[INFO] cloning repository https://github.com/ben0x539/kilordlesolver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ben0x539/kilordlesolver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fben0x539%2Fkilordlesolver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fben0x539%2Fkilordlesolver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8a79c38fc76c5f098fa0d9b8c72948c297b73f61
[INFO] checking ben0x539/kilordlesolver against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fben0x539%2Fkilordlesolver" "/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/ben0x539/kilordlesolver on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ben0x539/kilordlesolver
[INFO] finished tweaking git repo https://github.com/ben0x539/kilordlesolver
[INFO] tweaked toml for git repo https://github.com/ben0x539/kilordlesolver written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ben0x539/kilordlesolver 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded owo-colors v3.3.0
[INFO] [stderr]   Downloaded eyre v0.6.7
[INFO] [stderr]   Downloaded tracing-subscriber v0.3.9
[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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 204c559a9149c0d6fef34bf50fad4edd99715bc3ba930dd0522a05710dac0896
[INFO] running `Command { std: "docker" "start" "-a" "204c559a9149c0d6fef34bf50fad4edd99715bc3ba930dd0522a05710dac0896", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "204c559a9149c0d6fef34bf50fad4edd99715bc3ba930dd0522a05710dac0896", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "204c559a9149c0d6fef34bf50fad4edd99715bc3ba930dd0522a05710dac0896", kill_on_drop: false }`
[INFO] [stdout] 204c559a9149c0d6fef34bf50fad4edd99715bc3ba930dd0522a05710dac0896
[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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1962874ae01df2a8b4632a2c90730f978e252de663dfb5dc221533fb70e18ef2
[INFO] running `Command { std: "docker" "start" "-a" "1962874ae01df2a8b4632a2c90730f978e252de663dfb5dc221533fb70e18ef2", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.121
[INFO] [stderr]     Checking once_cell v1.10.0
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]     Checking pin-project-lite v0.2.8
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]    Compiling eyre v0.6.7
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]     Checking indenter v0.3.3
[INFO] [stderr]     Checking owo-colors v3.3.0
[INFO] [stderr]     Checking tracing-core v0.1.23
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]     Checking sharded-slab v0.1.4
[INFO] [stderr]    Compiling backtrace v0.3.64
[INFO] [stderr]     Checking thread_local v1.1.4
[INFO] [stderr]     Checking tracing v0.1.32
[INFO] [stderr]     Checking tracing-subscriber v0.3.9
[INFO] [stderr]     Checking object v0.27.1
[INFO] [stderr]     Checking getrandom v0.2.5
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking tracing-error v0.2.0
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking color-spantrace v0.2.0
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]     Checking color-eyre v0.6.1
[INFO] [stderr]     Checking kilordlesolver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:92:21
[INFO] [stdout]    |
[INFO] [stdout] 92 |                     tx.send(guesses);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 92 |                     let _ = tx.send(guesses);
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:92:21
[INFO] [stdout]    |
[INFO] [stdout] 92 |                     tx.send(guesses);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 92 |                     let _ = tx.send(guesses);
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.61s
[INFO] running `Command { std: "docker" "inspect" "1962874ae01df2a8b4632a2c90730f978e252de663dfb5dc221533fb70e18ef2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1962874ae01df2a8b4632a2c90730f978e252de663dfb5dc221533fb70e18ef2", kill_on_drop: false }`
[INFO] [stdout] 1962874ae01df2a8b4632a2c90730f978e252de663dfb5dc221533fb70e18ef2
[INFO] checking ben0x539/kilordlesolver against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fben0x539%2Fkilordlesolver" "/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/ben0x539/kilordlesolver on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ben0x539/kilordlesolver
[INFO] finished tweaking git repo https://github.com/ben0x539/kilordlesolver
[INFO] tweaked toml for git repo https://github.com/ben0x539/kilordlesolver written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/ben0x539/kilordlesolver 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f59679d4e7bd3e94515e71b32ac8bb5586765fa2879e2926f5ee1aef4381f145
[INFO] running `Command { std: "docker" "start" "-a" "f59679d4e7bd3e94515e71b32ac8bb5586765fa2879e2926f5ee1aef4381f145", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f59679d4e7bd3e94515e71b32ac8bb5586765fa2879e2926f5ee1aef4381f145", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f59679d4e7bd3e94515e71b32ac8bb5586765fa2879e2926f5ee1aef4381f145", kill_on_drop: false }`
[INFO] [stdout] f59679d4e7bd3e94515e71b32ac8bb5586765fa2879e2926f5ee1aef4381f145
[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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6fcf29b3138fe72b889d6945066c9d858bbb36327b50d55dab382ee827a012bc
[INFO] running `Command { std: "docker" "start" "-a" "6fcf29b3138fe72b889d6945066c9d858bbb36327b50d55dab382ee827a012bc", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.121
[INFO] [stderr]     Checking once_cell v1.10.0
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]     Checking pin-project-lite v0.2.8
[INFO] [stderr]    Compiling eyre v0.6.7
[INFO] [stderr]     Checking tracing-core v0.1.23
[INFO] [stderr]     Checking sharded-slab v0.1.4
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling backtrace v0.3.64
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]     Checking indenter v0.3.3
[INFO] [stderr]     Checking owo-colors v3.3.0
[INFO] [stderr]     Checking thread_local v1.1.4
[INFO] [stderr]     Checking tracing v0.1.32
[INFO] [stderr]     Checking tracing-subscriber v0.3.9
[INFO] [stderr]     Checking getrandom v0.2.5
[INFO] [stderr]     Checking object v0.27.1
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking tracing-error v0.2.0
[INFO] [stderr]     Checking color-spantrace v0.2.0
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]     Checking color-eyre v0.6.1
[INFO] [stderr]     Checking kilordlesolver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:92:21
[INFO] [stdout]    |
[INFO] [stdout] 92 |                     tx.send(guesses);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 92 |                     let _ = tx.send(guesses);
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:92:21
[INFO] [stdout]    |
[INFO] [stdout] 92 |                     tx.send(guesses);
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 92 |                     let _ = tx.send(guesses);
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.21s
[INFO] running `Command { std: "docker" "inspect" "6fcf29b3138fe72b889d6945066c9d858bbb36327b50d55dab382ee827a012bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fcf29b3138fe72b889d6945066c9d858bbb36327b50d55dab382ee827a012bc", kill_on_drop: false }`
[INFO] [stdout] 6fcf29b3138fe72b889d6945066c9d858bbb36327b50d55dab382ee827a012bc