[INFO] fetching crate libstrawberry 1.4.3...
[INFO] testing libstrawberry-1.4.3 against beta-2026-01-20 for beta-1.94-1
[INFO] extracting crate libstrawberry 1.4.3 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate libstrawberry 1.4.3
[INFO] finished tweaking crates.io crate libstrawberry 1.4.3
[INFO] tweaked toml for crates.io crate libstrawberry 1.4.3 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate libstrawberry 1.4.3 on toolchain beta-2026-01-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-01-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate libstrawberry 1.4.3 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-2026-01-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 947c973efbf30fa84362178302cb8e366dfb38f2ba63a73443e73f20ce0c7048
[INFO] running `Command { std: "docker" "start" "-a" "947c973efbf30fa84362178302cb8e366dfb38f2ba63a73443e73f20ce0c7048", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "947c973efbf30fa84362178302cb8e366dfb38f2ba63a73443e73f20ce0c7048", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "947c973efbf30fa84362178302cb8e366dfb38f2ba63a73443e73f20ce0c7048", kill_on_drop: false }`
[INFO] [stdout] 947c973efbf30fa84362178302cb8e366dfb38f2ba63a73443e73f20ce0c7048
[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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 81afbfd610d57f69bc0245960101a93440c2d8d2168dd8160aadaf3b54a08df3
[INFO] running `Command { std: "docker" "start" "-a" "81afbfd610d57f69bc0245960101a93440c2d8d2168dd8160aadaf3b54a08df3", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.2.30
[INFO] [stderr]    Compiling slab v0.4.10
[INFO] [stderr]    Compiling hashbrown v0.15.4
[INFO] [stderr]    Compiling zerovec v0.11.2
[INFO] [stderr]    Compiling tokio-util v0.7.15
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling regex-automata v0.4.12
[INFO] [stderr]    Compiling chrono v0.4.42
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling indexmap v2.10.0
[INFO] [stderr]    Compiling tinystr v0.8.1
[INFO] [stderr]    Compiling potential_utf v0.1.2
[INFO] [stderr]    Compiling icu_collections v2.0.0
[INFO] [stderr]    Compiling icu_locale_core v2.0.0
[INFO] [stderr]    Compiling h2 v0.4.11
[INFO] [stderr]    Compiling openssl-sys v0.9.109
[INFO] [stderr]    Compiling icu_provider v2.0.0
[INFO] [stderr]    Compiling icu_properties v2.0.1
[INFO] [stderr]    Compiling openssl v0.10.73
[INFO] [stderr]    Compiling native-tls v0.2.14
[INFO] [stderr]    Compiling icu_normalizer v2.0.0
[INFO] [stderr]    Compiling regex v1.12.1
[INFO] [stderr]    Compiling shellwords v1.1.0
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling idna_adapter v1.2.1
[INFO] [stderr]    Compiling idna v1.0.3
[INFO] [stderr]    Compiling tower v0.5.2
[INFO] [stderr]    Compiling serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling os_info v3.12.0
[INFO] [stderr]    Compiling serde_yaml v0.9.34+deprecated
[INFO] [stderr]    Compiling url v2.5.4
[INFO] [stderr]    Compiling tower-http v0.6.6
[INFO] [stderr]    Compiling hyper v1.6.0
[INFO] [stderr]    Compiling hyper-util v0.1.16
[INFO] [stderr]    Compiling tokio-native-tls v0.3.1
[INFO] [stderr]    Compiling hyper-tls v0.6.0
[INFO] [stderr]    Compiling reqwest v0.12.23
[INFO] [stderr]    Compiling libstrawberry v1.4.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 51.24s
[INFO] running `Command { std: "docker" "inspect" "81afbfd610d57f69bc0245960101a93440c2d8d2168dd8160aadaf3b54a08df3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81afbfd610d57f69bc0245960101a93440c2d8d2168dd8160aadaf3b54a08df3", kill_on_drop: false }`
[INFO] [stdout] 81afbfd610d57f69bc0245960101a93440c2d8d2168dd8160aadaf3b54a08df3
[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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c86abf27534e6b416d58d7ba021f3f4d2f7376d7a958f5815855a7f24a049a08
[INFO] running `Command { std: "docker" "start" "-a" "c86abf27534e6b416d58d7ba021f3f4d2f7376d7a958f5815855a7f24a049a08", kill_on_drop: false }`
[INFO] [stderr]    Compiling libstrawberry v1.4.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `Command { std: "docker" "inspect" "c86abf27534e6b416d58d7ba021f3f4d2f7376d7a958f5815855a7f24a049a08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c86abf27534e6b416d58d7ba021f3f4d2f7376d7a958f5815855a7f24a049a08", kill_on_drop: false }`
[INFO] [stdout] c86abf27534e6b416d58d7ba021f3f4d2f7376d7a958f5815855a7f24a049a08
[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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-01-20" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3b5d2237f12997f1fe4ca43bb10366e8450fb4e011c5975f172629581190b22a
[INFO] running `Command { std: "docker" "start" "-a" "3b5d2237f12997f1fe4ca43bb10366e8450fb4e011c5975f172629581190b22a", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.22s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/libstrawberry-2bc7fb3a294342b7)
[INFO] [stdout] running 0 tests
[INFO] [stderr]    Doc-tests libstrawberry
[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 5 tests
[INFO] [stdout] test src/file.rs - file::read_file (line 9) ... FAILED
[INFO] [stdout] test src/file.rs - file::write_to_file (line 30) ... FAILED
[INFO] [stdout] test src/file.rs - file::PersistentFile::write (line 119) ... ok
[INFO] [stdout] test src/file.rs - file::PersistentFile::read (line 85) ... ok
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] [stdout] test src/file.rs - file::PersistentFile::new (line 59) ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/file.rs - file::read_file (line 9) stdout ----
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/file.rs:12:39
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_file_rs_9_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 11 | use libstrawberry::file::read_file;
[INFO] [stdout] 12 | let content = read_file("example.txt")?;
[INFO] [stdout]    |                                       ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 10 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_file_rs_9_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout] 11 | use libstrawberry::file::read_file;
[INFO] [stdout] 12 | let content = read_file("example.txt")?;
[INFO] [stdout] 13 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/file.rs - file::write_to_file (line 30) stdout ----
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/file.rs:33:45
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_file_rs_30_0() {
[INFO] [stdout]    |                                      ----------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 32 | use libstrawberry::file::write_to_file;
[INFO] [stdout] 33 | write_to_file("example.txt", "Hello World!")?;
[INFO] [stdout]    |                                             ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 31 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_file_rs_30_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout] 32 | use libstrawberry::file::write_to_file;
[INFO] [stdout] 33 | write_to_file("example.txt", "Hello World!")?;
[INFO] [stdout] 34 +     Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/file.rs - file::read_file (line 9)
[INFO] [stdout]     src/file.rs - file::write_to_file (line 30)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 3 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.80s
[INFO] [stdout] 
[INFO] [stdout] all doctests ran in 0.98s; merged doctests compilation took 0.18s
[INFO] running `Command { std: "docker" "inspect" "3b5d2237f12997f1fe4ca43bb10366e8450fb4e011c5975f172629581190b22a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b5d2237f12997f1fe4ca43bb10366e8450fb4e011c5975f172629581190b22a", kill_on_drop: false }`
[INFO] [stdout] 3b5d2237f12997f1fe4ca43bb10366e8450fb4e011c5975f172629581190b22a
