[INFO] fetching crate bulls-and-cows 1.0.21...
[INFO] checking bulls-and-cows-1.0.21 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate bulls-and-cows 1.0.21 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate bulls-and-cows 1.0.21 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 bulls-and-cows 1.0.21
[INFO] finished tweaking crates.io crate bulls-and-cows 1.0.21
[INFO] tweaked toml for crates.io crate bulls-and-cows 1.0.21 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate bulls-and-cows 1.0.21 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 random-pick v1.2.16
[INFO] [stderr]   Downloaded debug-helper v0.3.13
[INFO] [stderr]   Downloaded random-number-macro-impl v0.1.7
[INFO] [stderr]   Downloaded permutohedron v0.2.4
[INFO] [stderr]   Downloaded random-number v0.1.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 5917dfd173fd96671027044538385234088f134ffb109e88b181eaca0891b7da
[INFO] running `Command { std: "docker" "start" "-a" "5917dfd173fd96671027044538385234088f134ffb109e88b181eaca0891b7da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5917dfd173fd96671027044538385234088f134ffb109e88b181eaca0891b7da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5917dfd173fd96671027044538385234088f134ffb109e88b181eaca0891b7da", kill_on_drop: false }`
[INFO] [stdout] 5917dfd173fd96671027044538385234088f134ffb109e88b181eaca0891b7da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 25968b4dc42a583d4a1181d923ad7db70c3e0e598bff233bb47c36e15331edf4
[INFO] running `Command { std: "docker" "start" "-a" "25968b4dc42a583d4a1181d923ad7db70c3e0e598bff233bb47c36e15331edf4", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling unicode-ident v1.0.11
[INFO] [stderr]     Checking memchr v2.6.3
[INFO] [stderr]     Checking debug-helper v0.3.13
[INFO] [stderr]     Checking permutohedron v0.2.4
[INFO] [stderr]     Checking aho-corasick v1.0.5
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]    Compiling syn v2.0.31
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking regex-automata v0.3.8
[INFO] [stderr]     Checking regex v1.9.5
[INFO] [stderr]    Compiling random-number-macro-impl v0.1.7
[INFO] [stderr]     Checking random-number v0.1.8
[INFO] [stderr]     Checking random-pick v1.2.16
[INFO] [stderr]     Checking bulls-and-cows v1.0.21 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `random_pick` is imported redundantly
[INFO] [stdout]  --> src/play/players/computer.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use random_pick;
[INFO] [stdout]   |     ^^^^^^^^^^^ the item `random_pick` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `random_pick` is imported redundantly
[INFO] [stdout]  --> src/play/players/computer.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use random_pick;
[INFO] [stdout]   |     ^^^^^^^^^^^ the item `random_pick` 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] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.28s
[INFO] running `Command { std: "docker" "inspect" "25968b4dc42a583d4a1181d923ad7db70c3e0e598bff233bb47c36e15331edf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25968b4dc42a583d4a1181d923ad7db70c3e0e598bff233bb47c36e15331edf4", kill_on_drop: false }`
[INFO] [stdout] 25968b4dc42a583d4a1181d923ad7db70c3e0e598bff233bb47c36e15331edf4
[INFO] checking bulls-and-cows-1.0.21 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate bulls-and-cows 1.0.21 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate bulls-and-cows 1.0.21 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 bulls-and-cows 1.0.21
[INFO] finished tweaking crates.io crate bulls-and-cows 1.0.21
[INFO] tweaked toml for crates.io crate bulls-and-cows 1.0.21 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate crates.io crate bulls-and-cows 1.0.21 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 83bbc6701da1e35f86cb30c72987a78740f0a227cb84b142123a57f3e9ab7fe2
[INFO] running `Command { std: "docker" "start" "-a" "83bbc6701da1e35f86cb30c72987a78740f0a227cb84b142123a57f3e9ab7fe2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "83bbc6701da1e35f86cb30c72987a78740f0a227cb84b142123a57f3e9ab7fe2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83bbc6701da1e35f86cb30c72987a78740f0a227cb84b142123a57f3e9ab7fe2", kill_on_drop: false }`
[INFO] [stdout] 83bbc6701da1e35f86cb30c72987a78740f0a227cb84b142123a57f3e9ab7fe2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] bd864858dc73a478409110a14f5430c2cbf5ef92b3f43a6d82aa9ca3f036f036
[INFO] running `Command { std: "docker" "start" "-a" "bd864858dc73a478409110a14f5430c2cbf5ef92b3f43a6d82aa9ca3f036f036", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling unicode-ident v1.0.11
[INFO] [stderr]    Compiling proc-macro-hack v0.5.20+deprecated
[INFO] [stderr]     Checking memchr v2.6.3
[INFO] [stderr]     Checking debug-helper v0.3.13
[INFO] [stderr]     Checking permutohedron v0.2.4
[INFO] [stderr]     Checking aho-corasick v1.0.5
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]    Compiling syn v2.0.31
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking regex-automata v0.3.8
[INFO] [stderr]     Checking regex v1.9.5
[INFO] [stderr]    Compiling random-number-macro-impl v0.1.7
[INFO] [stderr]     Checking random-number v0.1.8
[INFO] [stderr]     Checking random-pick v1.2.16
[INFO] [stderr]     Checking bulls-and-cows v1.0.21 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `random_pick` is imported redundantly
[INFO] [stdout]  --> src/play/players/computer.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use random_pick;
[INFO] [stdout]   |     ^^^^^^^^^^^ the item `random_pick` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `random_pick` is imported redundantly
[INFO] [stdout]  --> src/play/players/computer.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use random_pick;
[INFO] [stdout]   |     ^^^^^^^^^^^ the item `random_pick` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0284]: type annotations needed: cannot satisfy `_ -> _`
[INFO] [stdout]   --> src/host.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 | ...   debug_helper::impl_debug_for_enum!(HostError::{LettersEmpty, AnswerLengthIncorrect, (AnswerContainsIncorrectLetter(_): (let .0 = "AnswerContainsIncorrectLetter")), (AnswerContainsDuplicatedLetter(_): (let .0 = "AnswerContainsDuplicatedLetter"))}, f, sel...
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot satisfy `_ -> _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `debug_helper::impl_debug_for_enum` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0284]: type annotations needed: cannot satisfy `_ -> _`
[INFO] [stdout]   --> src/host.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 | ...   debug_helper::impl_debug_for_enum!(HostError::{LettersEmpty, AnswerLengthIncorrect, (AnswerContainsIncorrectLetter(_): (let .0 = "AnswerContainsIncorrectLetter")), (AnswerContainsDuplicatedLetter(_): (let .0 = "AnswerContainsDuplicatedLetter"))}, f, sel...
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot satisfy `_ -> _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `debug_helper::impl_debug_for_enum` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0284`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0284`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bulls-and-cows` (lib) due to 2 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `bulls-and-cows` (lib test) due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "bd864858dc73a478409110a14f5430c2cbf5ef92b3f43a6d82aa9ca3f036f036", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd864858dc73a478409110a14f5430c2cbf5ef92b3f43a6d82aa9ca3f036f036", kill_on_drop: false }`
[INFO] [stdout] bd864858dc73a478409110a14f5430c2cbf5ef92b3f43a6d82aa9ca3f036f036