[INFO] fetching crate kaf 1.0.2...
[INFO] checking kaf-1.0.2 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate kaf 1.0.2 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate kaf 1.0.2
[INFO] finished tweaking crates.io crate kaf 1.0.2
[INFO] tweaked toml for crates.io crate kaf 1.0.2 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate kaf 1.0.2 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 crates.io crate kaf 1.0.2 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 }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7ba44fc1b7937369bd7b05a3f792e19355265f8b516799b7b866626f5bfa98aa
[INFO] running `Command { std: "docker" "start" "-a" "7ba44fc1b7937369bd7b05a3f792e19355265f8b516799b7b866626f5bfa98aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ba44fc1b7937369bd7b05a3f792e19355265f8b516799b7b866626f5bfa98aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ba44fc1b7937369bd7b05a3f792e19355265f8b516799b7b866626f5bfa98aa", kill_on_drop: false }`
[INFO] [stdout] 7ba44fc1b7937369bd7b05a3f792e19355265f8b516799b7b866626f5bfa98aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 }`
[INFO] [stdout] 1ebf7adbeafcbf54c97e7c9924ef32165376d3e208c1b7000da2d9996dcb57b1
[INFO] running `Command { std: "docker" "start" "-a" "1ebf7adbeafcbf54c97e7c9924ef32165376d3e208c1b7000da2d9996dcb57b1", kill_on_drop: false }`
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking kaf v1.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]  --> examples/result.rs:9:40
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let ok: Result<&str, Infallible> = Ok("ok");
[INFO] [stdout]   |                                        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]   --> examples/result.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 |     log::trace!("{:?}", ok);
[INFO] [stdout]    |                         ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]   --> examples/result.rs:13:25
[INFO] [stdout]    |
[INFO] [stdout] 13 |     log::debug!("{:?}", ok);
[INFO] [stdout]    |                         ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]   --> examples/result.rs:14:24
[INFO] [stdout]    |
[INFO] [stdout] 14 |     log::info!("{:?}", ok);
[INFO] [stdout]    |                        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]   --> examples/result.rs:15:24
[INFO] [stdout]    |
[INFO] [stdout] 15 |     log::warn!("{:?}", ok);
[INFO] [stdout]    |                        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kaf` (example "result") due to 5 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "1ebf7adbeafcbf54c97e7c9924ef32165376d3e208c1b7000da2d9996dcb57b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ebf7adbeafcbf54c97e7c9924ef32165376d3e208c1b7000da2d9996dcb57b1", kill_on_drop: false }`
[INFO] [stdout] 1ebf7adbeafcbf54c97e7c9924ef32165376d3e208c1b7000da2d9996dcb57b1