[INFO] cloning repository https://github.com/marisusis/rustconf2026-c-to-rust-workshop
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/marisusis/rustconf2026-c-to-rust-workshop" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarisusis%2Frustconf2026-c-to-rust-workshop", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarisusis%2Frustconf2026-c-to-rust-workshop'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c8151eec56b7bfb6c9f42e14bbd66fb4799ab8ab
[INFO] checking marisusis/rustconf2026-c-to-rust-workshop against 5c543b0b8c73c7b72bc8284ced4fb22ead15734d for pr-160186
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmarisusis%2Frustconf2026-c-to-rust-workshop" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-3-tc1/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/marisusis/rustconf2026-c-to-rust-workshop
[INFO] finished tweaking git repo https://github.com/marisusis/rustconf2026-c-to-rust-workshop
[INFO] tweaked toml for git repo https://github.com/marisusis/rustconf2026-c-to-rust-workshop written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/marisusis/rustconf2026-c-to-rust-workshop on toolchain 5c543b0b8c73c7b72bc8284ced4fb22ead15734d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5c543b0b8c73c7b72bc8284ced4fb22ead15734d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/marisusis/rustconf2026-c-to-rust-workshop 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" "+5c543b0b8c73c7b72bc8284ced4fb22ead15734d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: unused workspace dependency `cbindgen`
[INFO] [stderr]   --> Cargo.toml:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | cbindgen = "0.27"
[INFO] [stderr]    | ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `cargo::unused_workspace_dependencies` is set to `warn` by default
[INFO] [stderr] help: consider removing the workspace dependency `cbindgen`
[INFO] [stderr] warning: workspace (manifest) generated 1 warning
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded terminal_size v0.4.4
[INFO] [stderr]   Downloaded log v0.4.30
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 28b8731db973795d09420acb89fcc1437e48215dc7f903406f81ff0c0388ab92
[INFO] running `Command { std: "docker" "start" "28b8731db973795d09420acb89fcc1437e48215dc7f903406f81ff0c0388ab92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "28b8731db973795d09420acb89fcc1437e48215dc7f903406f81ff0c0388ab92", 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" "28b8731db973795d09420acb89fcc1437e48215dc7f903406f81ff0c0388ab92" "/opt/rustwide/cargo-home/bin/cargo" "+5c543b0b8c73c7b72bc8284ced4fb22ead15734d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "28b8731db973795d09420acb89fcc1437e48215dc7f903406f81ff0c0388ab92", 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" "28b8731db973795d09420acb89fcc1437e48215dc7f903406f81ff0c0388ab92" "/opt/rustwide/cargo-home/bin/cargo" "+5c543b0b8c73c7b72bc8284ced4fb22ead15734d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] warning: unused workspace dependency `cbindgen`
[INFO] [stderr]   --> Cargo.toml:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | cbindgen = "0.27"
[INFO] [stderr]    | ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `cargo::unused_workspace_dependencies` is set to `warn` by default
[INFO] [stderr] help: consider removing the workspace dependency `cbindgen`
[INFO] [stderr] warning: workspace (manifest) generated 1 warning
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling glob v0.3.3
[INFO] [stderr]    Compiling libc v0.2.186
[INFO] [stderr]    Compiling rustix v1.1.4
[INFO] [stderr]    Compiling prettyplease v0.2.37
[INFO] [stderr]    Compiling cc v1.2.65
[INFO] [stderr]    Compiling minimal-lexical v0.2.1
[INFO] [stderr]    Compiling regex-syntax v0.8.10
[INFO] [stderr]    Compiling memchr v2.8.1
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling clang-sys v1.8.1
[INFO] [stderr]    Compiling libloading v0.8.9
[INFO] [stderr]    Compiling bindgen v0.72.1
[INFO] [stderr]    Compiling either v1.16.0
[INFO] [stderr]    Compiling bitflags v2.11.1
[INFO] [stderr]    Compiling nom v7.1.3
[INFO] [stderr]    Compiling itertools v0.13.0
[INFO] [stderr]    Compiling log v0.4.30
[INFO] [stderr]     Checking terminal_size v0.4.4
[INFO] [stderr]    Compiling rustc-hash v2.1.2
[INFO] [stderr]     Checking clap_builder v4.6.6
[INFO] [stderr]     Checking regex-lite v0.1.9
[INFO] [stderr]     Checking condtype v1.3.0
[INFO] [stderr]     Checking bm_high_quality_ffi_apis v0.1.0 (/opt/rustwide/workdir/exercises/01_intro/07_high_quality_ffi_apis)
[INFO] [stderr]     Checking bm_validate_and_narrow v0.1.0 (/opt/rustwide/workdir/exercises/01_intro/06_validate_and_narrow)
[INFO] [stdout] warning: unused import: `CString`
[INFO] [stdout]  --> exercises/01_intro/06_validate_and_narrow/src/lib.rs:2:25
[INFO] [stdout]   |
[INFO] [stdout] 2 |     ffi::{c_char, CStr, CString},
[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: `out_len`
[INFO] [stdout]   --> exercises/01_intro/06_validate_and_narrow/src/lib.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     out_len: usize,
[INFO] [stdout]    |     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_out_len`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking bm_clippy_lints v0.1.0 (/opt/rustwide/workdir/exercises/02_intermediate/04_clippy_lints)
[INFO] [stderr]    Compiling bm_lldb_gdb v0.1.0 (/opt/rustwide/workdir/exercises/02_intermediate/03_lldb_gdb)
[INFO] [stderr]    Compiling regex-automata v0.4.14
[INFO] [stderr]    Compiling bm_benchmarking v0.1.0 (/opt/rustwide/workdir/exercises/02_intermediate/07_benchmarking)
[INFO] [stderr]    Compiling bm_drift v0.1.0 (/opt/rustwide/workdir/exercises/01_intro/02_drift)
[INFO] [stderr]    Compiling bm_allocators v0.1.0 (/opt/rustwide/workdir/exercises/02_intermediate/02_allocators)
[INFO] [stderr]    Compiling bm_miri v0.1.0 (/opt/rustwide/workdir/exercises/02_intermediate/06_miri)
[INFO] [stderr]    Compiling bm_what_is_ffi v0.1.0 (/opt/rustwide/workdir/exercises/01_intro/01_what_is_ffi)
[INFO] [stdout] warning: unused variable: `url`
[INFO] [stdout]   --> exercises/02_intermediate/07_benchmarking/src/lib.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     url: Option<NonNull<c_char>>,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_url`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `out`
[INFO] [stdout]   --> exercises/02_intermediate/07_benchmarking/src/lib.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     out: Option<NonNull<c_char>>,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_out`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `out_len`
[INFO] [stdout]   --> exercises/02_intermediate/07_benchmarking/src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     out_len: usize,
[INFO] [stdout]    |     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_out_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bm_add` is never used
[INFO] [stdout]  --> exercises/01_intro/02_drift/src/lib.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn bm_add(a: c_int, b: c_int) -> c_int;
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]   --> exercises/02_intermediate/02_allocators/src/use_c_allocator_from_rust.rs:14:16
[INFO] [stdout]    |
[INFO] [stdout] 14 | use std::ptr::{self, NonNull};
[INFO] [stdout]    |                ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking bm_ffi_safe_types v0.1.0 (/opt/rustwide/workdir/exercises/01_intro/05_ffi_safe_types)
[INFO] [stdout] warning: unused import: `c_str`
[INFO] [stdout]  --> exercises/01_intro/05_ffi_safe_types/src/lib.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::ffi::{c_char, c_str};
[INFO] [stdout]   |                        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking bm_cheadergen v0.1.0 (/opt/rustwide/workdir/exercises/01_intro/04_cheadergen)
[INFO] [stdout] warning: unused import: `CString`
[INFO] [stdout]  --> exercises/01_intro/06_validate_and_narrow/src/lib.rs:2:25
[INFO] [stdout]   |
[INFO] [stdout] 2 |     ffi::{c_char, CStr, CString},
[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: `out_len`
[INFO] [stdout]   --> exercises/01_intro/06_validate_and_narrow/src/lib.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     out_len: usize,
[INFO] [stdout]    |     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_out_len`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `c_str`
[INFO] [stdout]  --> exercises/01_intro/05_ffi_safe_types/src/lib.rs:1:24
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::ffi::{c_char, c_str};
[INFO] [stdout]   |                        ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling cexpr v0.6.0
[INFO] [stderr]     Checking clap v4.6.6
[INFO] [stderr]    Compiling regex v1.12.3
[INFO] [stderr]    Compiling divan-macros v0.1.21
[INFO] [stderr]     Checking divan v0.1.21
[INFO] [stdout] warning: unused import: `std::ptr::NonNull`
[INFO] [stdout]  --> exercises/02_intermediate/07_benchmarking/benches/normalize.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::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: `bm_normalize_url_rust`
[INFO] [stdout]  --> exercises/02_intermediate/07_benchmarking/benches/normalize.rs:4:33
[INFO] [stdout]   |
[INFO] [stdout] 4 | use bm_benchmarking::{BmResult, bm_normalize_url_rust};
[INFO] [stdout]   |                                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `url`
[INFO] [stdout]   --> exercises/02_intermediate/07_benchmarking/src/lib.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     url: Option<NonNull<c_char>>,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_url`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `out`
[INFO] [stdout]   --> exercises/02_intermediate/07_benchmarking/src/lib.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     out: Option<NonNull<c_char>>,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_out`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `out_len`
[INFO] [stdout]   --> exercises/02_intermediate/07_benchmarking/src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     out_len: usize,
[INFO] [stdout]    |     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_out_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling bm_bindgen v0.1.0 (/opt/rustwide/workdir/exercises/01_intro/03_bindgen)
[INFO] [stdout] warning: function `bm_add` is never used
[INFO] [stdout]  --> /opt/rustwide/target/debug/build/bm_bindgen/7563b8704deac792/out/bindings.rs:3:28
[INFO] [stdout]   |
[INFO] [stdout] 3 | unsafe extern "C" { pub fn bm_add (a : :: std :: os :: raw :: c_int , b : :: std :: os :: raw :: c_int) -> :: std :: os :: raw :: c_i...
[INFO] [stdout]   |                            ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 44.55s
[INFO] running `Command { std: "docker" "inspect" "28b8731db973795d09420acb89fcc1437e48215dc7f903406f81ff0c0388ab92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28b8731db973795d09420acb89fcc1437e48215dc7f903406f81ff0c0388ab92", kill_on_drop: false }`
[INFO] [stdout] 28b8731db973795d09420acb89fcc1437e48215dc7f903406f81ff0c0388ab92
