[INFO] cloning repository https://github.com/tonsky/icfpc2019-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tonsky/icfpc2019-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftonsky%2Ficfpc2019-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftonsky%2Ficfpc2019-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6d2c59330a42adfb4b15147ccf03c34c38959ba5
[INFO] checking tonsky/icfpc2019-rust against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftonsky%2Ficfpc2019-rust" "/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/tonsky/icfpc2019-rust 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/tonsky/icfpc2019-rust
[INFO] finished tweaking git repo https://github.com/tonsky/icfpc2019-rust
[INFO] tweaked toml for git repo https://github.com/tonsky/icfpc2019-rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/tonsky/icfpc2019-rust 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]  Downloading crates ...
[INFO] [stderr]   Downloaded rand_pcg v0.2.0
[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] 109c723210f93f806cefaefc16192ad24b7432e068c3d5d76decab207b2fd84a
[INFO] running `Command { std: "docker" "start" "-a" "109c723210f93f806cefaefc16192ad24b7432e068c3d5d76decab207b2fd84a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "109c723210f93f806cefaefc16192ad24b7432e068c3d5d76decab207b2fd84a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "109c723210f93f806cefaefc16192ad24b7432e068c3d5d76decab207b2fd84a", kill_on_drop: false }`
[INFO] [stdout] 109c723210f93f806cefaefc16192ad24b7432e068c3d5d76decab207b2fd84a
[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] 63270ace8a1f22fe50c6da9952717c5cb673e82312d4cbfeb249e5f5b8e936ea
[INFO] running `Command { std: "docker" "start" "-a" "63270ace8a1f22fe50c6da9952717c5cb673e82312d4cbfeb249e5f5b8e936ea", kill_on_drop: false }`
[INFO] [stderr]     Checking spin v0.5.0
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]    Compiling regex v1.1.7
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]     Checking regex-syntax v0.6.7
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]    Compiling rand_chacha v0.2.0
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]     Checking aho-corasick v0.7.3
[INFO] [stderr]     Checking getrandom v0.1.6
[INFO] [stderr]     Checking rand_core v0.5.0
[INFO] [stderr]     Checking rand_pcg v0.2.0
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking icfpc2019 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:529:17
[INFO] [stdout]     |
[INFO] [stdout] 529 |             let mut drone = &mut drones[drone_idx];
[INFO] [stdout]     |                 ----^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:529:17
[INFO] [stdout]     |
[INFO] [stdout] 529 |             let mut drone = &mut drones[drone_idx];
[INFO] [stdout]     |                 ----^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.70s
[INFO] running `Command { std: "docker" "inspect" "63270ace8a1f22fe50c6da9952717c5cb673e82312d4cbfeb249e5f5b8e936ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63270ace8a1f22fe50c6da9952717c5cb673e82312d4cbfeb249e5f5b8e936ea", kill_on_drop: false }`
[INFO] [stdout] 63270ace8a1f22fe50c6da9952717c5cb673e82312d4cbfeb249e5f5b8e936ea
[INFO] checking tonsky/icfpc2019-rust against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftonsky%2Ficfpc2019-rust" "/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/tonsky/icfpc2019-rust 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/tonsky/icfpc2019-rust
[INFO] finished tweaking git repo https://github.com/tonsky/icfpc2019-rust
[INFO] tweaked toml for git repo https://github.com/tonsky/icfpc2019-rust written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/tonsky/icfpc2019-rust 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] 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] fdf0be822c81c530f3cfa805a09e64e2c3cb44eef94825fd358398a675af118e
[INFO] running `Command { std: "docker" "start" "-a" "fdf0be822c81c530f3cfa805a09e64e2c3cb44eef94825fd358398a675af118e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fdf0be822c81c530f3cfa805a09e64e2c3cb44eef94825fd358398a675af118e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdf0be822c81c530f3cfa805a09e64e2c3cb44eef94825fd358398a675af118e", kill_on_drop: false }`
[INFO] [stdout] fdf0be822c81c530f3cfa805a09e64e2c3cb44eef94825fd358398a675af118e
[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] 3d6c3295ebceaacd4110845a223eb58d2ff42e0da833455284a6f7bf085a314c
[INFO] running `Command { std: "docker" "start" "-a" "3d6c3295ebceaacd4110845a223eb58d2ff42e0da833455284a6f7bf085a314c", kill_on_drop: false }`
[INFO] [stderr]     Checking spin v0.5.0
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]    Compiling regex v1.1.7
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]     Checking regex-syntax v0.6.7
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]    Compiling rand_chacha v0.2.0
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]     Checking aho-corasick v0.7.3
[INFO] [stderr]     Checking getrandom v0.1.6
[INFO] [stderr]     Checking rand_core v0.5.0
[INFO] [stderr]     Checking rand_pcg v0.2.0
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/regex-1.1.7/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] running `Command { std: "docker" "inspect" "3d6c3295ebceaacd4110845a223eb58d2ff42e0da833455284a6f7bf085a314c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d6c3295ebceaacd4110845a223eb58d2ff42e0da833455284a6f7bf085a314c", kill_on_drop: false }`
[INFO] [stdout] 3d6c3295ebceaacd4110845a223eb58d2ff42e0da833455284a6f7bf085a314c