[INFO] updating cached repository GeertVL/rs-rop-example
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/GeertVL/rs-rop-example
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/GeertVL/rs-rop-example" "work/ex/beta-1.37-6/sources/1.36.0/gh/GeertVL/rs-rop-example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/GeertVL/rs-rop-example'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/GeertVL/rs-rop-example" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/GeertVL/rs-rop-example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/GeertVL/rs-rop-example'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 42d88d225945b5ac4ac31f970967a99470d8e1e1
[INFO] sha for GitHub repo GeertVL/rs-rop-example: 42d88d225945b5ac4ac31f970967a99470d8e1e1
[INFO] validating manifest of GeertVL/rs-rop-example 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 GeertVL/rs-rop-example 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 GeertVL/rs-rop-example
[INFO] finished frobbing GeertVL/rs-rop-example
[INFO] frobbed toml for GeertVL/rs-rop-example written to work/ex/beta-1.37-6/sources/1.36.0/gh/GeertVL/rs-rop-example/Cargo.toml
[INFO] started frobbing GeertVL/rs-rop-example
[INFO] finished frobbing GeertVL/rs-rop-example
[INFO] frobbed toml for GeertVL/rs-rop-example written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/GeertVL/rs-rop-example/Cargo.toml
[INFO] crate GeertVL/rs-rop-example 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] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing GeertVL/rs-rop-example 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/GeertVL/rs-rop-example:/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] 9385555808b0b6911f23d86e53eca98fee7f17da8fb7d33c77f0d2864709df60
[INFO] running `"docker" "start" "-a" "9385555808b0b6911f23d86e53eca98fee7f17da8fb7d33c77f0d2864709df60"`
[INFO] [stderr]    Compiling RsRopExample v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/rop/utils.rs:15:24
[INFO] [stderr]    |
[INFO] [stderr] 15 |     RopResult::Failure(Option::Some(vec![msg]))
[INFO] [stderr]    |                        ^^^^^^^^^^^^^^^^^^^^^^^ expected struct `std::vec::Vec`, found enum `std::option::Option`
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected type `std::vec::Vec<_>`
[INFO] [stderr]               found type `std::option::Option<std::vec::Vec<_>>`
[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 `RsRopExample`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9385555808b0b6911f23d86e53eca98fee7f17da8fb7d33c77f0d2864709df60"`
[INFO] running `"docker" "rm" "-f" "9385555808b0b6911f23d86e53eca98fee7f17da8fb7d33c77f0d2864709df60"`
[INFO] [stdout] 9385555808b0b6911f23d86e53eca98fee7f17da8fb7d33c77f0d2864709df60