[INFO] crate fastobo 0.7.4 is already in cache
[INFO] checking fastobo-0.7.4 against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] extracting crate fastobo 0.7.4 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate fastobo 0.7.4 on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate fastobo 0.7.4
[INFO] finished tweaking crates.io crate fastobo 0.7.4
[INFO] tweaked toml for crates.io crate fastobo 0.7.4 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate fastobo 0.7.4 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 169d7fed66cb89a3d6cc60b5273dc201674471a461cce46c45a4c270d4a7dd31
[INFO] running `"docker" "start" "-a" "169d7fed66cb89a3d6cc60b5273dc201674471a461cce46c45a4c270d4a7dd31"`
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling xmlparser v0.8.1
[INFO] [stderr]    Compiling indexmap v1.2.0
[INFO] [stderr]    Compiling strum v0.15.0
[INFO] [stderr]     Checking ascii v1.0.0
[INFO] [stderr]     Checking chunked_transfer v1.0.0
[INFO] [stderr]     Checking opaque_typedef v0.0.5
[INFO] [stderr]    Compiling ring v0.16.9
[INFO] [stderr]     Checking qstring v0.6.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]    Compiling err-derive v0.1.6
[INFO] [stderr]    Compiling roxmltree v0.4.1
[INFO] [stderr]    Compiling codegen v0.1.1
[INFO] [stderr]     Checking cookie v0.12.0
[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-0.4.1/src/parse.rs:690:71
[INFO] [stderr]     |
[INFO] [stderr] 690 |                         *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" "169d7fed66cb89a3d6cc60b5273dc201674471a461cce46c45a4c270d4a7dd31"`
[INFO] running `"docker" "rm" "-f" "169d7fed66cb89a3d6cc60b5273dc201674471a461cce46c45a4c270d4a7dd31"`
[INFO] [stdout] 169d7fed66cb89a3d6cc60b5273dc201674471a461cce46c45a4c270d4a7dd31