[INFO] fetching crate c-arrow 0.1.4...
[INFO] testing c-arrow-0.1.4 against 1.75.0 for beta-1.76-1
[INFO] extracting crate c-arrow 0.1.4 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate c-arrow 0.1.4 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate c-arrow 0.1.4
[INFO] finished tweaking crates.io crate c-arrow 0.1.4
[INFO] tweaked toml for crates.io crate c-arrow 0.1.4 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7e244cc9a13d3234b231ddeb797c3bd09adf58ff611ab70170293d2f790ec22b
[INFO] running `Command { std: "docker" "start" "-a" "7e244cc9a13d3234b231ddeb797c3bd09adf58ff611ab70170293d2f790ec22b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7e244cc9a13d3234b231ddeb797c3bd09adf58ff611ab70170293d2f790ec22b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e244cc9a13d3234b231ddeb797c3bd09adf58ff611ab70170293d2f790ec22b", kill_on_drop: false }`
[INFO] [stdout] 7e244cc9a13d3234b231ddeb797c3bd09adf58ff611ab70170293d2f790ec22b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4941454d1d21cc1329c9736e0d13f0368ee8e6c476f3ecb3657e68e156aaa914
[INFO] running `Command { std: "docker" "start" "-a" "4941454d1d21cc1329c9736e0d13f0368ee8e6c476f3ecb3657e68e156aaa914", kill_on_drop: false }`
[INFO] [stderr]    Compiling c-arrow v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] running `Command { std: "docker" "inspect" "4941454d1d21cc1329c9736e0d13f0368ee8e6c476f3ecb3657e68e156aaa914", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4941454d1d21cc1329c9736e0d13f0368ee8e6c476f3ecb3657e68e156aaa914", kill_on_drop: false }`
[INFO] [stdout] 4941454d1d21cc1329c9736e0d13f0368ee8e6c476f3ecb3657e68e156aaa914
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9eedc79f67b8523a562295a8f69082af50f36e403fa49b96d2f83aebe26dbcff
[INFO] running `Command { std: "docker" "start" "-a" "9eedc79f67b8523a562295a8f69082af50f36e403fa49b96d2f83aebe26dbcff", kill_on_drop: false }`
[INFO] [stderr]    Compiling c-arrow v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.30s
[INFO] running `Command { std: "docker" "inspect" "9eedc79f67b8523a562295a8f69082af50f36e403fa49b96d2f83aebe26dbcff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9eedc79f67b8523a562295a8f69082af50f36e403fa49b96d2f83aebe26dbcff", kill_on_drop: false }`
[INFO] [stdout] 9eedc79f67b8523a562295a8f69082af50f36e403fa49b96d2f83aebe26dbcff
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9ccb6fb6ac61804ba0677fcedff2b4732542aa62a011f9c7a92e0384edfabc43
[INFO] running `Command { std: "docker" "start" "-a" "9ccb6fb6ac61804ba0677fcedff2b4732542aa62a011f9c7a92e0384edfabc43", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/c_arrow-37994dede74b0537)
[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] [stderr]    Doc-tests c-arrow
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 26) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 26) stdout ----
[INFO] [stdout] error[E0412]: cannot find type `Stack` in this scope
[INFO] [stdout]  --> src/lib.rs:28:16
[INFO] [stdout]   |
[INFO] [stdout] 5 | let mut stack: Stack<char> = Stack::new();
[INFO] [stdout]   |                ^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Stack`
[INFO] [stdout]  --> src/lib.rs:28:30
[INFO] [stdout]   |
[INFO] [stdout] 5 | let mut stack: Stack<char> = Stack::new();
[INFO] [stdout]   |                              ^^^^^ use of undeclared type `Stack`
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `back_of` in this scope
[INFO] [stdout]   --> src/lib.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pt![back_of(top_back)->back->data = 'x'];
[INFO] [stdout]    |         ^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0425, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 26)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.07s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "9ccb6fb6ac61804ba0677fcedff2b4732542aa62a011f9c7a92e0384edfabc43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ccb6fb6ac61804ba0677fcedff2b4732542aa62a011f9c7a92e0384edfabc43", kill_on_drop: false }`
[INFO] [stdout] 9ccb6fb6ac61804ba0677fcedff2b4732542aa62a011f9c7a92e0384edfabc43
[INFO] testing c-arrow-0.1.4 against beta-2023-12-22 for beta-1.76-1
[INFO] extracting crate c-arrow 0.1.4 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate c-arrow 0.1.4 on toolchain beta-2023-12-22
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-12-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate c-arrow 0.1.4
[INFO] finished tweaking crates.io crate c-arrow 0.1.4
[INFO] tweaked toml for crates.io crate c-arrow 0.1.4 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-12-22" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-12-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6392e95d68f201c14981b754422ec2c8111f22c5d5576a1c5e070b3fd9e44e3a
[INFO] running `Command { std: "docker" "start" "-a" "6392e95d68f201c14981b754422ec2c8111f22c5d5576a1c5e070b3fd9e44e3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6392e95d68f201c14981b754422ec2c8111f22c5d5576a1c5e070b3fd9e44e3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6392e95d68f201c14981b754422ec2c8111f22c5d5576a1c5e070b3fd9e44e3a", kill_on_drop: false }`
[INFO] [stdout] 6392e95d68f201c14981b754422ec2c8111f22c5d5576a1c5e070b3fd9e44e3a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8a4740b496b1bea9622a7e7bdb5677b34629ddcc6333aa0ffaf5617e7cf8dae5
[INFO] running `Command { std: "docker" "start" "-a" "8a4740b496b1bea9622a7e7bdb5677b34629ddcc6333aa0ffaf5617e7cf8dae5", kill_on_drop: false }`
[INFO] [stderr]    Compiling c-arrow v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] running `Command { std: "docker" "inspect" "8a4740b496b1bea9622a7e7bdb5677b34629ddcc6333aa0ffaf5617e7cf8dae5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a4740b496b1bea9622a7e7bdb5677b34629ddcc6333aa0ffaf5617e7cf8dae5", kill_on_drop: false }`
[INFO] [stdout] 8a4740b496b1bea9622a7e7bdb5677b34629ddcc6333aa0ffaf5617e7cf8dae5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1249ed2836e72fa1d33bff4daf39c0cb14f02cc285b83713f3f950aa53d7e3cb
[INFO] running `Command { std: "docker" "start" "-a" "1249ed2836e72fa1d33bff4daf39c0cb14f02cc285b83713f3f950aa53d7e3cb", kill_on_drop: false }`
[INFO] [stderr]    Compiling c-arrow v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.28s
[INFO] running `Command { std: "docker" "inspect" "1249ed2836e72fa1d33bff4daf39c0cb14f02cc285b83713f3f950aa53d7e3cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1249ed2836e72fa1d33bff4daf39c0cb14f02cc285b83713f3f950aa53d7e3cb", kill_on_drop: false }`
[INFO] [stdout] 1249ed2836e72fa1d33bff4daf39c0cb14f02cc285b83713f3f950aa53d7e3cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-12-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 49a3269113beeb694f0d801de1d72f1cc1b7d7e55555def77899107fce1369ff
[INFO] running `Command { std: "docker" "start" "-a" "49a3269113beeb694f0d801de1d72f1cc1b7d7e55555def77899107fce1369ff", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/c_arrow-ee43bce6cd9d11fb)
[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] [stderr]    Doc-tests c-arrow
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 26) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 26) stdout ----
[INFO] [stdout] error[E0412]: cannot find type `Stack` in this scope
[INFO] [stdout]  --> src/lib.rs:28:16
[INFO] [stdout]   |
[INFO] [stdout] 5 | let mut stack: Stack<char> = Stack::new();
[INFO] [stdout]   |                ^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Stack`
[INFO] [stdout]  --> src/lib.rs:28:30
[INFO] [stdout]   |
[INFO] [stdout] 5 | let mut stack: Stack<char> = Stack::new();
[INFO] [stdout]   |                              ^^^^^ use of undeclared type `Stack`
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `back_of` in this scope
[INFO] [stdout]   --> src/lib.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pt![back_of(top_back)->back->data = 'x'];
[INFO] [stdout]    |         ^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0425, E0433.
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 26)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.08s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "49a3269113beeb694f0d801de1d72f1cc1b7d7e55555def77899107fce1369ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49a3269113beeb694f0d801de1d72f1cc1b7d7e55555def77899107fce1369ff", kill_on_drop: false }`
[INFO] [stdout] 49a3269113beeb694f0d801de1d72f1cc1b7d7e55555def77899107fce1369ff
