[INFO] fetching crate u8pool 1.0.0...
[INFO] testing u8pool-1.0.0 against try#b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b for pr-145330-1
[INFO] extracting crate u8pool 1.0.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate u8pool 1.0.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate u8pool 1.0.0
[INFO] tweaked toml for crates.io crate u8pool 1.0.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate u8pool 1.0.0 on toolchain b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate u8pool 1.0.0 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" "+b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b" "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-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 08755358315d6ef392ece8b99c752ed089b3871937f01b75448f82b4325041fb
[INFO] running `Command { std: "docker" "start" "-a" "08755358315d6ef392ece8b99c752ed089b3871937f01b75448f82b4325041fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "08755358315d6ef392ece8b99c752ed089b3871937f01b75448f82b4325041fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08755358315d6ef392ece8b99c752ed089b3871937f01b75448f82b4325041fb", kill_on_drop: false }`
[INFO] [stdout] 08755358315d6ef392ece8b99c752ed089b3871937f01b75448f82b4325041fb
[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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8cc417b5e80d232936230c1cb8b4666e14b3457488b6c7001513139b5bba479f
[INFO] running `Command { std: "docker" "start" "-a" "8cc417b5e80d232936230c1cb8b4666e14b3457488b6c7001513139b5bba479f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]    Compiling thiserror-impl v2.0.12
[INFO] [stderr]    Compiling thiserror v2.0.12
[INFO] [stderr]    Compiling u8pool v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.20s
[INFO] running `Command { std: "docker" "inspect" "8cc417b5e80d232936230c1cb8b4666e14b3457488b6c7001513139b5bba479f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8cc417b5e80d232936230c1cb8b4666e14b3457488b6c7001513139b5bba479f", kill_on_drop: false }`
[INFO] [stdout] 8cc417b5e80d232936230c1cb8b4666e14b3457488b6c7001513139b5bba479f
[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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f587e4c013b3eaded9e9ad6a92a0628b058f5f9a8bd2d97f7041967556c9bacc
[INFO] running `Command { std: "docker" "start" "-a" "f587e4c013b3eaded9e9ad6a92a0628b058f5f9a8bd2d97f7041967556c9bacc", kill_on_drop: false }`
[INFO] [stderr]    Compiling u8pool v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.50s
[INFO] running `Command { std: "docker" "inspect" "f587e4c013b3eaded9e9ad6a92a0628b058f5f9a8bd2d97f7041967556c9bacc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f587e4c013b3eaded9e9ad6a92a0628b058f5f9a8bd2d97f7041967556c9bacc", kill_on_drop: false }`
[INFO] [stdout] f587e4c013b3eaded9e9ad6a92a0628b058f5f9a8bd2d97f7041967556c9bacc
[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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] fa62a023b0e94e33c3fd3cf9aa2b2c48b21c248d15b01109cafc7488c1cb6b1a
[INFO] running `Command { std: "docker" "start" "-a" "fa62a023b0e94e33c3fd3cf9aa2b2c48b21c248d15b01109cafc7488c1cb6b1a", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/u8pool-3b6f85bb4bba24c1)
[INFO] [stdout] 
[INFO] [stderr]      Running tests/dictionary_tests.rs (/opt/rustwide/target/debug/deps/dictionary_tests-a0946a6441751072)
[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 5 tests
[INFO] [stdout] test test_dictionary_iterator_even_elements ... ok
[INFO] [stdout] test test_dictionary_iterator_odd_elements ... ok
[INFO] [stdout] test test_dictionary_iterator_single_key ... ok
[INFO] [stdout] test test_mixed_usage_vector_and_dictionary ... ok
[INFO] [stdout] test test_dictionary_iterator_empty ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/iterator_tests.rs (/opt/rustwide/target/debug/deps/iterator_tests-354d8380fd3dbeb7)
[INFO] [stdout] 
[INFO] [stdout] running 9 tests
[INFO] [stdout] test test_iterator_empty_vector ... ok
[INFO] [stdout] test test_iterator_single_item ... ok
[INFO] [stdout] test test_iterator_size_hint ... ok
[INFO] [stdout] test test_reverse_iterator_compare_with_forward ... ok
[INFO] [stdout] test test_reverse_iterator_size_hint ... ok
[INFO] [stdout] test test_reverse_iterator_populated_vector ... ok
[INFO] [stdout] test test_iterator_populated_vector ... ok
[INFO] [stderr]      Running tests/stack_tests.rs (/opt/rustwide/target/debug/deps/stack_tests-81ae3fa63ce445bd)
[INFO] [stdout] test test_reverse_iterator_single_item ... ok
[INFO] [stdout] test test_reverse_iterator_empty_vector ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 11 tests
[INFO] [stdout] test test_bounds_checking_empty_buffer ... ok
[INFO] [stdout] test test_buffer_initialization ... ok
[INFO] [stdout] test test_custom_max_slices ... ok
[INFO] [stdout] test test_clear_operation ... ok
[INFO] [stdout] test test_get_out_of_bounds ... ok
[INFO] [stdout] test test_pop_empty_vector ... ok
[INFO] [stdout] test test_pop_operation ... ok
[INFO] [stdout] test test_stack_push_operations ... ok
[INFO] [stdout] test test_stack_buffer_overflow ... ok
[INFO] [stdout] test test_stack_push_pop_operations ... ok
[INFO] [stdout] test test_stack_utility_methods ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests u8pool
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 8) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 8) 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/lib.rs:13:62
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]   |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 8 | let mut u8pool = U8Pool::with_default_max_slices(&mut buffer)?;
[INFO] [stdout]   |                                                              ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]   |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]   |                                                                        +++++++++++++++++++++++++++++++++++++++++
[INFO] [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/lib.rs:16:21
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 11 | u8pool.push(b"name")?;
[INFO] [stdout]    |                     ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                        +++++++++++++++++++++++++++++++++++++++++
[INFO] [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/lib.rs:17:22
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 12 | u8pool.push(b"Alice")?;
[INFO] [stdout]    |                      ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                        +++++++++++++++++++++++++++++++++++++++++
[INFO] [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/lib.rs:18:20
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 13 | u8pool.push(b"age")?;
[INFO] [stdout]    |                    ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                        +++++++++++++++++++++++++++++++++++++++++
[INFO] [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/lib.rs:19:19
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 14 | u8pool.push(b"30")?;
[INFO] [stdout]    |                   ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                        +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `unwrap` found for reference `&[u8]` in the current scope
[INFO] [stdout]   --> src/lib.rs:35:40
[INFO] [stdout]    |
[INFO] [stdout] 30 |              std::str::from_utf8(value.unwrap()).unwrap());
[INFO] [stdout]    |                                        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `swap` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/b6ae10aa7319b7ebb6c7b3331dd71a9d6c9c5b4b/library/core/src/slice/mod.rs:901:5
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0599.
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 8)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.21s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "fa62a023b0e94e33c3fd3cf9aa2b2c48b21c248d15b01109cafc7488c1cb6b1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa62a023b0e94e33c3fd3cf9aa2b2c48b21c248d15b01109cafc7488c1cb6b1a", kill_on_drop: false }`
[INFO] [stdout] fa62a023b0e94e33c3fd3cf9aa2b2c48b21c248d15b01109cafc7488c1cb6b1a