[INFO] updating cached repository linclark/enigma
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/linclark/enigma
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/linclark/enigma" "work/ex/beta-1.37-6/sources/1.36.0/gh/linclark/enigma"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/linclark/enigma'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/linclark/enigma" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/linclark/enigma"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/linclark/enigma'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 14e791b395256951642844d0f2aa572d99bb7f22
[INFO] sha for GitHub repo linclark/enigma: 14e791b395256951642844d0f2aa572d99bb7f22
[INFO] validating manifest of linclark/enigma 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 linclark/enigma 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 linclark/enigma
[INFO] finished frobbing linclark/enigma
[INFO] frobbed toml for linclark/enigma written to work/ex/beta-1.37-6/sources/1.36.0/gh/linclark/enigma/Cargo.toml
[INFO] started frobbing linclark/enigma
[INFO] finished frobbing linclark/enigma
[INFO] frobbed toml for linclark/enigma written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/linclark/enigma/Cargo.toml
[INFO] crate linclark/enigma 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 linclark/enigma 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/linclark/enigma:/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] 63a8adbf4372c5330e92793d06c17363b7506afbfb4be00c8d6ae0bf0f68a41b
[INFO] running `"docker" "start" "-a" "63a8adbf4372c5330e92793d06c17363b7506afbfb4be00c8d6ae0bf0f68a41b"`
[INFO] [stderr]    Compiling either v1.0.2
[INFO] [stderr]    Compiling itertools v0.5.8
[INFO] [stderr]    Compiling ultra v0.3.1 (https://github.com/linclark/ultra#cc71bafb)
[INFO] [stderr] error[E0282]: type annotations needed for `std::vec::Vec<(&str, _)>`
[INFO] [stderr]   --> /opt/crater/cargo-home/git/checkouts/ultra-e470c45dfa05ab13/cc71baf/src/decrypt.rs:26:29
[INFO] [stderr]    |
[INFO] [stderr] 12 |         let mut qgrams = Vec::new();
[INFO] [stderr]    |             ---------- consider giving `qgrams` the explicit type `std::vec::Vec<(&str, _)>`, with the type parameters specified
[INFO] [stderr] ...
[INFO] [stderr] 26 |             let frequency = (n as f64) / (total as f64);
[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 `ultra`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "63a8adbf4372c5330e92793d06c17363b7506afbfb4be00c8d6ae0bf0f68a41b"`
[INFO] running `"docker" "rm" "-f" "63a8adbf4372c5330e92793d06c17363b7506afbfb4be00c8d6ae0bf0f68a41b"`
[INFO] [stdout] 63a8adbf4372c5330e92793d06c17363b7506afbfb4be00c8d6ae0bf0f68a41b