[INFO] updating cached repository https://github.com/inner-product/mdbook-scala-wrapper
[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] 820d617c502e9ca3d36c38fe4351d4192b29b806
[INFO] checking inner-product/mdbook-scala-wrapper against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finner-product%2Fmdbook-scala-wrapper" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/inner-product/mdbook-scala-wrapper on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/inner-product/mdbook-scala-wrapper
[INFO] finished tweaking git repo https://github.com/inner-product/mdbook-scala-wrapper
[INFO] tweaked toml for git repo https://github.com/inner-product/mdbook-scala-wrapper written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/inner-product/mdbook-scala-wrapper already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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=forbid" "-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" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b585cf3a60c4bc81a5c751535c9c952dccb54ccd28109e3e3f53559c61124ae1
[INFO] running `"docker" "start" "-a" "b585cf3a60c4bc81a5c751535c9c952dccb54ccd28109e3e3f53559c61124ae1"`
[INFO] [stderr]     Checking getopts v0.2.18
[INFO] [stderr]    Compiling serde_json v1.0.32
[INFO] [stderr]     Checking tempfile v3.0.4
[INFO] [stderr]    Compiling syn v0.15.12
[INFO] [stderr]     Checking hyper v0.10.13
[INFO] [stderr]     Checking ws v0.7.9
[INFO] [stderr]    Compiling strum_macros v0.9.1
[INFO] [stderr]     Checking error-chain v0.12.0
[INFO] [stderr]    Compiling string_cache_codegen v0.4.1
[INFO] [stderr]     Checking handlebars v1.0.5
[INFO] [stderr]     Checking toml-query v0.7.0
[INFO] [stderr]    Compiling mime_guess v1.8.6
[INFO] [stderr]     Checking pulldown-cmark v0.1.2
[INFO] [stderr]    Compiling string_cache v0.7.3
[INFO] [stderr] error[E0277]: cannot add `&std::borrow::Cow<'_, str>` to `std::string::String`
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/pulldown-cmark-0.1.2/src/utils.rs:51:30
[INFO] [stderr]    |
[INFO] [stderr] 51 |         Owned(a.into_owned() + &b)
[INFO] [stderr]    |                              ^ no implementation for `std::string::String + &std::borrow::Cow<'_, str>`
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::ops::Add<&std::borrow::Cow<'_, str>>` is not implemented for `std::string::String`
[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 `pulldown-cmark`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "b585cf3a60c4bc81a5c751535c9c952dccb54ccd28109e3e3f53559c61124ae1"`
[INFO] running `"docker" "rm" "-f" "b585cf3a60c4bc81a5c751535c9c952dccb54ccd28109e3e3f53559c61124ae1"`
[INFO] [stdout] b585cf3a60c4bc81a5c751535c9c952dccb54ccd28109e3e3f53559c61124ae1