[INFO] cloning repository https://github.com/tyler-boyd/multigrep
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tyler-boyd/multigrep" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftyler-boyd%2Fmultigrep", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftyler-boyd%2Fmultigrep'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 32765e5ef905f1dbbd204dfa2713086bf2771716
[INFO] checking tyler-boyd/multigrep against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftyler-boyd%2Fmultigrep" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tyler-boyd/multigrep 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 git repo https://github.com/tyler-boyd/multigrep
[INFO] finished tweaking git repo https://github.com/tyler-boyd/multigrep
[INFO] tweaked toml for git repo https://github.com/tyler-boyd/multigrep written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/tyler-boyd/multigrep 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 structopt-derive v0.4.10
[INFO] [stderr]   Downloaded syn v1.0.39
[INFO] [stderr]   Downloaded structopt v0.3.17
[INFO] [stderr]   Downloaded signal-hook-registry v1.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] dccf4c0ef59d1600ab9f66f7ca2729a6aafe8e58d2943fe1cdb7d9baa5b31f0d
[INFO] running `Command { std: "docker" "start" "-a" "dccf4c0ef59d1600ab9f66f7ca2729a6aafe8e58d2943fe1cdb7d9baa5b31f0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dccf4c0ef59d1600ab9f66f7ca2729a6aafe8e58d2943fe1cdb7d9baa5b31f0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dccf4c0ef59d1600ab9f66f7ca2729a6aafe8e58d2943fe1cdb7d9baa5b31f0d", kill_on_drop: false }`
[INFO] [stdout] dccf4c0ef59d1600ab9f66f7ca2729a6aafe8e58d2943fe1cdb7d9baa5b31f0d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 88d99e05df0456bb01ea1f4ed2d0659a0e23c8ce05a0a5eb31b56f5699fe4b7a
[INFO] running `Command { std: "docker" "start" "-a" "88d99e05df0456bb01ea1f4ed2d0659a0e23c8ce05a0a5eb31b56f5699fe4b7a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]     Checking arc-swap v0.4.7
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking pin-project-lite v0.1.7
[INFO] [stderr]     Checking bytes v0.5.6
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking net2 v0.2.34
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking signal-hook-registry v1.2.1
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]    Compiling structopt-derive v0.4.10
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking structopt v0.3.17
[INFO] [stderr]     Checking multigrep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `file` is never read
[INFO] [stdout]   --> src/main.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 55 | struct Opt {
[INFO] [stdout]    |        --- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 64 |     file: Option<String>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Opt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `file` is never read
[INFO] [stdout]   --> src/main.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 55 | struct Opt {
[INFO] [stdout]    |        --- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 64 |     file: Option<String>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Opt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` 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 4.77s
[INFO] running `Command { std: "docker" "inspect" "88d99e05df0456bb01ea1f4ed2d0659a0e23c8ce05a0a5eb31b56f5699fe4b7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88d99e05df0456bb01ea1f4ed2d0659a0e23c8ce05a0a5eb31b56f5699fe4b7a", kill_on_drop: false }`
[INFO] [stdout] 88d99e05df0456bb01ea1f4ed2d0659a0e23c8ce05a0a5eb31b56f5699fe4b7a