[INFO] crate papers 0.1.0 is already in cache
[INFO] checking papers-0.1.0 against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] extracting crate papers 0.1.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate papers 0.1.0 on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate papers 0.1.0
[INFO] finished tweaking crates.io crate papers 0.1.0
[INFO] tweaked toml for crates.io crate papers 0.1.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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] eea1cd62b9ef930587fcf03a6ae136ad1453f6b302f63c429f403d76a7538f69
[INFO] running `"docker" "start" "-a" "eea1cd62b9ef930587fcf03a6ae136ad1453f6b302f63c429f403d76a7538f69"`
[INFO] [stderr]     Checking xmlparser v0.9.0
[INFO] [stderr]    Compiling curl-sys v0.4.24
[INFO] [stderr]     Checking num-integer v0.1.41
[INFO] [stderr]     Checking uuid v0.7.4
[INFO] [stderr]     Checking serde-hjson v0.8.2
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking multimap v0.4.0
[INFO] [stderr]     Checking cookie_store v0.7.0
[INFO] [stderr]     Checking cookie_store v0.6.0
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking roxmltree v0.6.1
[INFO] [stderr] error[E0284]: type annotations needed: cannot resolve `<std::string::String as std::ops::Add<&_>>::Output == std::string::String`
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/roxmltree-0.6.1/src/parse.rs:706:71
[INFO] [stderr]     |
[INFO] [stderr] 706 |                         *prev_text = Cow::Owned(prev_text.to_string() + text.borrow());
[INFO] [stderr]     |                                                                       ^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0284`.
[INFO] [stderr] error: could not compile `roxmltree`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "eea1cd62b9ef930587fcf03a6ae136ad1453f6b302f63c429f403d76a7538f69"`
[INFO] running `"docker" "rm" "-f" "eea1cd62b9ef930587fcf03a6ae136ad1453f6b302f63c429f403d76a7538f69"`
[INFO] [stdout] eea1cd62b9ef930587fcf03a6ae136ad1453f6b302f63c429f403d76a7538f69