[INFO] cloning repository https://github.com/mhashimm/100-exercises-to-learn-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mhashimm/100-exercises-to-learn-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmhashimm%2F100-exercises-to-learn-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmhashimm%2F100-exercises-to-learn-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8791feb495a96e11b84fe6445ced2c12fe5d549a
[INFO] testing mhashimm/100-exercises-to-learn-rust against beta-2026-04-21 for beta-1.96-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmhashimm%2F100-exercises-to-learn-rust" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
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[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/mhashimm/100-exercises-to-learn-rust
[INFO] finished tweaking git repo https://github.com/mhashimm/100-exercises-to-learn-rust
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[INFO] validating manifest of git repo https://github.com/mhashimm/100-exercises-to-learn-rust on toolchain beta-2026-04-21
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[INFO] crate git repo https://github.com/mhashimm/100-exercises-to-learn-rust 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 }`
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[INFO] [stderr]    Compiling leaking v0.1.0 (/opt/rustwide/workdir/exercises/07_threads/03_leak)
[INFO] [stderr]    Compiling intro_07 v0.1.0 (/opt/rustwide/workdir/exercises/07_threads/00_intro)
[INFO] [stderr]    Compiling mut_slice v0.1.0 (/opt/rustwide/workdir/exercises/06_ticket_management/11_mutable_slices)
[INFO] [stderr]    Compiling sized v0.1.0 (/opt/rustwide/workdir/exercises/04_traits/08_sized)
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> exercises/07_threads/03_leak/src/lib.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::thread;
[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 variable: `v`
[INFO] [stdout]  --> exercises/07_threads/03_leak/src/lib.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn sum(v: Vec<i32>) -> i32 {
[INFO] [stdout]   |            ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the size for values of type `str` cannot be known at compilation time
[INFO] [stdout]  --> exercises/04_traits/08_sized/src/lib.rs:6:25
[INFO] [stdout]   |
[INFO] [stdout] 6 |     std::mem::size_of::<str>();
[INFO] [stdout]   |                         ^^^ doesn't have a size known at compile-time
[INFO] [stdout]   |
[INFO] [stdout]   = help: the trait `Sized` is not implemented for `str`
[INFO] [stdout] note: required by an implicit `Sized` bound in `std::mem::size_of`
[INFO] [stdout]  --> /rustc/8489f1adbe1c8f8921cf18b9962cf565237a5489/library/core/src/mem/mod.rs:372:0
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `intro` is never used
[INFO] [stdout]  --> exercises/07_threads/00_intro/src/lib.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn intro() -> &'static str {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sized` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
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[INFO] [stdout] 772c6f76bce96bc5d36f5a67647eb318a6058b2ac721eb03f7115659ebcf89b7
