[INFO] updating cached repository autovis/nebra
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/autovis/nebra
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/autovis/nebra" "work/ex/beta-1.38-1/sources/1.37.0/gh/autovis/nebra"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/autovis/nebra'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/autovis/nebra" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/autovis/nebra"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/autovis/nebra'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0fc36d6e74374457a25e8d1dcc2324a12ad6340d
[INFO] sha for GitHub repo autovis/nebra: 0fc36d6e74374457a25e8d1dcc2324a12ad6340d
[INFO] validating manifest of autovis/nebra 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 autovis/nebra 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 autovis/nebra
[INFO] finished frobbing autovis/nebra
[INFO] frobbed toml for autovis/nebra written to work/ex/beta-1.38-1/sources/1.37.0/gh/autovis/nebra/Cargo.toml
[INFO] started frobbing autovis/nebra
[INFO] finished frobbing autovis/nebra
[INFO] frobbed toml for autovis/nebra written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/autovis/nebra/Cargo.toml
[INFO] crate autovis/nebra 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing autovis/nebra 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-4/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/autovis/nebra:/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] 4910228083a772f6fbe9f6a48e790ee931628b0adc95d901cdf6f824d06f346d
[INFO] running `"docker" "start" "-a" "4910228083a772f6fbe9f6a48e790ee931628b0adc95d901cdf6f824d06f346d"`
[INFO] [stderr]    Compiling nebra v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0515]: cannot return value referencing local variable `bor`
[INFO] [stderr]   --> src/stream.rs:93:9
[INFO] [stderr]    |
[INFO] [stderr] 91 |             retval = bor.get_unchecked(((self.index() as usize) - bars_ago) % size);
[INFO] [stderr]    |                      --- `bor` is borrowed here
[INFO] [stderr] 92 |         }
[INFO] [stderr] 93 |         retval
[INFO] [stderr]    |         ^^^^^^ returns a value referencing data owned by the current function
[INFO] [stderr] 
[INFO] [stderr] error[E0596]: cannot borrow data in a dereference of `std::cell::Ref<'_, std::vec::Vec<T>>` as mutable
[INFO] [stderr]   --> src/stream.rs:99:9
[INFO] [stderr]    |
[INFO] [stderr] 99 |         self.buffer.borrow()[idx % size] = value;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
[INFO] [stderr]    |
[INFO] [stderr]    = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::cell::Ref<'_, std::vec::Vec<T>>`
[INFO] [stderr] 
[INFO] [stderr] error[E0596]: cannot borrow data in a dereference of `std::cell::Ref<'_, std::vec::Vec<T>>` as mutable
[INFO] [stderr]    --> src/stream.rs:105:13
[INFO] [stderr]     |
[INFO] [stderr] 105 |             self.buffer.borrow().push(Default::default());
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
[INFO] [stderr]     |
[INFO] [stderr]     = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::cell::Ref<'_, std::vec::Vec<T>>`
[INFO] [stderr] 
[INFO] [stderr] error[E0596]: cannot borrow data in a dereference of `std::cell::Ref<'_, std::vec::Vec<T>>` as mutable
[INFO] [stderr]    --> src/stream.rs:108:13
[INFO] [stderr]     |
[INFO] [stderr] 108 |             self.buffer.borrow()[(self.index.get() as usize) % size] = Default::default();
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable
[INFO] [stderr]     |
[INFO] [stderr]     = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `std::cell::Ref<'_, std::vec::Vec<T>>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0515, E0596.
[INFO] [stderr] For more information about an error, try `rustc --explain E0515`.
[INFO] [stderr] error: Could not compile `nebra`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "4910228083a772f6fbe9f6a48e790ee931628b0adc95d901cdf6f824d06f346d"`
[INFO] running `"docker" "rm" "-f" "4910228083a772f6fbe9f6a48e790ee931628b0adc95d901cdf6f824d06f346d"`
[INFO] [stdout] 4910228083a772f6fbe9f6a48e790ee931628b0adc95d901cdf6f824d06f346d