[INFO] fetching crate buttons 0.3.1...
[INFO] checking buttons-0.3.1 against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] extracting crate buttons 0.3.1 into /workspace/builds/worker-51/source
[INFO] validating manifest of crates.io crate buttons 0.3.1 on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate buttons 0.3.1
[INFO] finished tweaking crates.io crate buttons 0.3.1
[INFO] tweaked toml for crates.io crate buttons 0.3.1 written to /workspace/builds/worker-51/source/Cargo.toml
[INFO] crate crates.io crate buttons 0.3.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4c6d50f5a7dcd2f5bd7585be8ad100c396e9fceaa83489be24a0240b4c2ee040
[INFO] running `Command { std: "docker" "start" "-a" "4c6d50f5a7dcd2f5bd7585be8ad100c396e9fceaa83489be24a0240b4c2ee040", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c6d50f5a7dcd2f5bd7585be8ad100c396e9fceaa83489be24a0240b4c2ee040", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c6d50f5a7dcd2f5bd7585be8ad100c396e9fceaa83489be24a0240b4c2ee040", kill_on_drop: false }`
[INFO] [stdout] 4c6d50f5a7dcd2f5bd7585be8ad100c396e9fceaa83489be24a0240b4c2ee040
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cbf192522119c171e089e18ea4ba58523d616ebd156e38c6ce691c7cf498090d
[INFO] running `Command { std: "docker" "start" "-a" "cbf192522119c171e089e18ea4ba58523d616ebd156e38c6ce691c7cf498090d", kill_on_drop: false }`
[INFO] [stderr]     Checking buttons v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0601]: `main` function not found in crate `winit`
[INFO] [stdout]   --> examples/winit.rs:1:1
[INFO] [stdout]    |
[INFO] [stdout] 1  | / #![cfg(feature = "winit-support")]
[INFO] [stdout] 2  | |
[INFO] [stdout] 3  | | use winit::{
[INFO] [stdout] 4  | |     event::*,
[INFO] [stdout] ...  |
[INFO] [stdout] 54 | |     });
[INFO] [stdout] 55 | | }
[INFO] [stdout]    | |_^ consider adding a `main` function to `examples/winit.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `buttons` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "cbf192522119c171e089e18ea4ba58523d616ebd156e38c6ce691c7cf498090d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cbf192522119c171e089e18ea4ba58523d616ebd156e38c6ce691c7cf498090d", kill_on_drop: false }`
[INFO] [stdout] cbf192522119c171e089e18ea4ba58523d616ebd156e38c6ce691c7cf498090d