[INFO] updating cached repository lrlna/ramen-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/lrlna/ramen-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/lrlna/ramen-rs" "work/ex/beta-1.37-6/sources/1.36.0/gh/lrlna/ramen-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/lrlna/ramen-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/lrlna/ramen-rs" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/lrlna/ramen-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/lrlna/ramen-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9d897faac2bc8568ccc3d8b31945223549a5f395
[INFO] sha for GitHub repo lrlna/ramen-rs: 9d897faac2bc8568ccc3d8b31945223549a5f395
[INFO] validating manifest of lrlna/ramen-rs on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of lrlna/ramen-rs on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing lrlna/ramen-rs
[INFO] finished frobbing lrlna/ramen-rs
[INFO] frobbed toml for lrlna/ramen-rs written to work/ex/beta-1.37-6/sources/1.36.0/gh/lrlna/ramen-rs/Cargo.toml
[INFO] started frobbing lrlna/ramen-rs
[INFO] finished frobbing lrlna/ramen-rs
[INFO] frobbed toml for lrlna/ramen-rs written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/lrlna/ramen-rs/Cargo.toml
[INFO] crate lrlna/ramen-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing lrlna/ramen-rs against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/lrlna/ramen-rs:/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] f6ff51be13e94d7d5567064f047fdadd906df84397ae28b962f5340bc2c032f7
[INFO] running `"docker" "start" "-a" "f6ff51be13e94d7d5567064f047fdadd906df84397ae28b962f5340bc2c032f7"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.8
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling serde_json v1.0.24
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling chrono v0.4.4
[INFO] [stderr]    Compiling quote v0.6.3
[INFO] [stderr]    Compiling syn v0.14.4
[INFO] [stderr]    Compiling bson v0.12.2
[INFO] [stderr]    Compiling scan_fmt v0.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.70
[INFO] [stderr]    Compiling textnonce v0.6.4
[INFO] [stderr]    Compiling mongodb v0.3.9
[INFO] [stderr]    Compiling rust-mongodb v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::iter`
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use std::iter;
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: `&Cities` is not an iterator
[INFO] [stderr]   --> src/main.rs:36:27
[INFO] [stderr]    |
[INFO] [stderr] 36 |         for (key, val) in city {
[INFO] [stderr]    |                           ^^^^ `&Cities` is not an iterator
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::iter::Iterator` is not implemented for `&Cities`
[INFO] [stderr]    = note: required by `std::iter::IntoIterator::into_iter`
[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 `rust-mongodb`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f6ff51be13e94d7d5567064f047fdadd906df84397ae28b962f5340bc2c032f7"`
[INFO] running `"docker" "rm" "-f" "f6ff51be13e94d7d5567064f047fdadd906df84397ae28b962f5340bc2c032f7"`
[INFO] [stdout] f6ff51be13e94d7d5567064f047fdadd906df84397ae28b962f5340bc2c032f7