[INFO] cloning repository https://github.com/castamos/learn_rust_by_testing [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/castamos/learn_rust_by_testing" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcastamos%2Flearn_rust_by_testing", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcastamos%2Flearn_rust_by_testing'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 587cd9e21f2869191e85c687daf24781beec057a [INFO] testing castamos/learn_rust_by_testing against beta-2026-03-05 for beta-1.95-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcastamos%2Flearn_rust_by_testing" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/castamos/learn_rust_by_testing [INFO] finished tweaking git repo https://github.com/castamos/learn_rust_by_testing [INFO] tweaked toml for git repo https://github.com/castamos/learn_rust_by_testing written to /workspace/builds/worker-4-tc2/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/castamos/learn_rust_by_testing on toolchain beta-2026-03-05 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-03-05" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/castamos/learn_rust_by_testing 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-2026-03-05" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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-2026-03-05" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 4c2f0c7c0e001b336f3292b974c143d086f97fc02278f4a223faf1f77fc6e6b4 [INFO] running `Command { std: "docker" "start" "-a" "4c2f0c7c0e001b336f3292b974c143d086f97fc02278f4a223faf1f77fc6e6b4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "4c2f0c7c0e001b336f3292b974c143d086f97fc02278f4a223faf1f77fc6e6b4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "4c2f0c7c0e001b336f3292b974c143d086f97fc02278f4a223faf1f77fc6e6b4", kill_on_drop: false }` [INFO] [stdout] 4c2f0c7c0e001b336f3292b974c143d086f97fc02278f4a223faf1f77fc6e6b4 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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-2026-03-05" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] c78558697d3cc4ad133e8d8068c6bf2aaee81542fd5cd2f824cde0d8789f02b7 [INFO] running `Command { std: "docker" "start" "-a" "c78558697d3cc4ad133e8d8068c6bf2aaee81542fd5cd2f824cde0d8789f02b7", kill_on_drop: false }` [INFO] [stderr] Compiling rust_by_test v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.04s [INFO] running `Command { std: "docker" "inspect" "c78558697d3cc4ad133e8d8068c6bf2aaee81542fd5cd2f824cde0d8789f02b7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c78558697d3cc4ad133e8d8068c6bf2aaee81542fd5cd2f824cde0d8789f02b7", kill_on_drop: false }` [INFO] [stdout] c78558697d3cc4ad133e8d8068c6bf2aaee81542fd5cd2f824cde0d8789f02b7 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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-2026-03-05" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 38998fcbf971904433ef02f32ed000f4fd34a9b4228d5e039c4a32635e01ee09 [INFO] running `Command { std: "docker" "start" "-a" "38998fcbf971904433ef02f32ed000f4fd34a9b4228d5e039c4a32635e01ee09", kill_on_drop: false }` [INFO] [stderr] Compiling rust_by_test v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: fields `0` and `1` are never read [INFO] [stdout] --> tests/interior-mutability.rs:157:14 [INFO] [stdout] | [INFO] [stdout] 157 | Cons(Rc>, Rc), [INFO] [stdout] | ---- ^^^^^^^^^^^^^^^^ ^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields [INFO] [stdout] | [INFO] [stdout] 157 - Cons(Rc>, Rc), [INFO] [stdout] 157 + Cons((), ()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `test` profile [unoptimized + debuginfo] target(s) in 0.45s [INFO] running `Command { std: "docker" "inspect" "38998fcbf971904433ef02f32ed000f4fd34a9b4228d5e039c4a32635e01ee09", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "38998fcbf971904433ef02f32ed000f4fd34a9b4228d5e039c4a32635e01ee09", kill_on_drop: false }` [INFO] [stdout] 38998fcbf971904433ef02f32ed000f4fd34a9b4228d5e039c4a32635e01ee09 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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-2026-03-05" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 4e261e9aa79d413cf5bc311f5f15f632d9922f66f0f74fd4a373f4cc41d34365 [INFO] running `Command { std: "docker" "start" "-a" "4e261e9aa79d413cf5bc311f5f15f632d9922f66f0f74fd4a373f4cc41d34365", kill_on_drop: false }` [INFO] [stderr] warning: fields `0` and `1` are never read [INFO] [stderr] --> tests/interior-mutability.rs:157:14 [INFO] [stderr] | [INFO] [stderr] 157 | Cons(Rc>, Rc), [INFO] [stderr] | ---- ^^^^^^^^^^^^^^^^ ^^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | fields in this variant [INFO] [stderr] | [INFO] [stderr] = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stderr] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields [INFO] [stderr] | [INFO] [stderr] 157 - Cons(Rc>, Rc), [INFO] [stderr] 157 + Cons((), ()), [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: `rust_by_test` (test "interior-mutability") generated 1 warning [INFO] [stderr] Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s [INFO] [stderr] Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/rust_by_test-a0660ed32a80adae) [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] [stdout] [INFO] [stdout] running 4 tests [INFO] [stdout] test test_interior_mutability::it_mutates_internal_field_through_immutable_ref ... ok [INFO] [stdout] test test_multiple_interior_mutability::it_makes_multiple_refs ... ok [INFO] [stdout] test test_refcell::it_allows_modification_of_immutable_ref ... ok [INFO] [stderr] Running tests/interior-mutability.rs (/opt/rustwide/target/debug/deps/interior_mutability-5fe8207ff9dd8b01) [INFO] [stderr] Running tests/references.rs (/opt/rustwide/target/debug/deps/references-1e4f832c78049a22) [INFO] [stdout] test test_refcell::it_panics_on_borrowing_a_mutable_borrow - should panic ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 13 tests [INFO] [stdout] test test_references::dereference_box ... ok [INFO] [stdout] test test_references::modify_value_through_reference ... ok [INFO] [stdout] test test_references::move_non_copy_value_to_box ... ok [INFO] [stdout] test test_user_defined_deref::dereference_user_defined_pointer ... ok [INFO] [stdout] test test_user_defined_deref::immutable_reference_explicit_coercion ... ok [INFO] [stdout] test test_user_defined_deref::immutable_reference_implicit_coercion ... ok [INFO] [stdout] test test_user_defined_deref::method_call_implicit_coercion_ ... ok [INFO] [stdout] test test_user_defined_deref::mutable_reference_explicit_coercion ... ok [INFO] [stdout] test test_user_defined_deref::mutable_reference_implicit_coercion ... ok [INFO] [stdout] test test_user_defined_deref::mutable_to_immutable_coercion ... ok [INFO] [stdout] test test_references::dereference_reference ... ok [INFO] [stdout] test test_references::modify_boxed_value_by_reference ... ok [INFO] [stdout] test test_references::modify_boxed_value ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s [INFO] [stdout] [INFO] [stderr] Running tests/structs.rs (/opt/rustwide/target/debug/deps/structs-6f42ce3848999d87) [INFO] [stdout] [INFO] [stdout] running 1 test [INFO] [stderr] Running tests/type-inference.rs (/opt/rustwide/target/debug/deps/type_inference-53ac77d73697cbaa) [INFO] [stdout] test test_structs::tuple_struct_as_type_alias ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 2 tests [INFO] [stdout] test test_basic_type_inference::integer ... ok [INFO] [stdout] test test_basic_type_inference::float ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stderr] Doc-tests rust_by_test [INFO] [stdout] [INFO] [stdout] running 2 tests [INFO] [stdout] test src/lib.rs - __doc_test_compile_fail (line 21) - compile fail ... ok [INFO] [stdout] test src/lib.rs - __doc_test_should_panic (line 42) ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.29s [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "4e261e9aa79d413cf5bc311f5f15f632d9922f66f0f74fd4a373f4cc41d34365", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "4e261e9aa79d413cf5bc311f5f15f632d9922f66f0f74fd4a373f4cc41d34365", kill_on_drop: false }` [INFO] [stdout] 4e261e9aa79d413cf5bc311f5f15f632d9922f66f0f74fd4a373f4cc41d34365