[INFO] updating cached repository jeffrey-xiao/hash-rings-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jeffrey-xiao/hash-rings-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jeffrey-xiao/hash-rings-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/jeffrey-xiao/hash-rings-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jeffrey-xiao/hash-rings-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jeffrey-xiao/hash-rings-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jeffrey-xiao/hash-rings-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jeffrey-xiao/hash-rings-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 59ee8bef06dfca66875176af00ddc7a3bce05256
[INFO] sha for GitHub repo jeffrey-xiao/hash-rings-rs: 59ee8bef06dfca66875176af00ddc7a3bce05256
[INFO] validating manifest of jeffrey-xiao/hash-rings-rs 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 jeffrey-xiao/hash-rings-rs 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 jeffrey-xiao/hash-rings-rs
[INFO] finished frobbing jeffrey-xiao/hash-rings-rs
[INFO] frobbed toml for jeffrey-xiao/hash-rings-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/jeffrey-xiao/hash-rings-rs/Cargo.toml
[INFO] started frobbing jeffrey-xiao/hash-rings-rs
[INFO] finished frobbing jeffrey-xiao/hash-rings-rs
[INFO] frobbed toml for jeffrey-xiao/hash-rings-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jeffrey-xiao/hash-rings-rs/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing jeffrey-xiao/hash-rings-rs against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jeffrey-xiao/hash-rings-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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 6a3284a42c7c8bc411bd06092eaa5531c7128cb182545dbda1885642ba003bc7
[INFO] running `"docker" "start" "-a" "6a3284a42c7c8bc411bd06092eaa5531c7128cb182545dbda1885642ba003bc7"`
[INFO] [stderr]    Compiling hamming v0.1.3
[INFO] [stderr]    Compiling primal-estimate v0.2.1
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling primal-bit v0.2.4
[INFO] [stderr]    Compiling primal-sieve v0.2.9
[INFO] [stderr]    Compiling primal-check v0.2.3
[INFO] [stderr]    Compiling primal v0.2.3
[INFO] [stderr]    Compiling hash-rings v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0283]: type annotations required: cannot resolve `std::boxed::Box<std::iter::Map<std::collections::hash_map::Iter<'_, &T, std::collections::HashSet<&U>>, [closure@src/weighted_rendezvous.rs:483:40: 486:10]>>: std::iter::Iterator`
[INFO] [stderr]    --> src/weighted_rendezvous.rs:482:30
[INFO] [stderr]     |
[INFO] [stderr] 482 |     pub fn iter(&'a self) -> impl Iterator<Item = (&'a T, Vec<&'a U>)> {
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: the return type of a function must have a statically known size
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0283`.
[INFO] [stderr] error: Could not compile `hash-rings`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "6a3284a42c7c8bc411bd06092eaa5531c7128cb182545dbda1885642ba003bc7"`
[INFO] running `"docker" "rm" "-f" "6a3284a42c7c8bc411bd06092eaa5531c7128cb182545dbda1885642ba003bc7"`
[INFO] [stdout] 6a3284a42c7c8bc411bd06092eaa5531c7128cb182545dbda1885642ba003bc7