[INFO] crate evcxr 0.4.5 is already in cache
[INFO] checking evcxr-0.4.5 against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] extracting crate evcxr 0.4.5 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate evcxr 0.4.5 on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate evcxr 0.4.5
[INFO] finished tweaking crates.io crate evcxr 0.4.5
[INFO] tweaked toml for crates.io crate evcxr 0.4.5 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate evcxr 0.4.5 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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] a7acbf8ffe66beb78fedc9f48a74a79de0bb31c3c8fa3ab2e72915a2b067c585
[INFO] running `"docker" "start" "-a" "a7acbf8ffe66beb78fedc9f48a74a79de0bb31c3c8fa3ab2e72915a2b067c585"`
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]     Checking getrandom v0.1.12
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking sig v1.0.0
[INFO] [stderr]     Checking backtrace v0.3.37
[INFO] [stderr]     Checking syn v0.15.44
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking which v2.0.1
[INFO] [stderr]     Checking evcxr v0.4.5 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0277]: cannot add `&std::borrow::Cow<'_, str>` to `std::string::String`
[INFO] [stderr]   --> src/crate_config.rs:45:25
[INFO] [stderr]    |
[INFO] [stderr] 45 |                         + &path.to_string_lossy()
[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[E0277]: cannot add `&std::borrow::Cow<'_, str>` to `std::string::String`
[INFO] [stderr]   --> src/crate_config.rs:45:25
[INFO] [stderr]    |
[INFO] [stderr] 45 |                         + &path.to_string_lossy()
[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 `evcxr`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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 `evcxr`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a7acbf8ffe66beb78fedc9f48a74a79de0bb31c3c8fa3ab2e72915a2b067c585"`
[INFO] running `"docker" "rm" "-f" "a7acbf8ffe66beb78fedc9f48a74a79de0bb31c3c8fa3ab2e72915a2b067c585"`
[INFO] [stdout] a7acbf8ffe66beb78fedc9f48a74a79de0bb31c3c8fa3ab2e72915a2b067c585