[INFO] updating cached repository https://github.com/nelhage/feature-in-mod
[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] ceb2d2e6646635f5161c3a99739889e4d0092eef
[INFO] testing nelhage/feature-in-mod against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnelhage%2Ffeature-in-mod" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nelhage/feature-in-mod 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/nelhage/feature-in-mod
[INFO] finished tweaking git repo https://github.com/nelhage/feature-in-mod
[INFO] tweaked toml for git repo https://github.com/nelhage/feature-in-mod written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/nelhage/feature-in-mod 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-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/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] 2c4d9af6e59392d2c05b7bb0dc3f68c1b279b7cdba2db689c94a09f753b17582
[INFO] running `"docker" "start" "-a" "2c4d9af6e59392d2c05b7bb0dc3f68c1b279b7cdba2db689c94a09f753b17582"`
[INFO] [stderr]    Compiling feature-in-mod v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0658]: box pattern syntax is experimental
[INFO] [stderr]  --> src/transform.rs:7:18
[INFO] [stderr]   |
[INFO] [stderr] 7 |         AST::Add(box AST::Add(ll, lr), r) => AST::Add(ll, Box::new(AST::Add(lr, r))),
[INFO] [stderr]   |                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: for more information, see https://github.com/rust-lang/rust/issues/29641
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: could not compile `feature-in-mod`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2c4d9af6e59392d2c05b7bb0dc3f68c1b279b7cdba2db689c94a09f753b17582"`
[INFO] running `"docker" "rm" "-f" "2c4d9af6e59392d2c05b7bb0dc3f68c1b279b7cdba2db689c94a09f753b17582"`
[INFO] [stdout] 2c4d9af6e59392d2c05b7bb0dc3f68c1b279b7cdba2db689c94a09f753b17582