[INFO] crate log-once 0.3.1 is already in cache
[INFO] checking log-once-0.3.1 against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] extracting crate log-once 0.3.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate log-once 0.3.1 on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate log-once 0.3.1
[INFO] finished tweaking crates.io crate log-once 0.3.1
[INFO] tweaked toml for crates.io crate log-once 0.3.1 written to /workspace/builds/worker-4/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-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] b49c232e3eeb652149053fd2aaac49eeccb369d9ada40bd8678ca8ac2bd24c08
[INFO] running `"docker" "start" "-a" "b49c232e3eeb652149053fd2aaac49eeccb369d9ada40bd8678ca8ac2bd24c08"`
[INFO] [stderr]     Checking log-once v0.3.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0284]: type annotations needed: cannot resolve `<std::string::String as std::ops::Add<&_>>::Output == std::string::String`
[INFO] [stderr]    --> src/lib.rs:101:74
[INFO] [stderr]     |
[INFO] [stderr] 101 |         let event = String::from(stringify!($target)) + stringify!($lvl) + $message.as_ref();
[INFO] [stderr]     |                                                                          ^
[INFO] [stderr] ...
[INFO] [stderr] 244 |         info_once!("Counter is: {}", function());
[INFO] [stderr]     |         ----------------------------------------- in this macro invocation
[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 `log-once`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "b49c232e3eeb652149053fd2aaac49eeccb369d9ada40bd8678ca8ac2bd24c08"`
[INFO] running `"docker" "rm" "-f" "b49c232e3eeb652149053fd2aaac49eeccb369d9ada40bd8678ca8ac2bd24c08"`
[INFO] [stdout] b49c232e3eeb652149053fd2aaac49eeccb369d9ada40bd8678ca8ac2bd24c08