[INFO] updating cached repository https://github.com/rxs3072/RustExamples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8f897bc2c35051a8be73a48abc0d9c03bf9be3a8
[INFO] testing rxs3072/RustExamples against try#03a1ea71b075ab964b5278bc6e74cd6c52c36ee0 for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frxs3072%2FRustExamples" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rxs3072/RustExamples on toolchain 03a1ea71b075ab964b5278bc6e74cd6c52c36ee0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rxs3072/RustExamples
[INFO] finished tweaking git repo https://github.com/rxs3072/RustExamples
[INFO] tweaked toml for git repo https://github.com/rxs3072/RustExamples written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/rxs3072/RustExamples already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-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@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 19eaa08287eaa2f43f306d068fbc0e13516f4f22d0dc84548bdf74de97e96923
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "19eaa08287eaa2f43f306d068fbc0e13516f4f22d0dc84548bdf74de97e96923", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19eaa08287eaa2f43f306d068fbc0e13516f4f22d0dc84548bdf74de97e96923", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19eaa08287eaa2f43f306d068fbc0e13516f4f22d0dc84548bdf74de97e96923", kill_on_drop: false }`
[INFO] [stdout] 19eaa08287eaa2f43f306d068fbc0e13516f4f22d0dc84548bdf74de97e96923
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 730dbea2298f8e6527b6da188183a2c263d08cd5729c88a4b8b841de19091643
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "730dbea2298f8e6527b6da188183a2c263d08cd5729c88a4b8b841de19091643", kill_on_drop: false }`
[INFO] [stderr]    Compiling car v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:73:22
[INFO] [stdout]    |
[INFO] [stdout] 73 | _=>Some(List::Cons(u,v.removeFirst(s)))
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^ expected struct `std::boxed::Box`, found enum `std::option::Option`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected struct `std::boxed::Box<List<T>>`
[INFO] [stdout]                 found enum `std::option::Option<List<T>>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `car`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "730dbea2298f8e6527b6da188183a2c263d08cd5729c88a4b8b841de19091643", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "730dbea2298f8e6527b6da188183a2c263d08cd5729c88a4b8b841de19091643", kill_on_drop: false }`
[INFO] [stdout] 730dbea2298f8e6527b6da188183a2c263d08cd5729c88a4b8b841de19091643