[INFO] cloning repository https://github.com/cm-kazup0n/omc [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cm-kazup0n/omc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcm-kazup0n%2Fomc", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcm-kazup0n%2Fomc'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 464205d5204b5c69ef850c7a7ab13ad92d8937f2 [INFO] testing cm-kazup0n/omc against 1.55.0 for beta-1.56-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcm-kazup0n%2Fomc" "/workspace/builds/worker-5/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/cm-kazup0n/omc on toolchain 1.55.0 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/cm-kazup0n/omc [INFO] finished tweaking git repo https://github.com/cm-kazup0n/omc [INFO] tweaked toml for git repo https://github.com/cm-kazup0n/omc written to /workspace/builds/worker-5/source/Cargo.toml [INFO] crate git repo https://github.com/cm-kazup0n/omc already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] cfa498a4f1fe6ebf332cef3a922fc29313b93014bd5d3d3cbfacba9b81d19211 [INFO] running `Command { std: "docker" "start" "-a" "cfa498a4f1fe6ebf332cef3a922fc29313b93014bd5d3d3cbfacba9b81d19211", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "cfa498a4f1fe6ebf332cef3a922fc29313b93014bd5d3d3cbfacba9b81d19211", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "cfa498a4f1fe6ebf332cef3a922fc29313b93014bd5d3d3cbfacba9b81d19211", kill_on_drop: false }` [INFO] [stdout] cfa498a4f1fe6ebf332cef3a922fc29313b93014bd5d3d3cbfacba9b81d19211 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 5de9daf927fe3b6c969fcbd87729ee68de268da869f835864ae18b7d918019b9 [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "5de9daf927fe3b6c969fcbd87729ee68de268da869f835864ae18b7d918019b9", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.96 [INFO] [stderr] Compiling syn v1.0.73 [INFO] [stderr] Compiling dirs-sys v0.3.6 [INFO] [stderr] Compiling atty v0.2.14 [INFO] [stderr] Compiling clap v2.33.3 [INFO] [stderr] Compiling dirs v3.0.2 [INFO] [stderr] Compiling serde_derive v1.0.126 [INFO] [stderr] Compiling serde v1.0.126 [INFO] [stderr] Compiling toml v0.5.8 [INFO] [stderr] Compiling opc v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] error[E0277]: the `?` operator can only be used on `Option`s, not `Result`s, in a method that returns `Option` [INFO] [stdout] --> src/cache.rs:32:53 [INFO] [stdout] | [INFO] [stdout] 31 | / pub fn restore_cache(&self) -> Option { [INFO] [stdout] 32 | | let mut buf = Ok(BufReader::new(&self.file))?; [INFO] [stdout] | | ^ use `.ok()?` if you want to discard the `Result` error information [INFO] [stdout] 33 | | let mut line = String::new(); [INFO] [stdout] 34 | | buf.read_line(&mut line).ok()?; [INFO] [stdout] ... | [INFO] [stdout] 41 | | }; [INFO] [stdout] 42 | | } [INFO] [stdout] | |_____- this function returns an `Option` [INFO] [stdout] | [INFO] [stdout] = help: the trait `FromResidual>` is not implemented for `std::option::Option` [INFO] [stdout] note: required by `from_residual` [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 E0277`. [INFO] [stdout] [INFO] [stderr] error: could not compile `opc` due to 2 previous errors [INFO] running `Command { std: "docker" "inspect" "5de9daf927fe3b6c969fcbd87729ee68de268da869f835864ae18b7d918019b9", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5de9daf927fe3b6c969fcbd87729ee68de268da869f835864ae18b7d918019b9", kill_on_drop: false }` [INFO] [stdout] 5de9daf927fe3b6c969fcbd87729ee68de268da869f835864ae18b7d918019b9