[INFO] cloning repository https://github.com/hawkw/mnemosyne
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hawkw/mnemosyne" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhawkw%2Fmnemosyne", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhawkw%2Fmnemosyne'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 02d777d037b58343911ab34898e37b77db50b55b
[INFO] checking hawkw/mnemosyne against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhawkw%2Fmnemosyne" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hawkw/mnemosyne on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hawkw/mnemosyne
[INFO] finished tweaking git repo https://github.com/hawkw/mnemosyne
[INFO] tweaked toml for git repo https://github.com/hawkw/mnemosyne written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/hawkw/mnemosyne 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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded log v0.3.2
[INFO] [stderr]   Downloaded strsim v0.4.0
[INFO] [stderr]   Downloaded bitflags v0.3.2
[INFO] [stderr]   Downloaded libc v0.1.10
[INFO] [stderr]   Downloaded ansi_term v0.6.3
[INFO] [stderr]   Downloaded clap v1.4.5
[INFO] [stderr]   Downloaded combine v1.0.2
[INFO] [stderr]   Downloaded itertools v0.4.2
[INFO] [stderr]   Downloaded combine-language v0.7.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2fe76eda469c8db9756b059ddce31e4cb91d24e0ae2ed4822ba7fd08461bf823
[INFO] running `Command { std: "docker" "start" "-a" "2fe76eda469c8db9756b059ddce31e4cb91d24e0ae2ed4822ba7fd08461bf823", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2fe76eda469c8db9756b059ddce31e4cb91d24e0ae2ed4822ba7fd08461bf823", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2fe76eda469c8db9756b059ddce31e4cb91d24e0ae2ed4822ba7fd08461bf823", kill_on_drop: false }`
[INFO] [stdout] 2fe76eda469c8db9756b059ddce31e4cb91d24e0ae2ed4822ba7fd08461bf823
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f9651f7e927dab073d1b2f83bfb9408ac2d56945c159e518785a9a4ec822943d
[INFO] running `Command { std: "docker" "start" "-a" "f9651f7e927dab073d1b2f83bfb9408ac2d56945c159e518785a9a4ec822943d", kill_on_drop: false }`
[INFO] [stderr]     Checking combine v1.0.2
[INFO] [stderr]    Compiling mnemosyne v0.1.0 (/opt/rustwide/workdir/core)
[INFO] [stderr]     Checking libc v0.1.10
[INFO] [stderr]     Checking itertools v0.4.2
[INFO] [stderr]     Checking strsim v0.4.0
[INFO] [stderr]     Checking ansi_term v0.6.3
[INFO] [stderr]     Checking bitflags v0.3.2
[INFO] [stdout] error[E0601]: `main` function not found in crate `build_script_build`
[INFO] [stdout]   --> core/build.rs:36:6
[INFO] [stdout]    |
[INFO] [stdout] 36 | // }
[INFO] [stdout]    |      ^ consider adding a `main` function to `core/build.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 `mnemosyne` (build script) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "f9651f7e927dab073d1b2f83bfb9408ac2d56945c159e518785a9a4ec822943d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9651f7e927dab073d1b2f83bfb9408ac2d56945c159e518785a9a4ec822943d", kill_on_drop: false }`
[INFO] [stdout] f9651f7e927dab073d1b2f83bfb9408ac2d56945c159e518785a9a4ec822943d