[INFO] updating cached repository https://github.com/willcassella/rusterizer
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d8b955f206471f613357c82db394ea7410ddaa59
[INFO] testing willcassella/rusterizer against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwillcassella%2Frusterizer" "work/builds/worker-3/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/willcassella/rusterizer on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/willcassella/rusterizer
[INFO] finished tweaking git repo https://github.com/willcassella/rusterizer
[INFO] tweaked toml for git repo https://github.com/willcassella/rusterizer written to work/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/willcassella/rusterizer already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] c1a835404a4e9d2c69e57935d0f7c00333d1af851e80b986a162ae1f0956404f
[INFO] running `"docker" "start" "-a" "c1a835404a4e9d2c69e57935d0f7c00333d1af851e80b986a162ae1f0956404f"`
[INFO] [stderr]    Compiling num-traits v0.2.1
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling num-integer v0.1.36
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[INFO] [stderr]    Compiling num-iter v0.1.35
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling png v0.11.0
[INFO] [stderr]    Compiling rayon v1.0.1
[INFO] [stderr]    Compiling jpeg-decoder v0.1.14
[INFO] [stderr]    Compiling image v0.18.0
[INFO] [stderr]    Compiling rusterizer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/strider/mod.rs:41:27
[INFO] [stderr]    |
[INFO] [stderr] 41 |     fn next(&mut self) -> Option<Self::Item> {
[INFO] [stderr]    |        ----               ^^^^^^^^^^^^^^^^^^ expected enum `std::option::Option`, found ()
[INFO] [stderr]    |        |
[INFO] [stderr]    |        implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected type `std::option::Option<<Types as strider::detail::type_tuple::StriderTypeTuple<'_>>::References>`
[INFO] [stderr]               found type `()`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0308`.
[INFO] [stderr] error: could not compile `rusterizer`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c1a835404a4e9d2c69e57935d0f7c00333d1af851e80b986a162ae1f0956404f"`
[INFO] running `"docker" "rm" "-f" "c1a835404a4e9d2c69e57935d0f7c00333d1af851e80b986a162ae1f0956404f"`
[INFO] [stdout] c1a835404a4e9d2c69e57935d0f7c00333d1af851e80b986a162ae1f0956404f