[INFO] fetching crate displayz 0.1.0...
[INFO] checking displayz-0.1.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate displayz 0.1.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate displayz 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 displayz 0.1.0
[INFO] finished tweaking crates.io crate displayz 0.1.0
[INFO] tweaked toml for crates.io crate displayz 0.1.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate displayz 0.1.0 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]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded owo-colors v3.4.0
[INFO] [stderr]   Downloaded backtrace v0.3.65
[INFO] [stderr]   Downloaded winsafe v0.0.10
[INFO] [stderr]   Downloaded color-eyre v0.6.1
[INFO] [stderr]   Downloaded gimli v0.26.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 2df8dfd94fff0955638f93c55fd7e3ef32914d627295b6c0d262a6cf5589f504
[INFO] running `Command { std: "docker" "start" "-a" "2df8dfd94fff0955638f93c55fd7e3ef32914d627295b6c0d262a6cf5589f504", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2df8dfd94fff0955638f93c55fd7e3ef32914d627295b6c0d262a6cf5589f504", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2df8dfd94fff0955638f93c55fd7e3ef32914d627295b6c0d262a6cf5589f504", kill_on_drop: false }`
[INFO] [stdout] 2df8dfd94fff0955638f93c55fd7e3ef32914d627295b6c0d262a6cf5589f504
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] cb404c08259aa3ec4c91e2db7460ee04012def319de9b4fc721e326d61175f97
[INFO] running `Command { std: "docker" "start" "-a" "cb404c08259aa3ec4c91e2db7460ee04012def319de9b4fc721e326d61175f97", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling syn v1.0.96
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking tracing-core v0.1.26
[INFO] [stderr]     Checking sharded-slab v0.1.4
[INFO] [stderr]    Compiling eyre v0.6.8
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking object v0.28.4
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]     Checking miniz_oxide v0.5.3
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking thread_local v1.1.4
[INFO] [stderr]     Checking owo-colors v3.4.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking regex-syntax v0.6.26
[INFO] [stderr]     Checking tracing v0.1.34
[INFO] [stderr]     Checking indenter v0.3.3
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking humantime v2.1.0
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]     Checking winsafe v0.0.10
[INFO] [stderr]     Checking tracing-subscriber v0.3.11
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling backtrace v0.3.65
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking regex v1.5.6
[INFO] [stderr]     Checking tracing-error v0.2.0
[INFO] [stderr]     Checking color-spantrace v0.2.0
[INFO] [stderr]     Checking env_logger v0.9.0
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking color-eyre v0.6.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.31
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking thiserror v1.0.31
[INFO] [stderr]     Checking structopt v0.3.26
[INFO] [stderr]     Checking displayz v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/upside-down.rs:10:17
[INFO] [stdout]    |
[INFO] [stdout] 10 |             let mut settings = &mut *settings.borrow_mut();
[INFO] [stdout]    |                 ----^^^^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` 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 4.42s
[INFO] running `Command { std: "docker" "inspect" "cb404c08259aa3ec4c91e2db7460ee04012def319de9b4fc721e326d61175f97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb404c08259aa3ec4c91e2db7460ee04012def319de9b4fc721e326d61175f97", kill_on_drop: false }`
[INFO] [stdout] cb404c08259aa3ec4c91e2db7460ee04012def319de9b4fc721e326d61175f97