[INFO] crate yaserde 0.3.7 is already in cache
[INFO] checking yaserde-0.3.7 against try#1a608893c03d7722effeb0058e82770bd36b4b3c for pr-66504-1
[INFO] extracting crate yaserde 0.3.7 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate yaserde 0.3.7 on toolchain 1a608893c03d7722effeb0058e82770bd36b4b3c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1a608893c03d7722effeb0058e82770bd36b4b3c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate yaserde 0.3.7
[INFO] finished tweaking crates.io crate yaserde 0.3.7
[INFO] tweaked toml for crates.io crate yaserde 0.3.7 written to /workspace/builds/worker-0/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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 59930db29319036b5848a67887069c44dc64c2f83c824c00e515066edb165322
[INFO] running `"docker" "start" "-a" "59930db29319036b5848a67887069c44dc64c2f83c824c00e515066edb165322"`
[INFO] [stderr]     Checking yaserde v0.3.7 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling yaserde_derive v0.3.8
[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/yaserde_derive-0.3.8/src/ser/expand_enum.rs:27:22
[INFO] [stderr]    |
[INFO] [stderr] 27 |         prefix + ":" + renamed_label.to_string().as_ref()
[INFO] [stderr]    |                      ^
[INFO] [stderr] 
[INFO] [stderr] error[E0282]: type annotations needed
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/yaserde_derive-0.3.8/src/ser/expand_struct.rs:33:22
[INFO] [stderr]    |
[INFO] [stderr] 33 |         prefix + ":" + renamed_label.to_string().as_ref()
[INFO] [stderr]    |                      ^ cannot infer type
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0282, E0284.
[INFO] [stderr] For more information about an error, try `rustc --explain E0282`.
[INFO] [stderr] error: could not compile `yaserde_derive`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "59930db29319036b5848a67887069c44dc64c2f83c824c00e515066edb165322"`
[INFO] running `"docker" "rm" "-f" "59930db29319036b5848a67887069c44dc64c2f83c824c00e515066edb165322"`
[INFO] [stdout] 59930db29319036b5848a67887069c44dc64c2f83c824c00e515066edb165322