[INFO] cloning repository https://github.com/h2oche/fun-with-semirings
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/h2oche/fun-with-semirings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fh2oche%2Ffun-with-semirings", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fh2oche%2Ffun-with-semirings'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a801df28762acc2906b1337cb8df6a8f957095e1
[INFO] testing h2oche/fun-with-semirings 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%2Fh2oche%2Ffun-with-semirings" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/h2oche/fun-with-semirings
[INFO] finished tweaking git repo https://github.com/h2oche/fun-with-semirings
[INFO] tweaked toml for git repo https://github.com/h2oche/fun-with-semirings written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/h2oche/fun-with-semirings 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/h2oche/fun-with-semirings 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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_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" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3238d20a7e3cdaff9e517415dbbfc13de4ea19c3cb076253ca5b10e734a1dad8
[INFO] running `Command { std: "docker" "start" "-a" "3238d20a7e3cdaff9e517415dbbfc13de4ea19c3cb076253ca5b10e734a1dad8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3238d20a7e3cdaff9e517415dbbfc13de4ea19c3cb076253ca5b10e734a1dad8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3238d20a7e3cdaff9e517415dbbfc13de4ea19c3cb076253ca5b10e734a1dad8", kill_on_drop: false }`
[INFO] [stdout] 3238d20a7e3cdaff9e517415dbbfc13de4ea19c3cb076253ca5b10e734a1dad8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 9ceab0700d98d76179e79f7102d900bbf749cd7d660a0e4addf839774b0d2725
[INFO] running `Command { std: "docker" "start" "-a" "9ceab0700d98d76179e79f7102d900bbf749cd7d660a0e4addf839774b0d2725", kill_on_drop: false }`
[INFO] [stderr]    Compiling fun-with-semirings v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `s` is never used
[INFO] [stdout]    --> src/main.rs:144:8
[INFO] [stdout]     |
[INFO] [stdout] 144 |     fn s(n: usize) -> Dom {
[INFO] [stdout]     |        ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout]  7 | fn main() {
[INFO] [stdout]    | --------- move the `impl` block outside of this function `main`
[INFO] [stdout] ...
[INFO] [stdout] 12 |     impl Semiring for bool {
[INFO] [stdout]    |     ^^^^^--------^^^^^^^^^
[INFO] [stdout]    |          |
[INFO] [stdout]    |          `Semiring` is not local
[INFO] [stdout]    |
[INFO] [stdout]    = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stdout]    = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout]  7 | fn main() {
[INFO] [stdout]    | --------- move the `impl` block outside of this function `main`
[INFO] [stdout] ...
[INFO] [stdout] 26 |     impl ClosedSemiring for bool {
[INFO] [stdout]    |     ^^^^^--------------^^^^^^^^^
[INFO] [stdout]    |          |
[INFO] [stdout]    |          `ClosedSemiring` is not local
[INFO] [stdout]    |
[INFO] [stdout]    = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `M` should have a snake case name
[INFO] [stdout]    --> src/main.rs:234:9
[INFO] [stdout]     |
[INFO] [stdout] 234 |     let M = Matrix::Raw(vec![
[INFO] [stdout]     |         ^ help: convert the identifier to snake case: `m`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.16s
[INFO] running `Command { std: "docker" "inspect" "9ceab0700d98d76179e79f7102d900bbf749cd7d660a0e4addf839774b0d2725", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ceab0700d98d76179e79f7102d900bbf749cd7d660a0e4addf839774b0d2725", kill_on_drop: false }`
[INFO] [stdout] 9ceab0700d98d76179e79f7102d900bbf749cd7d660a0e4addf839774b0d2725
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a42f1e508d85de87e46a2eabb34e4c80eec0fd168dce6ada7196be208fbbe1ce
[INFO] running `Command { std: "docker" "start" "-a" "a42f1e508d85de87e46a2eabb34e4c80eec0fd168dce6ada7196be208fbbe1ce", kill_on_drop: false }`
[INFO] [stderr]    Compiling fun-with-semirings v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stdout]   --> src/main.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout]  7 | fn main() {
[INFO] [stdout]    | --------- move the `impl` block outside of this function `main`
[INFO] [stdout] ...
[INFO] [stdout] 12 |     impl Semiring for bool {
[INFO] [stdout]    |     ^^^^^--------^^^^^^^^^
[INFO] [stdout]    |          |
[INFO] [stdout]    |          `Semiring` is not local
[INFO] [stdout]    |
[INFO] [stdout]    = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stdout]    = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stdout]   --> src/main.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout]  7 | fn main() {
[INFO] [stdout]    | --------- move the `impl` block outside of this function `main`
[INFO] [stdout] ...
[INFO] [stdout] 26 |     impl ClosedSemiring for bool {
[INFO] [stdout]    |     ^^^^^--------------^^^^^^^^^
[INFO] [stdout]    |          |
[INFO] [stdout]    |          `ClosedSemiring` is not local
[INFO] [stdout]    |
[INFO] [stdout]    = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `M` should have a snake case name
[INFO] [stdout]    --> src/main.rs:234:9
[INFO] [stdout]     |
[INFO] [stdout] 234 |     let M = Matrix::Raw(vec![
[INFO] [stdout]     |         ^ help: convert the identifier to snake case: `m`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `Command { std: "docker" "inspect" "a42f1e508d85de87e46a2eabb34e4c80eec0fd168dce6ada7196be208fbbe1ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a42f1e508d85de87e46a2eabb34e4c80eec0fd168dce6ada7196be208fbbe1ce", kill_on_drop: false }`
[INFO] [stdout] a42f1e508d85de87e46a2eabb34e4c80eec0fd168dce6ada7196be208fbbe1ce
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6debcc1819793e551afb8f69da257000889a662b8447f4b7f5221a98d3b7a99e
[INFO] running `Command { std: "docker" "start" "-a" "6debcc1819793e551afb8f69da257000889a662b8447f4b7f5221a98d3b7a99e", kill_on_drop: false }`
[INFO] [stderr] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stderr]   --> src/main.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr]  7 | fn main() {
[INFO] [stderr]    | --------- move the `impl` block outside of this function `main`
[INFO] [stderr] ...
[INFO] [stderr] 12 |     impl Semiring for bool {
[INFO] [stderr]    |     ^^^^^--------^^^^^^^^^
[INFO] [stderr]    |          |
[INFO] [stderr]    |          `Semiring` is not local
[INFO] [stderr]    |
[INFO] [stderr]    = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stderr]    = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stderr]   --> src/main.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr]  7 | fn main() {
[INFO] [stderr]    | --------- move the `impl` block outside of this function `main`
[INFO] [stderr] ...
[INFO] [stderr] 26 |     impl ClosedSemiring for bool {
[INFO] [stderr]    |     ^^^^^--------------^^^^^^^^^
[INFO] [stderr]    |          |
[INFO] [stderr]    |          `ClosedSemiring` is not local
[INFO] [stderr]    |
[INFO] [stderr]    = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `M` should have a snake case name
[INFO] [stderr]    --> src/main.rs:234:9
[INFO] [stderr]     |
[INFO] [stderr] 234 |     let M = Matrix::Raw(vec![
[INFO] [stderr]     |         ^ help: convert the identifier to snake case: `m`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `fun-with-semirings` (bin "fun-with-semirings" test) generated 3 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/fun_with_semirings-60339d46d0d1d258)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "6debcc1819793e551afb8f69da257000889a662b8447f4b7f5221a98d3b7a99e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6debcc1819793e551afb8f69da257000889a662b8447f4b7f5221a98d3b7a99e", kill_on_drop: false }`
[INFO] [stdout] 6debcc1819793e551afb8f69da257000889a662b8447f4b7f5221a98d3b7a99e
