[INFO] cloning repository https://github.com/exphp-share/open-learning-opt
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/exphp-share/open-learning-opt" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fexphp-share%2Fopen-learning-opt", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fexphp-share%2Fopen-learning-opt'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c569ee3305c4a44a4dcaaedf9b6043d7fa8af9d6
[INFO] checking exphp-share/open-learning-opt against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fexphp-share%2Fopen-learning-opt" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/exphp-share/open-learning-opt on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/exphp-share/open-learning-opt
[INFO] finished tweaking git repo https://github.com/exphp-share/open-learning-opt
[INFO] tweaked toml for git repo https://github.com/exphp-share/open-learning-opt written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/exphp-share/open-learning-opt 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: target.x86_64-pc-windows-gnu.linker
[INFO] [stderr] warning: unused manifest key: toolchain
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded encode_unicode v0.3.5
[INFO] [stderr]   Downloaded clicolors-control v1.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 15643ffc18d15525e727d23420949cbb6f6f383df47c2f61c2b23b55469174c5
[INFO] running `Command { std: "docker" "start" "-a" "15643ffc18d15525e727d23420949cbb6f6f383df47c2f61c2b23b55469174c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "15643ffc18d15525e727d23420949cbb6f6f383df47c2f61c2b23b55469174c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15643ffc18d15525e727d23420949cbb6f6f383df47c2f61c2b23b55469174c5", kill_on_drop: false }`
[INFO] [stdout] 15643ffc18d15525e727d23420949cbb6f6f383df47c2f61c2b23b55469174c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b7ec27e5e2c4c5ad3cb2871bdcf55840dd7e0e5a528b9d715beb0d38ffcce96b
[INFO] running `Command { std: "docker" "start" "-a" "b7ec27e5e2c4c5ad3cb2871bdcf55840dd7e0e5a528b9d715beb0d38ffcce96b", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: target.x86_64-pc-windows-gnu.linker
[INFO] [stderr] warning: unused manifest key: toolchain
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking smallvec v0.6.10
[INFO] [stderr]    Compiling rayon-core v1.5.0
[INFO] [stderr]     Checking regex-syntax v0.6.11
[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking lock_api v0.3.1
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]     Checking aho-corasick v0.7.6
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking clicolors-control v1.0.0
[INFO] [stderr]     Checking termios v0.3.1
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking crossbeam-deque v0.6.3
[INFO] [stderr]     Checking rayon v1.1.0
[INFO] [stderr]     Checking regex v1.2.1
[INFO] [stderr]     Checking console v0.7.7
[INFO] [stderr]     Checking open_learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `finished`
[INFO] [stdout]   --> src/main.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let finished: Mutex<terminal_render::Type> = Mutex::new(terminal_render::Type::new(0));
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_finished`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ln`
[INFO] [stdout]   --> src/main.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |     let ln = vpn.len() as f32;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_ln`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `finished`
[INFO] [stdout]   --> src/main.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let finished: Mutex<terminal_render::Type> = Mutex::new(terminal_render::Type::new(0));
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_finished`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ln`
[INFO] [stdout]   --> src/main.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |     let ln = vpn.len() as f32;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_ln`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lastp`
[INFO] [stdout]   --> src/main.rs:83:9
[INFO] [stdout]    |
[INFO] [stdout] 83 |     let lastp: Mutex<terminal_render::Type> = Mutex::new(terminal_render::Type::new(0));
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_lastp`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lastp`
[INFO] [stdout]   --> src/main.rs:83:9
[INFO] [stdout]    |
[INFO] [stdout] 83 |     let lastp: Mutex<terminal_render::Type> = Mutex::new(terminal_render::Type::new(0));
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_lastp`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `temps_restant` is never used
[INFO] [stdout]    --> src/main.rs:112:4
[INFO] [stdout]     |
[INFO] [stdout] 112 | fn temps_restant(i: &Instant,p: f32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `temps_restant` is never used
[INFO] [stdout]    --> src/main.rs:112:4
[INFO] [stdout]     |
[INFO] [stdout] 112 | fn temps_restant(i: &Instant,p: f32) -> u32 {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.54s
[INFO] running `Command { std: "docker" "inspect" "b7ec27e5e2c4c5ad3cb2871bdcf55840dd7e0e5a528b9d715beb0d38ffcce96b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7ec27e5e2c4c5ad3cb2871bdcf55840dd7e0e5a528b9d715beb0d38ffcce96b", kill_on_drop: false }`
[INFO] [stdout] b7ec27e5e2c4c5ad3cb2871bdcf55840dd7e0e5a528b9d715beb0d38ffcce96b
[INFO] checking exphp-share/open-learning-opt against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fexphp-share%2Fopen-learning-opt" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/exphp-share/open-learning-opt on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/exphp-share/open-learning-opt
[INFO] finished tweaking git repo https://github.com/exphp-share/open-learning-opt
[INFO] tweaked toml for git repo https://github.com/exphp-share/open-learning-opt written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/exphp-share/open-learning-opt 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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: target.x86_64-pc-windows-gnu.linker
[INFO] [stderr] warning: unused manifest key: toolchain
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] db78617d8cd348236a86051c711a20993404004880c434c7082de55aacb50ac4
[INFO] running `Command { std: "docker" "start" "-a" "db78617d8cd348236a86051c711a20993404004880c434c7082de55aacb50ac4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "db78617d8cd348236a86051c711a20993404004880c434c7082de55aacb50ac4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db78617d8cd348236a86051c711a20993404004880c434c7082de55aacb50ac4", kill_on_drop: false }`
[INFO] [stdout] db78617d8cd348236a86051c711a20993404004880c434c7082de55aacb50ac4
[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=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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a6abf1e39f7a0cfdfbd6b754fbddec6879860b6c0eb31c57582e7286f5b83bc4
[INFO] running `Command { std: "docker" "start" "-a" "a6abf1e39f7a0cfdfbd6b754fbddec6879860b6c0eb31c57582e7286f5b83bc4", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: target.x86_64-pc-windows-gnu.linker
[INFO] [stderr] warning: unused manifest key: toolchain
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]    Compiling arrayvec v0.4.11
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking smallvec v0.6.10
[INFO] [stderr]    Compiling rayon-core v1.5.0
[INFO] [stderr]     Checking regex-syntax v0.6.11
[INFO] [stderr]     Checking either v1.5.2
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]     Checking lock_api v0.3.1
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]     Checking aho-corasick v0.7.6
[INFO] [stderr]     Checking num_cpus v1.10.1
[INFO] [stderr]     Checking termios v0.3.1
[INFO] [stderr]     Checking clicolors-control v1.0.0
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking crossbeam-deque v0.6.3
[INFO] [stderr]     Checking regex v1.2.1
[INFO] [stderr]     Checking rayon v1.1.0
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/regex-1.2.1/src/exec.rs:797:13
[INFO] [stdout]     |
[INFO] [stdout] 797 | /             match dfa::Fsm::reverse(
[INFO] [stdout] 798 | |                 &self.ro.dfa_reverse,
[INFO] [stdout] 799 | |                 self.cache,
[INFO] [stdout] 800 | |                 false,
[INFO] [stdout] ...   |
[INFO] [stdout] 811 | |                 Quit => return Some(Quit),
[INFO] [stdout] 812 | |             };
[INFO] [stdout]     | |_____________^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `regex` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "a6abf1e39f7a0cfdfbd6b754fbddec6879860b6c0eb31c57582e7286f5b83bc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6abf1e39f7a0cfdfbd6b754fbddec6879860b6c0eb31c57582e7286f5b83bc4", kill_on_drop: false }`
[INFO] [stdout] a6abf1e39f7a0cfdfbd6b754fbddec6879860b6c0eb31c57582e7286f5b83bc4