[INFO] fetching crate fw_env 0.1.0...
[INFO] checking fw_env-0.1.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate fw_env 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate fw_env 0.1.0 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 fw_env 0.1.0
[INFO] finished tweaking crates.io crate fw_env 0.1.0
[INFO] tweaked toml for crates.io crate fw_env 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 12 packages
[INFO] [stderr]       Adding aho-corasick v0.6.10 (latest: v1.1.3)
[INFO] [stderr]       Adding crc v1.8.1 (latest: v3.0.1)
[INFO] [stderr]       Adding regex v0.2.11 (latest: v1.10.4)
[INFO] [stderr]       Adding regex-syntax v0.5.6 (latest: v0.8.3)
[INFO] [stderr]       Adding scan_fmt v0.1.3 (latest: v0.2.6)
[INFO] [stderr]       Adding thread_local v0.3.6 (latest: v1.1.8)
[INFO] [stderr]       Adding ucd-util v0.1.10 (latest: v0.2.1)
[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 scan_fmt v0.1.3
[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] d11a8aa32275339d952fa2ce93b490f4bac0295b0f1a761c5bfaf2d9d26839f8
[INFO] running `Command { std: "docker" "start" "-a" "d11a8aa32275339d952fa2ce93b490f4bac0295b0f1a761c5bfaf2d9d26839f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d11a8aa32275339d952fa2ce93b490f4bac0295b0f1a761c5bfaf2d9d26839f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d11a8aa32275339d952fa2ce93b490f4bac0295b0f1a761c5bfaf2d9d26839f8", kill_on_drop: false }`
[INFO] [stdout] d11a8aa32275339d952fa2ce93b490f4bac0295b0f1a761c5bfaf2d9d26839f8
[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] fd6b7f48204f7304c6bedb5b437c8c7c8bb8b3b9e2ab57885e7c6d211da5d17b
[INFO] running `Command { std: "docker" "start" "-a" "fd6b7f48204f7304c6bedb5b437c8c7c8bb8b3b9e2ab57885e7c6d211da5d17b", kill_on_drop: false }`
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling build_const v0.2.2
[INFO] [stderr]     Checking ucd-util v0.1.10
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]     Checking utf8-ranges v1.0.5
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking scan_fmt v0.1.3
[INFO] [stderr]     Checking fw_env v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.55s
[INFO] running `Command { std: "docker" "inspect" "fd6b7f48204f7304c6bedb5b437c8c7c8bb8b3b9e2ab57885e7c6d211da5d17b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd6b7f48204f7304c6bedb5b437c8c7c8bb8b3b9e2ab57885e7c6d211da5d17b", kill_on_drop: false }`
[INFO] [stdout] fd6b7f48204f7304c6bedb5b437c8c7c8bb8b3b9e2ab57885e7c6d211da5d17b
[INFO] checking fw_env-0.1.0 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate fw_env 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate fw_env 0.1.0 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 fw_env 0.1.0
[INFO] finished tweaking crates.io crate fw_env 0.1.0
[INFO] tweaked toml for crates.io crate fw_env 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[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] 8ad3d89d3f6b9252b0c1a144fc1eaf3431efa97e0dbb1720feef6e9022484dd6
[INFO] running `Command { std: "docker" "start" "-a" "8ad3d89d3f6b9252b0c1a144fc1eaf3431efa97e0dbb1720feef6e9022484dd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8ad3d89d3f6b9252b0c1a144fc1eaf3431efa97e0dbb1720feef6e9022484dd6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ad3d89d3f6b9252b0c1a144fc1eaf3431efa97e0dbb1720feef6e9022484dd6", kill_on_drop: false }`
[INFO] [stdout] 8ad3d89d3f6b9252b0c1a144fc1eaf3431efa97e0dbb1720feef6e9022484dd6
[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] 2d2dd8816305effa94754a05bf6293c3760d82010bdf9b424d5d21768d734142
[INFO] running `Command { std: "docker" "start" "-a" "2d2dd8816305effa94754a05bf6293c3760d82010bdf9b424d5d21768d734142", kill_on_drop: false }`
[INFO] [stderr]     Checking ucd-util v0.1.10
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling build_const v0.2.2
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]     Checking utf8-ranges v1.0.5
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/regex-0.2.11/src/exec.rs:756:13
[INFO] [stdout]     |
[INFO] [stdout] 756 | /             match dfa::Fsm::reverse(
[INFO] [stdout] 757 | |                 &self.ro.dfa_reverse,
[INFO] [stdout] 758 | |                 self.cache,
[INFO] [stdout] 759 | |                 false,
[INFO] [stdout] ...   |
[INFO] [stdout] 766 | |                 Quit => return Some(Quit),
[INFO] [stdout] 767 | |             };
[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" "2d2dd8816305effa94754a05bf6293c3760d82010bdf9b424d5d21768d734142", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d2dd8816305effa94754a05bf6293c3760d82010bdf9b424d5d21768d734142", kill_on_drop: false }`
[INFO] [stdout] 2d2dd8816305effa94754a05bf6293c3760d82010bdf9b424d5d21768d734142