[INFO] updating cached repository techlunacy/twitter-markov-trender
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/techlunacy/twitter-markov-trender
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/techlunacy/twitter-markov-trender" "work/ex/beta-1.38-1/sources/1.37.0/gh/techlunacy/twitter-markov-trender"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/techlunacy/twitter-markov-trender'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/techlunacy/twitter-markov-trender" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/techlunacy/twitter-markov-trender"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/techlunacy/twitter-markov-trender'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5e8d6e2cb43bca5386972ca5e95272f4e0bcffdc
[INFO] sha for GitHub repo techlunacy/twitter-markov-trender: 5e8d6e2cb43bca5386972ca5e95272f4e0bcffdc
[INFO] validating manifest of techlunacy/twitter-markov-trender on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of techlunacy/twitter-markov-trender on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing techlunacy/twitter-markov-trender
[INFO] finished frobbing techlunacy/twitter-markov-trender
[INFO] frobbed toml for techlunacy/twitter-markov-trender written to work/ex/beta-1.38-1/sources/1.37.0/gh/techlunacy/twitter-markov-trender/Cargo.toml
[INFO] started frobbing techlunacy/twitter-markov-trender
[INFO] finished frobbing techlunacy/twitter-markov-trender
[INFO] frobbed toml for techlunacy/twitter-markov-trender written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/techlunacy/twitter-markov-trender/Cargo.toml
[INFO] crate techlunacy/twitter-markov-trender already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing techlunacy/twitter-markov-trender against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/techlunacy/twitter-markov-trender:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 65cd228ae5ec303a7ffd1f15b8c3ced8e73716004f3b5e2fb0bbf412cc57dcc1
[INFO] running `"docker" "start" "-a" "65cd228ae5ec303a7ffd1f15b8c3ced8e73716004f3b5e2fb0bbf412cc57dcc1"`
[INFO] [stderr]    Compiling twitter_markov_trender v0.0.1 (/opt/crater/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] running `"docker" "inspect" "65cd228ae5ec303a7ffd1f15b8c3ced8e73716004f3b5e2fb0bbf412cc57dcc1"`
[INFO] running `"docker" "rm" "-f" "65cd228ae5ec303a7ffd1f15b8c3ced8e73716004f3b5e2fb0bbf412cc57dcc1"`
[INFO] [stdout] 65cd228ae5ec303a7ffd1f15b8c3ced8e73716004f3b5e2fb0bbf412cc57dcc1