warning: variant `PageUnload` is never constructed
[INFO] [stdout]  --> chapter-5/enums_first_example/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum WebEvent {
[INFO] [stdout]   |      -------- variant in this enum
[INFO] [stdout] 3 |     PageLoad,
[INFO] [stdout] 4 |     PageUnload,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
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[INFO] [stderr]     Checking chapter_5_tuple_structs v0.1.0 (/opt/rustwide/workdir/chapter-5/tuple_structs)
[INFO] [stderr]     Checking chapter_2_for_nested v0.1.0 (/opt/rustwide/workdir/chapter-2/for_nested)
[INFO] [stderr]     Checking chapter_17_17_18_data_races v0.1.0 (/opt/rustwide/workdir/chapter-17/17_18_data_races)
[INFO] [stderr]     Checking chapter_9_01_manual_iteration v0.1.0 (/opt/rustwide/workdir/chapter-9/01_manual_iteration)
[INFO] [stderr]     Checking chapter_2_matching_literals v0.1.0 (/opt/rustwide/workdir/chapter-2/matching_literals)
[INFO] [stderr]    Compiling synstructure v0.13.2
[INFO] [stderr]     Checking chapter_2_structs_initialization v0.1.0 (/opt/rustwide/workdir/chapter-2/structs_initialization)
[INFO] [stderr]     Checking chapter_13_04_mutex_counter v0.1.0 (/opt/rustwide/workdir/chapter-13/04_mutex_counter)
[INFO] [stderr]     Checking chapter-14-tests v0.1.0 (/opt/rustwide/workdir/chapter-14-tests)
[INFO] [stderr]     Checking chapter_3_functions_immutable_borrowing v0.1.0 (/opt/rustwide/workdir/chapter-3/functions_immutable_borrowing)
[INFO] [stderr]     Checking chapter_4_lifetime_error v0.1.0 (/opt/rustwide/workdir/chapter-4/lifetime_error)
[INFO] [stdout] error[E0106]: missing lifetime specifier
[INFO] [stdout]  --> chapter-4/lifetime_error/src/main.rs:4:32
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn get_dangling_reference() -> &String {
[INFO] [stdout]   |                                ^ expected named lifetime parameter
[INFO] [stdout]   |
[INFO] [stdout]   = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
[INFO] [stdout] help: consider using the `'static` lifetime, but this is uncommon unless you're returning a borrowed value from a `const` or a `static`
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn get_dangling_reference() -> &'static String {
[INFO] [stdout]   |                                 +++++++
[INFO] [stdout] help: instead, you are more likely to want to return an owned value
[INFO] [stdout]   |
[INFO] [stdout] 4 - fn get_dangling_reference() -> &String {
[INFO] [stdout] 4 + fn get_dangling_reference() -> String {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking chapter_4_returning_ownership v0.1.0 (/opt/rustwide/workdir/chapter-4/returning_ownership)
[INFO] [stdout] For more information about this error, try `rustc --explain E0106`.
[INFO] [stdout] 
[INFO] [stderr]     Checking rustls-webpki v0.103.13
[INFO] [stderr] error: could not compile `chapter_4_lifetime_error` (bin "chapter_4_lifetime_error") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "85f1afcb477100ad5b75217f870f1762a03d511758d0c8832b4d742594dce6dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85f1afcb477100ad5b75217f870f1762a03d511758d0c8832b4d742594dce6dd", kill_on_drop: false }`
[INFO] [stdout] 85f1afcb477100ad5b75217f870f1762a03d511758d0c8832b4d742594dce6dd
