[INFO] fetching crate ffpb 0.1.1...
[INFO] checking ffpb-0.1.1 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate ffpb 0.1.1 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate ffpb 0.1.1 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 crates.io crate ffpb 0.1.1
[INFO] finished tweaking crates.io crate ffpb 0.1.1
[INFO] tweaked toml for crates.io crate ffpb 0.1.1 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate ffpb 0.1.1 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]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded kdam v0.1.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] c0d1d2f928446a825226903bc6567e72f61e64022a0742902d9539da12e9ce07
[INFO] running `Command { std: "docker" "start" "-a" "c0d1d2f928446a825226903bc6567e72f61e64022a0742902d9539da12e9ce07", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c0d1d2f928446a825226903bc6567e72f61e64022a0742902d9539da12e9ce07", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0d1d2f928446a825226903bc6567e72f61e64022a0742902d9539da12e9ce07", kill_on_drop: false }`
[INFO] [stdout] c0d1d2f928446a825226903bc6567e72f61e64022a0742902d9539da12e9ce07
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 5c7980ac0e0f395bda1ab964e0343d4b8d7416adf375cf7cf144dc263da70e17
[INFO] running `Command { std: "docker" "start" "-a" "5c7980ac0e0f395bda1ab964e0343d4b8d7416adf375cf7cf144dc263da70e17", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking regex-syntax v0.6.26
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking terminal_size v0.1.17
[INFO] [stderr]     Checking kdam v0.1.7
[INFO] [stderr]     Checking regex v1.5.6
[INFO] [stderr]     Checking ffpb v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.55s
[INFO] running `Command { std: "docker" "inspect" "5c7980ac0e0f395bda1ab964e0343d4b8d7416adf375cf7cf144dc263da70e17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c7980ac0e0f395bda1ab964e0343d4b8d7416adf375cf7cf144dc263da70e17", kill_on_drop: false }`
[INFO] [stdout] 5c7980ac0e0f395bda1ab964e0343d4b8d7416adf375cf7cf144dc263da70e17
[INFO] checking ffpb-0.1.1 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate ffpb 0.1.1 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate ffpb 0.1.1 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 crates.io crate ffpb 0.1.1
[INFO] finished tweaking crates.io crate ffpb 0.1.1
[INFO] tweaked toml for crates.io crate ffpb 0.1.1 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate crates.io crate ffpb 0.1.1 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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 702af66b794850585707fe83995ee90eaaac0193429cc0bef4d9ef392b0f78da
[INFO] running `Command { std: "docker" "start" "-a" "702af66b794850585707fe83995ee90eaaac0193429cc0bef4d9ef392b0f78da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "702af66b794850585707fe83995ee90eaaac0193429cc0bef4d9ef392b0f78da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "702af66b794850585707fe83995ee90eaaac0193429cc0bef4d9ef392b0f78da", kill_on_drop: false }`
[INFO] [stdout] 702af66b794850585707fe83995ee90eaaac0193429cc0bef4d9ef392b0f78da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 12be72f86bf91b4ac0f64717e6555794999cba6b0e05fcce3ac7ddeccb27f5fc
[INFO] running `Command { std: "docker" "start" "-a" "12be72f86bf91b4ac0f64717e6555794999cba6b0e05fcce3ac7ddeccb27f5fc", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking regex-syntax v0.6.26
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking terminal_size v0.1.17
[INFO] [stderr]     Checking kdam v0.1.7
[INFO] [stderr]     Checking regex v1.5.6
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/regex-1.5.6/src/exec.rs:848:13
[INFO] [stdout]     |
[INFO] [stdout] 848 | /             match dfa::Fsm::reverse(
[INFO] [stdout] 849 | |                 &self.ro.dfa_reverse,
[INFO] [stdout] 850 | |                 self.cache.value(),
[INFO] [stdout] 851 | |                 false,
[INFO] [stdout] ...   |
[INFO] [stdout] 862 | |                 Quit => return Some(Quit),
[INFO] [stdout] 863 | |             };
[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" "12be72f86bf91b4ac0f64717e6555794999cba6b0e05fcce3ac7ddeccb27f5fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12be72f86bf91b4ac0f64717e6555794999cba6b0e05fcce3ac7ddeccb27f5fc", kill_on_drop: false }`
[INFO] [stdout] 12be72f86bf91b4ac0f64717e6555794999cba6b0e05fcce3ac7ddeccb27f5fc