[INFO] cloning repository https://github.com/wezm/rust-intro-talk
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wezm/rust-intro-talk" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwezm%2Frust-intro-talk", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwezm%2Frust-intro-talk'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 978872c31d714aa413ee86a7c6b5ccdbc8966caa
[INFO] testing wezm/rust-intro-talk against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwezm%2Frust-intro-talk" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wezm/rust-intro-talk on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wezm/rust-intro-talk
[INFO] finished tweaking git repo https://github.com/wezm/rust-intro-talk
[INFO] tweaked toml for git repo https://github.com/wezm/rust-intro-talk written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/wezm/rust-intro-talk already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0af5b6a4bd168c450a676d0fecb7a024678f31fce4d893c687f8e91ab05193a9
[INFO] running `Command { std: "docker" "start" "-a" "0af5b6a4bd168c450a676d0fecb7a024678f31fce4d893c687f8e91ab05193a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0af5b6a4bd168c450a676d0fecb7a024678f31fce4d893c687f8e91ab05193a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0af5b6a4bd168c450a676d0fecb7a024678f31fce4d893c687f8e91ab05193a9", kill_on_drop: false }`
[INFO] [stdout] 0af5b6a4bd168c450a676d0fecb7a024678f31fce4d893c687f8e91ab05193a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aec62a66192b1e239fa5b102d19a33d3a81a00c4e511360b2eddfebc0f8b17b3
[INFO] running `Command { std: "docker" "start" "-a" "aec62a66192b1e239fa5b102d19a33d3a81a00c4e511360b2eddfebc0f8b17b3", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.35
[INFO] [stderr]    Compiling cc v1.0.3
[INFO] [stderr]    Compiling rustc-demangle v0.1.5
[INFO] [stderr]    Compiling serde v1.0.27
[INFO] [stderr]    Compiling cfg-if v0.1.2
[INFO] [stderr]    Compiling pulldown-cmark v0.1.0
[INFO] [stderr]    Compiling dtoa v0.4.2
[INFO] [stderr]    Compiling num-traits v0.1.41
[INFO] [stderr]    Compiling itoa v0.3.4
[INFO] [stderr]    Compiling same-file v0.1.3
[INFO] [stderr]    Compiling bytecount v0.2.0
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling walkdir v1.0.7
[INFO] [stderr]    Compiling rand v0.3.19
[INFO] [stderr]    Compiling serde_derive_internals v0.19.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.16
[INFO] [stderr]    Compiling tempdir v0.3.5
[INFO] [stderr]    Compiling serde_derive v1.0.27
[INFO] [stderr]    Compiling serde_json v1.0.9
[INFO] [stderr]    Compiling semver v0.8.0
[INFO] [stderr]    Compiling backtrace v0.3.5
[INFO] [stderr]    Compiling error-chain v0.11.0
[INFO] [stderr]    Compiling cargo_metadata v0.3.3
[INFO] [stderr]    Compiling skeptic v0.13.2
[INFO] [stderr]    Compiling demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 28.24s
[INFO] running `Command { std: "docker" "inspect" "aec62a66192b1e239fa5b102d19a33d3a81a00c4e511360b2eddfebc0f8b17b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aec62a66192b1e239fa5b102d19a33d3a81a00c4e511360b2eddfebc0f8b17b3", kill_on_drop: false }`
[INFO] [stdout] aec62a66192b1e239fa5b102d19a33d3a81a00c4e511360b2eddfebc0f8b17b3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 44b976675d8448797141f14b49c5858226cc35717f8575d0a1e17e283a0841a4
[INFO] running `Command { std: "docker" "start" "-a" "44b976675d8448797141f14b49c5858226cc35717f8575d0a1e17e283a0841a4", kill_on_drop: false }`
[INFO] [stderr]    Compiling demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.62s
[INFO] running `Command { std: "docker" "inspect" "44b976675d8448797141f14b49c5858226cc35717f8575d0a1e17e283a0841a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44b976675d8448797141f14b49c5858226cc35717f8575d0a1e17e283a0841a4", kill_on_drop: false }`
[INFO] [stdout] 44b976675d8448797141f14b49c5858226cc35717f8575d0a1e17e283a0841a4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3ea1d1c3d2dd718004d3dbe97c06e829cbca8cb53040cfa4a0b1feea36fb17d7
[INFO] running `Command { std: "docker" "start" "-a" "3ea1d1c3d2dd718004d3dbe97c06e829cbca8cb53040cfa4a0b1feea36fb17d7", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stdout] running 5 tests
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/demo-9dc5ee9cd9f5c92c)
[INFO] [stdout] test test_file_type_rust ... ok
[INFO] [stdout] test test_file_type_html ... ok
[INFO] [stdout] test test_file_type_toml ... ok
[INFO] [stdout] test test_file_type_unknown ... ok
[INFO] [stdout] test test_file_type_missing ... 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/slides.rs (/opt/rustwide/target/debug/deps/slides-be46067017ff2db9)
[INFO] [stdout] 
[INFO] [stdout] running 11 tests
[INFO] [stdout] test slides_in_sect_conditionals_if_line_231 has been running for over 60 seconds
[INFO] [stdout] test slides_in_sect_conditionals_match_line_248 has been running for over 60 seconds
[INFO] [stdout] test slides_in_sect_enums_line_324 has been running for over 60 seconds
[INFO] [stdout] test slides_in_sect_functional_or_imperative_line_286 has been running for over 60 seconds
[INFO] [stdout] test slides_in_sect_functional_or_imperative_line_304 has been running for over 60 seconds
[INFO] [stdout] test slides_in_sect_functions_line_217 has been running for over 60 seconds
[INFO] [stdout] test slides_in_sect_introduction_line_25 has been running for over 60 seconds
[INFO] [stdout] test slides_in_sect_loops_line_268 has been running for over 60 seconds
[INFO] [stdout] test slides_in_sect_option_line_362 has been running for over 60 seconds
[INFO] [stdout] test slides_in_sect_result_line_377 has been running for over 60 seconds
[INFO] [stdout] test slides_in_sect_structs_line_340 has been running for over 60 seconds
[INFO] [stderr] warning: enum is never used: `Option`
[INFO] [stderr]  --> /tmp/rust-skeptic.8R7rypAcbFsI/test.rs:2:6
[INFO] [stderr]   |
[INFO] [stderr] 2 | enum Option<T> {
[INFO] [stderr]   |      ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stdout] test slides_in_sect_option_line_362 ... ok
[INFO] [stdout] test slides_in_sect_functional_or_imperative_line_286 ... ok
[INFO] [stdout] test slides_in_sect_conditionals_match_line_248 ... ok
[INFO] [stderr] warning: enum is never used: `Result`
[INFO] [stderr]  --> /tmp/rust-skeptic.IbTUvUUvyWge/test.rs:2:6
[INFO] [stderr]   |
[INFO] [stderr] 2 | enum Result<T, E> {
[INFO] [stderr]   |      ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stdout] test slides_in_sect_result_line_377 ... ok
[INFO] [stdout] test slides_in_sect_functional_or_imperative_line_304 ... ok
[INFO] [stdout] Rust Introduction
[INFO] [stdout] test slides_in_sect_introduction_line_25 ... ok
[INFO] [stderr] warning: enum is never used: `SerialProtocol`
[INFO] [stderr]  --> /tmp/rust-skeptic.wtCS7EnR5ZU6/test.rs:2:6
[INFO] [stderr]   |
[INFO] [stderr] 2 | enum SerialProtocol {
[INFO] [stderr]   |      ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stdout] test slides_in_sect_enums_line_324 ... ok
[INFO] [stderr] warning: enum is never used: `SerialProtocol`
[INFO] [stderr]  --> /tmp/rust-skeptic.GfO4gg0zREBW/test.rs:2:6
[INFO] [stderr]   |
[INFO] [stderr] 2 | enum SerialProtocol {
[INFO] [stderr]   |      ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Person`
[INFO] [stderr]   --> /tmp/rust-skeptic.GfO4gg0zREBW/test.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | struct Person {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `name_and_age`
[INFO] [stderr]   --> /tmp/rust-skeptic.GfO4gg0zREBW/test.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 |     fn name_and_age(&self) -> String {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stdout] test slides_in_sect_structs_line_340 ... ok
[INFO] [stdout] Wesley is happy
[INFO] [stdout] test slides_in_sect_conditionals_if_line_231 ... ok
[INFO] [stderr] warning: unused variable: `sum`
[INFO] [stderr]  --> /tmp/rust-skeptic.WSIMDW9ua8Cg/test.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let sum = add(2, 3);
[INFO] [stderr]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stdout] test slides_in_sect_functions_line_217 ... ok
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]  --> /tmp/rust-skeptic.G5Bd6xZn1XPA/test.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | for i in numbers.iter() {
[INFO] [stderr]   |     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]  --> /tmp/rust-skeptic.G5Bd6xZn1XPA/test.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | for i in 0..10 {
[INFO] [stderr]   |     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stdout] test slides_in_sect_loops_line_268 ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 130.91s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "3ea1d1c3d2dd718004d3dbe97c06e829cbca8cb53040cfa4a0b1feea36fb17d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ea1d1c3d2dd718004d3dbe97c06e829cbca8cb53040cfa4a0b1feea36fb17d7", kill_on_drop: false }`
[INFO] [stdout] 3ea1d1c3d2dd718004d3dbe97c06e829cbca8cb53040cfa4a0b1feea36fb17d7