[INFO] updating cached repository willcassella/rusterizer
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/willcassella/rusterizer
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/willcassella/rusterizer" "work/ex/beta-1.38-1/sources/1.37.0/gh/willcassella/rusterizer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/willcassella/rusterizer'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/willcassella/rusterizer" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/willcassella/rusterizer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/willcassella/rusterizer'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d8b955f206471f613357c82db394ea7410ddaa59
[INFO] sha for GitHub repo willcassella/rusterizer: d8b955f206471f613357c82db394ea7410ddaa59
[INFO] validating manifest of willcassella/rusterizer 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 willcassella/rusterizer 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 willcassella/rusterizer
[INFO] finished frobbing willcassella/rusterizer
[INFO] frobbed toml for willcassella/rusterizer written to work/ex/beta-1.38-1/sources/1.37.0/gh/willcassella/rusterizer/Cargo.toml
[INFO] started frobbing willcassella/rusterizer
[INFO] finished frobbing willcassella/rusterizer
[INFO] frobbed toml for willcassella/rusterizer written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/willcassella/rusterizer/Cargo.toml
[INFO] crate willcassella/rusterizer already has a lockfile, it will not be regenerated
[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] testing willcassella/rusterizer 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-7/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/willcassella/rusterizer:/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] 75bfb363a1e20bd137f7f82e99bda0936fa46d16b259ead241156d71a3c2168b
[INFO] running `"docker" "start" "-a" "75bfb363a1e20bd137f7f82e99bda0936fa46d16b259ead241156d71a3c2168b"`
[INFO] [stderr]    Compiling num-integer v0.1.36
[INFO] [stderr]    Compiling deflate v0.7.17
[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 rayon v1.0.1
[INFO] [stderr]    Compiling png v0.11.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.14
[INFO] [stderr]    Compiling image v0.18.0
[INFO] [stderr]    Compiling rusterizer v0.1.0 (/opt/crater/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" "75bfb363a1e20bd137f7f82e99bda0936fa46d16b259ead241156d71a3c2168b"`
[INFO] running `"docker" "rm" "-f" "75bfb363a1e20bd137f7f82e99bda0936fa46d16b259ead241156d71a3c2168b"`
[INFO] [stdout] 75bfb363a1e20bd137f7f82e99bda0936fa46d16b259ead241156d71a3c2168b