[INFO] fetching crate buttons 0.3.1...
[INFO] checking buttons-0.3.1 against master#c5fbcd35a8217a17f6b63a22217ace06cf8f5f02 for pr-86194
[INFO] extracting crate buttons 0.3.1 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate buttons 0.3.1 on toolchain c5fbcd35a8217a17f6b63a22217ace06cf8f5f02
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "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-0/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" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1b3828a4f390ec3b20da6ef20ecc0e7c47244bb3d46b4a177eb9a4a25527d846
[INFO] running `Command { std: "docker" "start" "-a" "1b3828a4f390ec3b20da6ef20ecc0e7c47244bb3d46b4a177eb9a4a25527d846", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1b3828a4f390ec3b20da6ef20ecc0e7c47244bb3d46b4a177eb9a4a25527d846", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b3828a4f390ec3b20da6ef20ecc0e7c47244bb3d46b4a177eb9a4a25527d846", kill_on_drop: false }`
[INFO] [stdout] 1b3828a4f390ec3b20da6ef20ecc0e7c47244bb3d46b4a177eb9a4a25527d846
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dc30263a81ee4817bce2aaa5f9a40c25630bbda7893b67aab11b072a996a556b
[INFO] running `Command { std: "docker" "start" "-a" "dc30263a81ee4817bce2aaa5f9a40c25630bbda7893b67aab11b072a996a556b", 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`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "dc30263a81ee4817bce2aaa5f9a40c25630bbda7893b67aab11b072a996a556b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc30263a81ee4817bce2aaa5f9a40c25630bbda7893b67aab11b072a996a556b", kill_on_drop: false }`
[INFO] [stdout] dc30263a81ee4817bce2aaa5f9a40c25630bbda7893b67aab11b072a996a556b