[INFO] crate hash-rings 1.0.0 is already in cache
[INFO] extracting crate hash-rings 1.0.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/hash-rings/1.0.0
[INFO] extracting crate hash-rings 1.0.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/hash-rings/1.0.0
[INFO] validating manifest of hash-rings-1.0.0 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 hash-rings-1.0.0 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 hash-rings-1.0.0
[INFO] finished frobbing hash-rings-1.0.0
[INFO] frobbed toml for hash-rings-1.0.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/hash-rings/1.0.0/Cargo.toml
[INFO] started frobbing hash-rings-1.0.0
[INFO] finished frobbing hash-rings-1.0.0
[INFO] frobbed toml for hash-rings-1.0.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/hash-rings/1.0.0/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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[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" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing hash-rings-1.0.0 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-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/hash-rings/1.0.0:/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] 760c2d0ac70e90e9a44fb6bac11e373e813f1e062cefc58a7b69febc9aadfa06
[INFO] running `"docker" "start" "-a" "760c2d0ac70e90e9a44fb6bac11e373e813f1e062cefc58a7b69febc9aadfa06"`
[INFO] [stderr]    Compiling hash-rings v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/carp.rs:276:25
[INFO] [stderr]     |
[INFO] [stderr] 276 |     type IntoIter = Box<Iterator<Item = (&'a T, f64)> + 'a>;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&'a T, f64)> + 'a`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/consistent.rs:224:25
[INFO] [stderr]     |
[INFO] [stderr] 224 |     type IntoIter = Box<Iterator<Item = (&'a T, usize)> + 'a>;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&'a T, usize)> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/consistent.rs:543:25
[INFO] [stderr]     |
[INFO] [stderr] 543 |     type IntoIter = Box<Iterator<Item = (&'a T, Vec<&'a U>)> + 'a>;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&'a T, Vec<&'a U>)> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/maglev.rs:203:25
[INFO] [stderr]     |
[INFO] [stderr] 203 |     type IntoIter = Box<Iterator<Item = &'a T> + 'a>;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &'a T> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/mpc.rs:232:25
[INFO] [stderr]     |
[INFO] [stderr] 232 |     type IntoIter = Box<Iterator<Item = &'a T> + 'a>;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &'a T> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/rendezvous.rs:203:25
[INFO] [stderr]     |
[INFO] [stderr] 203 |     type IntoIter = Box<Iterator<Item = (&'a T, usize)> + 'a>;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&'a T, usize)> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/rendezvous.rs:517:25
[INFO] [stderr]     |
[INFO] [stderr] 517 |     type IntoIter = Box<Iterator<Item = (&'a T, Vec<&'a U>)> + 'a>;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&'a T, Vec<&'a U>)> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/weighted_rendezvous.rs:197:25
[INFO] [stderr]     |
[INFO] [stderr] 197 |     type IntoIter = Box<Iterator<Item = (&'a T, f64)> + 'a>;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&'a T, f64)> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/weighted_rendezvous.rs:502:25
[INFO] [stderr]     |
[INFO] [stderr] 502 |     type IntoIter = Box<Iterator<Item = (&'a T, Vec<&'a U>)> + 'a>;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = (&'a T, Vec<&'a U>)> + 'a`
[INFO] [stderr] 
[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:490:40: 493:10]>>: std::iter::Iterator`
[INFO] [stderr]    --> src/weighted_rendezvous.rs:489:30
[INFO] [stderr]     |
[INFO] [stderr] 489 |     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" "760c2d0ac70e90e9a44fb6bac11e373e813f1e062cefc58a7b69febc9aadfa06"`
[INFO] running `"docker" "rm" "-f" "760c2d0ac70e90e9a44fb6bac11e373e813f1e062cefc58a7b69febc9aadfa06"`
[INFO] [stdout] 760c2d0ac70e90e9a44fb6bac11e373e813f1e062cefc58a7b69febc9aadfa06