[INFO] updating cached repository https://github.com/techlunacy/twitter-markov-trender
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5e8d6e2cb43bca5386972ca5e95272f4e0bcffdc
[INFO] checking techlunacy/twitter-markov-trender against master#bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc for pr-70917
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftechlunacy%2Ftwitter-markov-trender" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/techlunacy/twitter-markov-trender on toolchain bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/techlunacy/twitter-markov-trender
[INFO] finished tweaking git repo https://github.com/techlunacy/twitter-markov-trender
[INFO] tweaked toml for git repo https://github.com/techlunacy/twitter-markov-trender written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/techlunacy/twitter-markov-trender already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+bf1f2eedda4fa02b7c9347dd849ed73ddd43dedc" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 5868f0164ddc444cca09b6b1a8f71b16fdc8a497adaf6656f838d416ce3f1129
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "5868f0164ddc444cca09b6b1a8f71b16fdc8a497adaf6656f838d416ce3f1129"`
[INFO] [stderr]     Checking twitter_markov_trender v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0282]: type annotations needed
[INFO] [stderr]  --> src/main.rs:6:14
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let keys = chain.iter().flat_map(|s| s.split_whitespace().next()).collect();
[INFO] [stderr]   |         ---- consider giving `keys` a type
[INFO] [stderr] ...
[INFO] [stderr] 6 |     for i in keys.iter() {
[INFO] [stderr]   |              ^^^^ cannot infer type
[INFO] [stderr]   |
[INFO] [stderr]   = note: type must be known at this point
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0282`.
[INFO] [stderr] error: could not compile `twitter_markov_trender`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0282]: type annotations needed
[INFO] [stderr]  --> src/main.rs:6:14
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let keys = chain.iter().flat_map(|s| s.split_whitespace().next()).collect();
[INFO] [stderr]   |         ---- consider giving `keys` a type
[INFO] [stderr] ...
[INFO] [stderr] 6 |     for i in keys.iter() {
[INFO] [stderr]   |              ^^^^ cannot infer type
[INFO] [stderr]   |
[INFO] [stderr]   = note: type must be known at this point
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0282`.
[INFO] [stderr] error: could not compile `twitter_markov_trender`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5868f0164ddc444cca09b6b1a8f71b16fdc8a497adaf6656f838d416ce3f1129"`
[INFO] running `"docker" "rm" "-f" "5868f0164ddc444cca09b6b1a8f71b16fdc8a497adaf6656f838d416ce3f1129"`
[INFO] [stdout] 5868f0164ddc444cca09b6b1a8f71b16fdc8a497adaf6656f838d416ce3f1129
