[INFO] fetching crate toolchain_find 0.4.0...
[INFO] checking toolchain_find-0.4.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate toolchain_find 0.4.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate toolchain_find 0.4.0 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 toolchain_find 0.4.0
[INFO] finished tweaking crates.io crate toolchain_find 0.4.0
[INFO] tweaked toml for crates.io crate toolchain_find 0.4.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate toolchain_find 0.4.0 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 winapi-util v0.1.1
[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] 4331bcf8457e9c885e7c17f33f1672f2224eafd887f891de1e2f183733648827
[INFO] running `Command { std: "docker" "start" "-a" "4331bcf8457e9c885e7c17f33f1672f2224eafd887f891de1e2f183733648827", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4331bcf8457e9c885e7c17f33f1672f2224eafd887f891de1e2f183733648827", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4331bcf8457e9c885e7c17f33f1672f2224eafd887f891de1e2f183733648827", kill_on_drop: false }`
[INFO] [stdout] 4331bcf8457e9c885e7c17f33f1672f2224eafd887f891de1e2f183733648827
[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] d2cadef61314ab974590fbe1f8d3c7226e056d9fb86e14a55bb800d673964b8b
[INFO] running `Command { std: "docker" "start" "-a" "d2cadef61314ab974590fbe1f8d3c7226e056d9fb86e14a55bb800d673964b8b", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.17
[INFO] [stderr]     Checking same-file v1.0.4
[INFO] [stderr]     Checking regex-syntax v0.7.2
[INFO] [stderr]     Checking once_cell v1.5.2
[INFO] [stderr]     Checking home v0.5.3
[INFO] [stderr]     Checking aho-corasick v1.0.1
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking regex v1.8.3
[INFO] [stderr]     Checking toolchain_find v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `toolchain_find` is imported redundantly
[INFO] [stdout]  --> tests/integration.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use toolchain_find;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^ the item `toolchain_find` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.76s
[INFO] running `Command { std: "docker" "inspect" "d2cadef61314ab974590fbe1f8d3c7226e056d9fb86e14a55bb800d673964b8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2cadef61314ab974590fbe1f8d3c7226e056d9fb86e14a55bb800d673964b8b", kill_on_drop: false }`
[INFO] [stdout] d2cadef61314ab974590fbe1f8d3c7226e056d9fb86e14a55bb800d673964b8b
[INFO] checking toolchain_find-0.4.0 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate toolchain_find 0.4.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate toolchain_find 0.4.0 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 toolchain_find 0.4.0
[INFO] finished tweaking crates.io crate toolchain_find 0.4.0
[INFO] tweaked toml for crates.io crate toolchain_find 0.4.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate toolchain_find 0.4.0 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] e52b50219e94af814e50fb17c6a1aa6299c698a2cc06f070c7bf33e68595a2b3
[INFO] running `Command { std: "docker" "start" "-a" "e52b50219e94af814e50fb17c6a1aa6299c698a2cc06f070c7bf33e68595a2b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e52b50219e94af814e50fb17c6a1aa6299c698a2cc06f070c7bf33e68595a2b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e52b50219e94af814e50fb17c6a1aa6299c698a2cc06f070c7bf33e68595a2b3", kill_on_drop: false }`
[INFO] [stdout] e52b50219e94af814e50fb17c6a1aa6299c698a2cc06f070c7bf33e68595a2b3
[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] d062fe27a0ced848abfae6a94ab0a33ffc9ebdd719a584351828995ee64e233b
[INFO] running `Command { std: "docker" "start" "-a" "d062fe27a0ced848abfae6a94ab0a33ffc9ebdd719a584351828995ee64e233b", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.17
[INFO] [stderr]     Checking same-file v1.0.4
[INFO] [stderr]     Checking regex-syntax v0.7.2
[INFO] [stderr]     Checking once_cell v1.5.2
[INFO] [stderr]     Checking home v0.5.3
[INFO] [stderr]     Checking memchr v2.5.0
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking aho-corasick v1.0.1
[INFO] [stderr]     Checking regex v1.8.3
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/regex-1.8.3/src/exec.rs:899:13
[INFO] [stdout]     |
[INFO] [stdout] 899 | /             match dfa::Fsm::reverse(
[INFO] [stdout] 900 | |                 &self.ro.dfa_reverse,
[INFO] [stdout] 901 | |                 self.cache.value(),
[INFO] [stdout] 902 | |                 false,
[INFO] [stdout] ...   |
[INFO] [stdout] 913 | |                 Quit => return Some(Quit),
[INFO] [stdout] 914 | |             };
[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" "d062fe27a0ced848abfae6a94ab0a33ffc9ebdd719a584351828995ee64e233b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d062fe27a0ced848abfae6a94ab0a33ffc9ebdd719a584351828995ee64e233b", kill_on_drop: false }`
[INFO] [stdout] d062fe27a0ced848abfae6a94ab0a33ffc9ebdd719a584351828995ee64e233b