[INFO] cloning repository https://github.com/obox-systems/formatter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/obox-systems/formatter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fobox-systems%2Fformatter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fobox-systems%2Fformatter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3fcf6cf3a79dcc7bc56ed10ae0f102ba7030a04f
[INFO] checking obox-systems/formatter against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fobox-systems%2Fformatter" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/obox-systems/formatter
[INFO] finished tweaking git repo https://github.com/obox-systems/formatter
[INFO] tweaked toml for git repo https://github.com/obox-systems/formatter written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/obox-systems/formatter on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/obox-systems/formatter 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "45721e55e4150f973195747efcdf6f2fc4ef94c9014f1ad6ef82932bafb67558", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `ident::Ident`
[INFO] [stdout]  --> src/plugins.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub use ident::Ident;
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ident::Ident`
[INFO] [stdout]  --> src/plugins.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub use ident::Ident;
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `negative` is never used
[INFO] [stdout]  --> src/core.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub(crate) trait Plugin {
[INFO] [stdout]   |                  ------ associated function in this trait
[INFO] [stdout] ...
[INFO] [stdout] 9 |     fn negative() -> Vec<&'static str> {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `negative` is never used
[INFO] [stdout]  --> src/core.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub(crate) trait Plugin {
[INFO] [stdout]   |                  ------ associated function in this trait
[INFO] [stdout] ...
[INFO] [stdout] 9 |     fn negative() -> Vec<&'static str> {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Ident` is never constructed
[INFO] [stdout]  --> src/plugins/ident.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Ident {}
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Ident` is never constructed
[INFO] [stdout]  --> src/plugins/ident.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Ident {}
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/bin/formatter.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     wca::parse_args!(args, path: PathBuf);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the macro `wca::parse_args` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `formatter` (bin "formatter") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/bin/formatter.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     wca::parse_args!(args, path: PathBuf);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout]    = note: this error originates in the macro `wca::parse_args` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `formatter` (bin "formatter" test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "39744ffc4bccf5415e88c42bfbb0d14944e5d933dc5c7a894399a77ff218cf89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39744ffc4bccf5415e88c42bfbb0d14944e5d933dc5c7a894399a77ff218cf89", kill_on_drop: false }`
[INFO] [stdout] 39744ffc4bccf5415e88c42bfbb0d14944e5d933dc5c7a894399a77ff218cf89