[INFO] updating cached repository https://github.com/nekokuro0xf/workerpool
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ab5f095836f1c52147f6192e65831325f54272c5
[INFO] testing nekokuro0xf/workerpool against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnekokuro0xf%2Fworkerpool" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nekokuro0xf/workerpool on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/nekokuro0xf/workerpool
[INFO] finished tweaking git repo https://github.com/nekokuro0xf/workerpool
[INFO] tweaked toml for git repo https://github.com/nekokuro0xf/workerpool written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/nekokuro0xf/workerpool already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a242dfbc400d8ff0c6f207aad049dd6f37969bcb84d916578d83e878599fe6ea
[INFO] running `"docker" "start" "-a" "a242dfbc400d8ff0c6f207aad049dd6f37969bcb84d916578d83e878599fe6ea"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.44
[INFO] [stderr]    Compiling bumpalo v2.4.1
[INFO] [stderr]    Compiling serde v1.0.91
[INFO] [stderr]    Compiling wasm-bindgen v0.2.44
[INFO] [stderr]    Compiling stdweb-internal-runtime v0.1.4
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling backtrace v0.3.17
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling stdweb v0.4.17
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling env_logger v0.6.1
[INFO] [stderr]    Compiling weedle v0.8.0
[INFO] [stderr]    Compiling serde_json v1.0.39
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.44
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.44
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling serde_derive v1.0.91
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.44
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling wasm-bindgen-webidl v0.2.44
[INFO] [stderr]    Compiling js-sys v0.3.21
[INFO] [stderr]    Compiling web-sys v0.3.21
[INFO] [stderr]    Compiling stdweb-derive v0.5.1
[INFO] [stderr]    Compiling stdweb-internal-macros v0.2.7
[INFO] [stderr]    Compiling rust_wasm_workerpool v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `std::ops::Try`)
[INFO] [stderr]   --> src/main.rs:27:24
[INFO] [stderr]    |
[INFO] [stderr] 15 | / pub fn main() {
[INFO] [stderr] 16 | |     let message = "Hello, 世界!";
[INFO] [stderr] 17 | |     js! {
[INFO] [stderr] 18 | |         // alert( @{message} );
[INFO] [stderr] ...  |
[INFO] [stderr] 27 | |     let mut  worker  = Worker::new("./worker.js")?;
[INFO] [stderr]    | |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot use the `?` operator in a function that returns `()`
[INFO] [stderr] ...  |
[INFO] [stderr] 33 | |
[INFO] [stderr] 34 | | }
[INFO] [stderr]    | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::ops::Try` is not implemented for `()`
[INFO] [stderr]    = note: required by `std::ops::Try::from_error`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: could not compile `rust_wasm_workerpool`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a242dfbc400d8ff0c6f207aad049dd6f37969bcb84d916578d83e878599fe6ea"`
[INFO] running `"docker" "rm" "-f" "a242dfbc400d8ff0c6f207aad049dd6f37969bcb84d916578d83e878599fe6ea"`
[INFO] [stdout] a242dfbc400d8ff0c6f207aad049dd6f37969bcb84d916578d83e878599fe6ea